Buprenorphine Sublingual Tablets is indicated for the treatment of opioid dependence and is preferred for induction. Buprenorphine Sublingual Tablets should be used as part of a complete treatment plan to include counseling and psychosocial support. Under the Drug Addiction Treatment Act (DATA) codified at 21 U.S.C. 823(g), prescription use of this product in the treatment of opioid dependence is limited to physic...
Dosage and administration
Buprenorphine Sublingual Tablets is administered sublingually as a single daily dose. Buprenorphine Sublingual Tablets contain no naloxone HCL and is preferred for use only during induction. Following induction, Buprenorphine and Naloxone Sublingual Film or Buprenorphine and Naloxone Sublingual Tablets is preferred due to the presence of naloxone when clinical use includes unsupervised administration. The use of B...
Storage and handling
Buprenorphine Sublingual Tablets are supplied in white HDPE bottles. 2 mg - White, round, biconvex uncoated tablets with "2" debossed on one side and a dart "→" debossed on the other side NDC 50383-924-93 30 tablets per bottle 8 mg - White, round, biconvex uncoated tablets with "8" debossed on one side and a dart "→" debossed on the other side NDC 50383-930-93 30 tablets per bottle Storage Store at 25°C (77°F), ...
Buprenorphine Sublingual Tablets is indicated for the treatment of opioid dependence and is preferred for induction. Buprenorphine Sublingual Tablets should be used as part of a complete treatment plan to include counseling and psychosocial support.
Under the Drug Addiction Treatment Act (DATA)
codified at 21 U.S.C. 823(g), prescription use of this product in
the treatment of opioid dependence is limited to physicians who meet
certain qualifying requirements, and who have notified the Secretary
of Health and Human Services (HHS) of their intent to prescribe this
product for the treatment of opioid dependence and have been
assigned a unique identification number that must be included on
every prescription.
2 DOSAGE AND ADMINISTRATION
DOSAGE & ADMINISTRATION SECTION
Buprenorphine Sublingual Tablets is administered sublingually as a single daily dose. Buprenorphine Sublingual Tablets contain no naloxone HCL and is preferred for use only during induction. Following induction, Buprenorphine and Naloxone Sublingual Film or Buprenorphine and Naloxone Sublingual Tablets is preferred due to the presence of naloxone when clinical use includes unsupervised administration. The use of Buprenorphine Sublingual Tablets for unsupervised administration should be limited to those patients who cannot tolerate Buprenorphine and Naloxone Sublingual Film or Buprenorphine and Naloxone Sublingual Tablets; for example, those patients who have been shown to be hypersensitive to naloxone.
Medication should be prescribed in consideration of the frequency
of visits. Provision of multiple refills is not advised early in
treatment or without appropriate patient follow-up visits.
2.1 Induction
SPL UNCLASSIFIED SECTION
Prior to induction, consideration should be given to the type of opioid dependence (i.e. long- or short-acting opioid), the time since last opioid use, and the degree or level of opioid dependence. To avoid precipitating withdrawal, induction with Buprenorphine Sublingual Tablets should be undertaken when objective and clear signs of withdrawal are evident.
It is recommended that an adequate treatment dose, titrated to clinical effectiveness, should be achieved as rapidly as possible. In a one-month study, patients received 8 mg of Buprenorphine Sublingual Tablets on Day 1 and 16 mg Buprenorphine Sublingual Tablets on Day 2. From Day 3 onward, patients received either buprenorphine and naloxone sublingual tablet or Buprenorphine Sublingual Tablets at the same buprenorphine dose as Day 2 based on their assigned treatment. Induction in the studies of buprenorphine solution was accomplished over 3 to 4 days, depending on the target dose. In some studies, gradual induction over several days led to a high rate of drop-out of buprenorphine patients during the induction period.
SPL UNCLASSIFIED SECTION
Patients taking
heroin or other short-acting opioids: At
treatment initiation, the dose of Buprenorphine Sublingual Tablets should be administered at least 4
hours after the patient last used opioids or preferably
when moderate objective signs of opioid withdrawal
appear.
SPL UNCLASSIFIED SECTION
Patients on
methadone or other long-acting opioids:
There is little controlled experience with the
transfer of methadone-maintained patients to
buprenorphine. Available evidence suggests that
withdrawal signs and symptoms are possible during
induction onto buprenorphine. Withdrawal appears more
likely in patients maintained on higher doses of
methadone (greater than 30 mg) and when the first
buprenorphine dose is administered shortly after the
last methadone dose. Buprenorphine Sublingual Tablets
dosing should be initiated preferably when moderate
objective signs of opioid withdrawal appear.
2.2 Maintenance
SPL UNCLASSIFIED SECTION
Buprenorphine and naloxone is preferred for
maintenance treatment.
Where buprenorphine is used in
maintenance in patients who cannot tolerate the presence of
naloxone, the dosage of buprenorphine should be progressively adjusted in increments / decrements
of 2 mg or 4 mg buprenorphine to a level that holds the
patient in treatment and suppresses opioid withdrawal signs
and symptoms.
The maintenance dose is generally in the range of 4 mg to
24 mg buprenorphine per day depending on the individual
patient.
Doses higher than this have not been
demonstrated to provide any clinical advantage.
2.3 Method of Administration
SPL UNCLASSIFIED SECTION
Buprenorphine Sublingual Tablets should be placed
under the tongue until it is dissolved. For doses requiring the
use of more than two tablets, patients are advised to either
place all the tablets at once or alternatively (if they cannot
fit in more than two tablets comfortably), place two tablets at
a time under the tongue. Either way, the patients should
continue to hold the tablets under the tongue until they
dissolve; swallowing the tablets reduces the bioavailability of
the drug. To ensure consistency in bioavailability, patients
should follow the same manner of dosing with continued use of
the product.
Proper administration technique should
be demonstrated to the patient.
2.4 Clinical Supervision
SPL UNCLASSIFIED SECTION
Treatment should be initiated with supervised administration, progressing to unsupervised administration as the patient's clinical stability permits. The use of buprenorphine for unsupervised administration should be limited to those patients who cannot tolerate buprenorphine and naloxone, for example those patients with known hypersensitivity to naloxone. Buprenorphine and naloxone and buprenorphine are both subject to diversion and abuse. When determining the size of the prescription quantity for unsupervised administration, consider the patient's level of stability, the security of his or her home situation, and other factors likely to affect the ability of the patient to manage supplies of take-home medication.
Ideally, patients should be seen at reasonable intervals
(e.g., at least weekly during the first month of treatment)
based upon the individual circumstances of the patient.
Medication should be prescribed in consideration of the
frequency of visits. Provision of multiple refills is not
advised early in treatment or without appropriate patient
follow-up visits. Periodic assessment is necessary to determine
compliance with the dosing regimen, effectiveness of the
treatment plan, and overall patient progress.
Once a stable dosage has been achieved and patient
assessment (e.g., urine drug screening) does not indicate
illicit drug use, less frequent follow-up visits may be
appropriate. A once-monthly visit schedule may be reasonable for
patients on a stable dosage of medication who are making
progress toward their treatment objectives. Continuation or
modification of pharmacotherapy should be based on the
physician's evaluation of treatment outcomes and
objectives such as:
Absence of medication toxicity.
Absence of medical or behavioral adverse effects.
Responsible handling of medications by the patient.
Patient's compliance with all elements of the
treatment plan (including recovery-oriented activities,
psychotherapy, and/or other psychosocial modalities).
Abstinence from illicit drug use (including problematic
alcohol and/or benzodiazepine use).
If treatment goals are not being achieved, the physician
should re-evaluate the appropriateness of continuing the current
treatment.
2.5 Patients With Hepatic Impairment
SPL UNCLASSIFIED SECTION
Severe hepatic impairment: Consider reducing the starting
and titration incremental dose by half compared to patients with
normal liver function, and monitor for signs and symptoms of
toxicity or overdose caused by increased levels of
buprenorphine.
Moderate hepatic impairment: Although no dose adjustment is necessary for patients with moderate hepatic impairment, Buprenorphine Sublingual Tablets should be used with caution in these patients and prescribers should monitor patients for signs and symptoms of toxicity or overdose caused by increased levels of buprenorphine.
Mild hepatic impairment: No clinically significant
differences in pharmacokinetic parameters were observed in
subjects with mild hepatic impairment. No dose adjustment is
needed in patients with mild hepatic impairment.
[see Warnings and Precautions (
5.11)]
.
2.6 Unstable Patients
SPL UNCLASSIFIED SECTION
Physicians will need to decide when they cannot
appropriately provide further management for particular
patients. For example, some patients may be abusing or dependent
on various drugs, or unresponsive to psychosocial intervention
such that the physician does not feel that he/she has the
expertise to manage the patient. In such cases, the physician
may want to assess whether to refer the patient to a specialist
or more intensive behavioral treatment environment. Decisions
should be based on a treatment plan established and agreed upon
with the patient at the beginning of treatment.
Patients who continue to misuse, abuse, or divert
buprenorphine products or other opioids should be provided with,
or referred to, more intensive and structured
treatment.
2.7 Stopping Treatment
SPL UNCLASSIFIED SECTION
The decision to discontinue therapy with buprenorphine
and naloxone or buprenorphine after a
period of maintenance should be made as part of a comprehensive
treatment plan. Both gradual and abrupt discontinuation of
buprenorphine has been used, but the data are insufficient to
determine the best method of dose taper at the end of
treatment.
3 DOSAGE FORMS AND STRENGTHS
DOSAGE FORMS & STRENGTHS SECTION
Buprenorphine Sublingual Tablets is supplied as white, sublingual tablets available in two dosage strengths:
buprenorphine 2 mg, and
buprenorphine 8 mg
4 CONTRAINDICATIONS
CONTRAINDICATIONS SECTION
Buprenorphine Sublingual Tablets should not be administered to patients who have been shown to be hypersensitive to buprenorphine, as serious adverse reactions, including anaphylactic shock, have been reported.
[see Warnings and Precautions
(
5.8)].
5 WARNINGS AND PRECAUTIONS
WARNINGS AND PRECAUTIONS SECTION
5.1 Abuse Potential
SPL UNCLASSIFIED SECTION
Buprenorphine can be abused in a manner similar to other
opioids, legal or illicit. Prescribe and dispense buprenorphine
with appropriate precautions to minimize risk of misuse, abuse,
or diversion, and ensure appropriate protection from theft,
including in the home. Clinical monitoring appropriate to the
patient's level of stability is essential. Multiple
refills should not be prescribed early in treatment or without
appropriate patient follow-up visits.
[see Drug Abuse and Dependence
(
9.2)].
5.2 Respiratory Depression
SPL UNCLASSIFIED SECTION
Buprenorphine, particularly when taken by the IV route,
in combination with benzodiazepines or other CNS depressants
(including alcohol), has been associated with significant
respiratory depression and death. Many, but not all
post-marketing reports regarding coma and death associated with
the concomitant use of buprenorphine and benzodiazepines
involved misuse by self-injection. Deaths have also been
reported in association with concomitant administration of
buprenorphine with other depressants such as alcohol or other
CNS depressant drugs. Patients should be warned of the potential
danger of self-administration of benzodiazepines or other
depressants while under treatment with Buprenorphine Sublingual Tablets.
[see Drug
Interactions (
7.3)].
In the case of overdose, the primary
management should be the re-establishment of adequate
ventilation with mechanical assistance of respiration, if
required. Naloxone may be of value for the management of
buprenorphine overdose. Higher than normal doses and
repeated administration may be necessary.
Buprenorphine Sublingual Tablets should be used with
caution in patients with compromised respiratory function (e.g.,
chronic obstructive pulmonary disease, cor pulmonale, decreased
respiratory reserve, hypoxia, hypercapnia, or pre-existing
respiratory depression).
5.3 CNS Depression
SPL UNCLASSIFIED SECTION
Patients receiving buprenorphine in the presence of
opioid analgesics, general anesthetics, benzodiazepines,
phenothiazines, other tranquilizers, sedative/hypnotics or other
CNS depressants (including alcohol) may exhibit increased CNS
depression. Consider dose reduction of CNS depressants,
Buprenorphine Sublingual Tablets, or both in situations of
concomitant prescription.
[see Drug
Interactions (
7.3)].
5.4 Unintentional Pediatric Exposure
SPL UNCLASSIFIED SECTION
Buprenorphine can cause severe, possibly fatal,
respiratory depression in children who are accidentally exposed
to it. Store buprenorphine-containing medications safely out of
the sight and reach of children and destroy any unused
medication appropriately
. [see
Patient Counseling (
17)].
5.5 Neonatal Opioid Withdrawal Syndrome
SPL UNCLASSIFIED SECTION
Neonatal opioid withdrawal syndrome (NOWS) is an expected and treatable outcome of prolonged use of opioids during pregnancy, whether that use is medically-authorized or illicit. Unlike opioid withdrawal syndrome in adults, NOWS may be life-threatening if not recognized and treated in the neonate. Healthcare professionals should observe newborns for signs of NOWS and manage accordingly [
see Use in Specific Populations (
8.1)].
Advise pregnant women receiving opioid addiction treatment with Buprenorphine Sublingual Tablets of the risk of neonatal opioid withdrawal syndrome and ensure that appropriate treatment will be available [
see Use in Specific Populations (
8.1)]. This risk must be balanced against the risk of untreated opioid addiction which often results in continued or relapsing illicit opioid use and is associated with poor pregnancy outcomes. Therefore, prescribers should discuss the importance and benefits of management of opioid addiction throughout pregnancy.
5.6 Adrenal Insufficiency
SPL UNCLASSIFIED SECTION
Cases of adrenal insufficiency have been reported with opioid use, more often following greater than one month of use. Presentation of adrenal insufficiency may include non-specific symptoms and signs including nausea, vomiting, anorexia, fatigue, weakness, dizziness, and low blood pressure. If adrenal insufficiency is suspected, confirm the diagnosis with diagnostic testing as soon as possible. If adrenal insufficiency is diagnosed, treat with physiologic replacement doses of corticosteroids. Wean the patient off of the opioid to allow adrenal function to recover and continue corticosteroid treatment until adrenal function recovers. Other opioids may be tried as
some cases reported use of a different opioid without recurrence of adrenal insufficiency. The information available does not identify any particular opioids as being more likely to be associated with adrenal insufficiency.
5.7 Dependence
SPL UNCLASSIFIED SECTION
Buprenorphine is a partial agonist at the mu-opioid receptor and chronic administration produces physical dependence of the opioid type, characterized by withdrawal signs and symptoms upon abrupt discontinuation or rapid taper. The withdrawal syndrome is typically milder than seen with full agonists and may be delayed in onset. Buprenorphine can be abused in a manner similar to other opioids. This should be considered when prescribing or dispensing buprenorphine in situations when the clinician is concerned about an increased risk of misuse, abuse, or diversion.
[see Drug Abuse and Dependence (
9.3)].
5.8 Hepatitis, Hepatic Events
SPL UNCLASSIFIED SECTION
Cases of cytolytic hepatitis and hepatitis with jaundice
have been observed in individuals receiving buprenorphine in
clinical trials and through post-marketing adverse event
reports. The spectrum of abnormalities ranges from transient
asymptomatic elevations in hepatic transaminases to case reports
of death, hepatic failure, hepatic necrosis, hepatorenal
syndrome, and hepatic encephalopathy. In many cases, the
presence of pre-existing liver enzyme abnormalities, infection
with hepatitis B or hepatitis C virus, concomitant usage of
other potentially hepatotoxic drugs, and ongoing injecting drug
use may have played a causative or contributory role. In other
cases, insufficient data were available to determine the
etiology of the abnormality. Withdrawal of buprenorphine has
resulted in amelioration of acute hepatitis in some cases;
however, in other cases no dose reduction was necessary. The
possibility exists that buprenorphine had a causative or
contributory role in the development of the hepatic abnormality
in some cases. Liver function tests, prior to initiation of
treatment is recommended to establish a baseline. Periodic
monitoring of liver function during treatment is also
recommended. A biological and etiological evaluation is
recommended when a hepatic event is suspected. Depending on the
case, Buprenorphine Sublingual Tablets may need to be
carefully discontinued to prevent withdrawal signs and symptoms
and a return by the patient to illicit drug use, and strict
monitoring of the patient should be initiated.
5.9 Allergic Reactions
SPL UNCLASSIFIED SECTION
Cases of hypersensitivity to buprenorphine products have
been reported both in clinical trials and in the post-marketing
experience. Cases of bronchospasm, angioneutrotic edema, and
anaphylactic shock have been reported. The most common signs and
symptoms include rashes, hives, and pruritus. A history of
hypersensitivity to buprenorphine is a contraindication to the
use of Buprenorphine Sublingual Tablets.
5.10 Precipitation of Opioid Withdrawal Signs and Symptoms
SPL UNCLASSIFIED SECTION
Because of the partial agonist properties of
buprenorphine, Buprenorphine Sublingual Tablets may
precipitate opioid withdrawal signs and symptoms in individuals
physically dependent on full opioid agonists if administered
sublingually or parenterally before the agonist effects of other
opioids have subsided.
5.11 Use in Opioid Naïve Patients
SPL UNCLASSIFIED SECTION
There have been reported deaths of opioid naïve
individuals who received a 2 mg dose of buprenorphine as a
sublingual tablet for analgesia. Buprenorphine Sublingual Tablets are not appropriate as an analgesic.
5.12 Use in Patients With Impaired Hepatic Function
SPL UNCLASSIFIED SECTION
In a pharmacokinetic study, buprenorphine plasma levels
were found to be higher and the half-life was found to be longer
in subjects with moderate and severe hepatic impairment, but not
in subjects with mild hepatic impairment.
For patients with severe hepatic impairment, a dose
adjustment is recommended, and patients with moderate or severe
hepatic impairment should be monitored for signs and symptoms of
toxicity or overdose caused by increased levels of
buprenorphine
[see Dosage and
Administration (
2.5) and Use in Specific Populations (
8.6)].
5.13 Impairment of Ability to Drive or Operate Machinery
SPL UNCLASSIFIED SECTION
Buprenorphine Sublingual Tablets may impair the
mental or physical abilities required for the performance of
potentially dangerous tasks such as driving a car or operating
machinery, especially during treatment induction and dose
adjustment. Patients should be cautioned about driving or
operating hazardous machinery until they are reasonably certain
that buprenorphine therapy does not adversely affect his or her
ability to engage in such activities.
5.14 Orthostatic Hypotension
SPL UNCLASSIFIED SECTION
Like other opioids, Buprenorphine Sublingual Tablets
may produce orthostatic hypotension in ambulatory
patients.
5.15 Elevation of Cerebrospinal Fluid Pressure
SPL UNCLASSIFIED SECTION
Buprenorphine, like other opioids, may elevate
cerebrospinal fluid pressure and should be used with caution in
patients with head injury, intracranial lesions and other
circumstances when cerebrospinal pressure may be increased.
Buprenorphine can produce miosis and changes in the level of
consciousness that may interfere with patient
evaluation.
5.16 Elevation of Intracholedochal Pressure
SPL UNCLASSIFIED SECTION
Buprenorphine has been shown to increase intracholedochal
pressure, as do other opioids, and thus should be administered
with caution to patients with dysfunction of the biliary
tract.
5.17 Effects in Acute Abdominal Conditions
SPL UNCLASSIFIED SECTION
As with other opioids, buprenorphine may obscure the
diagnosis or clinical course of patients with acute abdominal
conditions.
5.18 General Precautions
SPL UNCLASSIFIED SECTION
Buprenorphine Sublingual Tablets should be
administered with caution in debilitated patients and those with
myxedema or hypothyroidism; adrenal cortical insufficiency
(e.g., Addison's disease); CNS depression or coma;
toxic psychoses; prostatic hypertrophy or urethral stricture;
acute alcoholism; delirium tremens; or
kyphoscoliosis.
6 ADVERSE REACTIONS
ADVERSE REACTIONS SECTION
Because clinical trials are conducted under widely varying
conditions, adverse reaction rates observed in the clinical trials of a
drug cannot be directly compared to rates in the clinical trials of
another drug and may not reflect the rates observed in
practice.
6.1 Adverse Events in Clinical Trials
SPL UNCLASSIFIED SECTION
The safety of Buprenorphine Sublingual Tablets was
supported by clinical trials using Buprenorphine Sublingual Tablets, buprenorphine and naloxone sublingual tablets and other
trials using buprenorphine sublingual solutions. In total,
safety data were available from 3214 opioid-dependent subjects
exposed to buprenorphine at doses in the range used in treatment
of opioid addiction.
Few differences in adverse event profile were noted
between Buprenorphine Sublingual Tablets or buprenorphine
administered as a sublingual solution.
The following adverse events were reported to occur by at
least 5% of patients in a 4-week study (Table 1).
Table 1: Adverse Events ≥5% by Body System and Treatment Group in a 4-week Study
N(%)
N(%)
Body
System /Adverse Event (COSTART Terminology)
Buprenorphine
Sublingual Tablets
16 mg/day
N=103
Placebo
N=107
Body as a Whole
Asthenia
5 (4.9%)
7 (6.5%)
Chills
8 (7.8%)
8 (7.5%)
Headache
30 (29.1%)
24 (22.4%)
Infection
12 (11.7%)
7 (6.5%)
Pain
19 (18.4%)
20 (18.7%)
Pain Abdomen
12 (11.7%)
7 (6.5%)
Pain Back
8 (7.8%)
12 (11.2%)
Withdrawal Syndrome
19 (18.4%)
40 (37.4%)
Cardiovascular System
Vasodilation
4 (3.9%)
7 (6.5%)
Digestive System
Constipation
8 (7.8%)
3 (2.8%)
Diarrhea
5 (4.9%)
16 (15.0%)
Nausea
14 (13.6%)
12 (11.2%)
Vomiting
8 (7.8%)
5 (4.7%)
Nervous System
Insomnia
22 (21.4%)
17 (15.9%)
Respiratory System
Rhinitis
10 (9.7%)
14 (13.1%)
Skin and Appendages
Sweating
13 (12.6%)
11 (10.3%)
The adverse event profile of buprenorphine was also
characterized in the dose-controlled study of buprenorphine
solution, over a range of doses in four months of treatment.
Table 2 shows adverse events reported by at least 5% of subjects
in any dose group in the dose-controlled study.
Table 2: Adverse Events (≥5%) by Body System
and Treatment Group in a 16-week Study
* Sublingual solution. Doses in this table
cannot necessarily be delivered in tablet form, but for comparison
purposes:
"Very low" dose (1 mg solution) would be less
than a tablet dose of 2 mg.
"Low" dose (4 mg solution)
approximates a 6 mg tablet dose.
"Moderate" dose (8 mg
solution) approximates a 12 mg tablet dose.
"High" dose
(16 mg solution) approximates a 24 mg tablet dose.
6.2 Adverse Events - Postmarketing Experience with Buprenorphine Sublingual Tablets
SPL UNCLASSIFIED SECTION
The most frequently reported postmarketing adverse
events with buprenorphine not observed in
clinical trials, excluding drug exposure during pregnancy, was
drug misuse or abuse.
Serotonin syndrome: Cases of serotonin syndrome, a potentially life-threatening condition, have been reported during concomitant use of opioids with serotonergic drugs.
Adrenal insufficiency: Cases of adrenal insufficiency have been reported with opioid use, more often following greater than one month of use.
Anaphylaxis: Anaphylaxis has been reported with ingredients contained in Buprenorphine Sublingual Tablets.
Androgen deficiency: Cases of androgen deficiency have occurred with chronic use of opioids
[see Clinical Pharmacology (
12.2)]
.
7 DRUG INTERACTIONS
DRUG INTERACTIONS SECTION
7.1 Cytochrome P-450 3A4 (CYP3A4) Inhibitors and Inducers
SPL UNCLASSIFIED SECTION
Buprenorphine is metabolized to norbuprenorphine
primarily by cytochrome CYP3A4; therefore, potential
interactions may occur when Buprenorphine Sublingual Tablets
is given concurrently with agents that affect CYP3A4 activity.
The concomitant use of Buprenorphine Sublingual Tablets with
CYP3A4 inhibitors (e.g., azole antifungals such as ketoconazole,
macrolide antibiotics such as erythromycin, and HIV protease
inhibitors) should be monitored and may require dose-reduction
of one or both agents.
The interaction of buprenorphine with many CYP3A4
inducers has not been studied; therefore, it is recommended that
patients receiving Buprenorphine Sublingual Tablets be
monitored for signs and symptoms of opioid withdrawal if
inducers of CYP3A4 (e.g., phenobarbital, carbamazepine,
phenytoin, rifampicin) are co-administered.
[see Clinical Pharmacology (
12.3)].
7.2 Antiretrovirals
SPL UNCLASSIFIED SECTION
Three classes of antiretroviral agents have been
evaluated for CYP3A4 interactions with buprenorphine. Nucleoside
reverse transcriptase inhibitors (NRTIs) do not appear to induce
or inhibit the P450 enzyme pathway, thus no interactions with
buprenorphine are expected. Non-nucleoside reverse transcriptase
inhibitors (NNRTIs) are metabolized principally by CYP3A4.
Efavirenz, nevirapine and etravirine are known CYP3A inducers
whereas delaviridine is a CYP3A inhibitor. Significant
pharmacokinetic interactions between NNRTIs (e.g., efavirenz and
delavirdine) and buprenorphine have been shown in clinical
studies, but these pharmacokinetic interactions did not result
in any significant pharmacodynamic effects. It is recommended
that patients who are on chronic buprenorphine treatment have
their dose monitored if NNRTIs are added to their treatment
regimen. Studies have shown some antiretroviral protease
inhibitors (PIs) with CYP3A4 inhibitory activity (nelfinavir,
lopinavir/ritonavir, ritonavir) have little effect on
buprenorphine pharmacokinetic and no significant pharmacodynamic
effects. Other PIs with CYP3A4 inhibitory activity (atazanavir
and atazanavir/ritonavir) resulted in elevated levels of
buprenorphine and norbuprenorphine and patients in one study
reported increased sedation. Symptoms of opioid excess have been
found in post-marketing reports of patients receiving
buprenorphine and atazanavir with and without ritonavir
concomitantly. Monitoring of patients taking buprenorphine and
atazanavir with and without ritonavir is recommended, and dose
reduction of buprenorphine may be warranted.
7.3 Benzodiazepines
SPL UNCLASSIFIED SECTION
There have been a number of post-marketing reports
regarding coma and death associated with the concomitant use of
buprenorphine and benzodiazepines. In many, but not all, of
these cases, buprenorphine was misused by self-injection.
Preclinical studies have shown that the combination of
benzodiazepines and buprenorphine altered the usual ceiling
effect on buprenorphine-induced respiratory depression, making
the respiratory effects of buprenorphine appear similar to those
of full opioid agonists. Buprenorphine Sublingual Tablets
should be prescribed with caution to patients taking
benzodiazepines or other drugs that act on the CNS, regardless
of whether these drugs are taken on the advice of a physician or
are being abused/misused. Patients should be warned that it is
extremely dangerous to self-administer non-prescribed
benzodiazepines while taking Buprenorphine Sublingual Tablets, and should also be cautioned to use benzodiazepines
concurrently with Buprenorphine Sublingual Tablets only as
directed by their physician.
7.4 Serotonergic Drugs
SPL UNCLASSIFIED SECTION
The concomitant use of opioids with other drugs that affect the serotonergic neurotransmitter system, such as selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), triptans, 5-HT3 receptor antagonists, drugs that effect the serotonin neurotransmitter system (e.g., mirtazapine, trazodone, tramadol), and monoamine oxidase (MAO) inhibitors (those intended to treat psychiatric disorders and also others, such as linezolid and intravenous methylene blue), has resulted in serotonin syndrome.
If concomitant use is warranted, carefully observe the patient, particularly during treatment initiation and dose adjustment. Discontinue Buprenorphine Sublingual Tablets if serotonin syndrome is suspected.
8 USE IN SPECIFIC POPULATIONS
USE IN SPECIFIC POPULATIONS SECTION
8.1 Pregnancy
PREGNANCY SECTION
SPL UNCLASSIFIED SECTION
Pregnancy Category C
TERATOGENIC EFFECTS SECTION
Risk
Summary
There are no adequate and
well-controlled studies of Buprenorphine Sublingual Tablets in pregnant women. Limited
published data on use of buprenorphine, the
active ingredient in Buprenorphine Sublingual Tablets, in pregnancy, have not shown
an increased risk of major malformations. All
pregnancies, regardless of drug exposure, have a
background risk of 2% to 4% for major birth defects,
and 15% to 20% for pregnancy loss. Reproductive and
developmental studies in rats and rabbits
identified adverse events at clinically relevant
doses. Pre-and postnatal development studies in
rats demonstrated dystocia, increased neonatal
deaths, and developmental delays. No clear
teratogenic effects were seen with a range of
doses equivalent to or greater than the human
dose. However, in a few studies, some events
such as acephalus, omphalocele, and skeletal
abnormalities were observed but these findings
were not clearly treatment-related. Embryofetal
death was also observed in both rats and
rabbits.
Buprenorphine Sublingual Tablets
should be used during pregnancy only if the
potential benefit justifies the potential risk
to the fetus.
NONTERATOGENIC EFFECTS SECTION
Clinical
Considerations
Disease-associated maternal and
embryo-fetal risk
Untreated opioid addiction in pregnancy is associated with adverse obstetrical outcomes such as low birth weight, preterm birth, and fetal death. In addition, untreated opioid addiction often results in continued or relapsing illicit opioid use.
Fetal/neonatal adverse
reactions
Neonatal opioid withdrawal syndrome may occur in newborn infants of mothers who are receiving treatment with Buprenorphine Sublingual Tablets
.
Neonatal opioid withdrawal syndrome presents as irritability, hyperactivity and abnormal sleep pattern, high pitched cry, tremor, vomiting, diarrhea, and/or failure to gain weight. Signs of neonatal withdrawal usually occur in the first days after birth. The duration and severity of neonatal opioid withdrawal syndrome may vary. Observe newborns for signs of neonatal opioid withdrawal syndrome and manage accordingly. [
see Warnings and Precautions (
5.5)
].
Labor or
Delivery
As with all opioids,
use of buprenorphine prior to delivery may
result in respiratory depression in the newborn.
Closely monitor neonates for signs of
respiratory depression. An opioid antagonist
such as naloxone should be available for
reversal of opioid induced respiratory
depression in the neonate.
SPL UNCLASSIFIED SECTION
Data Human
Data
Studies have been
conducted to evaluate neonatal outcomes in women
exposed to buprenorphine during pregnancy.
Limited published data on malformations from
trials, observational studies, case series, and
case reports on buprenorphine use in pregnancy
have not shown an increased risk of major
malformations. Based on these studies the
incidence of neonatal abstinence syndrome is not
clear and there does not appear to be a
dose-response relationship.
Animal
Data
Buprenorphine was not
teratogenic in rats or rabbits after IM or
subcutaneous (SC) doses up to 5 mg/kg/day
(estimated exposure was approximately 3 and 6
times, respectively, the recommended human daily
sublingual dose of 16 mg on a mg/m
2
basis), after IV doses up to 0.8 mg/kg/day
(estimated exposure was approximately 0.5 times
and equal to, respectively, the recommended
human daily sublingual dose of 16 mg on a
mg/m
2 basis), or after oral doses
up to 160 mg/kg/day in rats (estimated exposure
was approximately 95 times the recommended human
daily sublingual dose of 16 mg on a
mg/m
2 basis) and 25 mg/kg/day in
rabbits (estimated exposure was approximately 30
times the recommended human daily sublingual
dose of 16 mg on a mg/m
2 basis).
Significant increases in skeletal abnormalities
(e.g., extra thoracic vertebra or thoraco-lumbar
ribs) were noted in rats after SC administration
of 1 mg/kg/day and up (estimated exposure was
approximately 0.6 times the recommended human
daily sublingual dose of 16 mg on a
mg/m
2 basis), but were not observed
at oral doses up to 160 mg/kg/day. Increases in
skeletal abnormalities in rabbits after IM
administration of 5 mg/kg/day (estimated
exposure was approximately 6 times the
recommended human daily sublingual dose of 16 mg
on a mg/m
2 basis) or oral
administration of 1 mg/kg/day or greater
(estimated exposure was approximately equal to
the recommended human daily sublingual dose of
16 mg on a mg/m
2 basis) were not
statistically significant.
In rabbits, buprenorphine produced
statistically significant pre-implantation
losses at oral doses of 1 mg/kg/day or greater
and post- implantation losses that were
statistically significant at IV doses of 0.2
mg/kg/day or greater (estimated exposure was
approximately 0.3 times the recommended human
daily sublingual dose of 16 mg on a
mg/m
2 basis).
Dystocia was noted in pregnant rats
treated intramuscularly with buprenorphine 5
mg/kg/day (approximately 3 times the recommended
human daily sublingual dose of 16 mg on a
mg/m
2 basis). Fertility, peri-
and post-natal development studies with
buprenorphine in rats indicated increases in
neonatal mortality after oral doses of 0.8
mg/kg/day and up (approximately 0.5 times the
recommended human daily sublingual dose of 16 mg
on a mg/m
2 basis), after IM doses of
0.5 mg/kg/day and up (approximately 0.3 times
the recommended human daily sublingual dose of
16 mg on a mg/m
2 basis), and after SC
doses of 0.1 mg/kg/day and up (approximately
0.06 times the recommended human daily
sublingual dose of 16 mg on mg/m
2
basis). An apparent lack of milk production
during these studies likely contributed to the
decreased pup viability and lactation
indices. Delays in the occurrence of
righting reflex and startle response were noted
in rat pups at an oral dose of 80 mg/kg/day
(approximately 50 times the recommended human
daily sublingual dose of 16 mg on a
mg/m
2 basis).
8.3 Nursing Mothers
NURSING MOTHERS SECTION
Risk Summary
Based on two studies in 13 lactating women,
buprenorphine and its metabolite norbuprenorphine are present in
low levels in human milk and infant urine, and available data
have not shown adverse reactions in breastfed infants. There are
no data on the combination product buprenorphine/naloxone in
breastfeeding, however oral absorption of naloxone is minimal.
Caution should be exercised when buprenorphine is administered to a nursing woman. The developmental and
health benefits of breastfeeding should be considered along with
the mother’s clinical need for buprenorphine and any potential adverse effects on the
breastfed child from the drug or from the underlying maternal
condition.
Clinical Considerations
Advise the
nursing mother taking buprenorphine to
monitor the infant for increased drowsiness and breathing
difficulties.
Data
Based on limited data from a study of 6 lactating
women who were taking a median oral dose of buprenorphine of
0.29 mg/kg/day 5 to 8 days after delivery, breast milk contained a
median infant dose of 0.42 mcg/kg/day of buprenorphine and 0.33
mcg/kg/day of norbuprenorphine, which are equal to 0.2% and
0.12% of the maternal weight-adjusted dose.
Based on limited data from a study of 7 lactating women
who were taking a median oral dose of buprenorphine of 7 mg/day
an average of 1.12 months after delivery, the mean milk
concentrations of buprenorphine and norbuprenorphine were 3.65
mcg/L and 1.94 mcg/L respectively. Based on the limited data
from this study, and assuming milk consumption of 150 mL/kg/day,
an exclusively breastfed infant would receive an estimated mean
of 0.55 mcg/kg/day of buprenorphine and 0.29 mcg/kg/day of
norbuprenorphine, which are 0.38% and 0.18% of the maternal
weight-adjusted dose.
No adverse reactions were observed in the infants in
these two studies.
Females and Males of Reproductive Potential
Infertility
Chronic use of opioids may cause reduced fertility in females and males of reproductive potential. It is not known whether these effects on fertility are reversible [see Adverse Reactions (
6.2)].
8.4 Pediatric Use
PEDIATRIC USE SECTION
The safety and effectiveness of Buprenorphine
Sublingual Tablet has not been established in pediatric
patients.
8.5 Geriatric Use
GERIATRIC USE SECTION
Clinical studies of Buprenorphine Sublingual Tablets,
buprenorphine and naloxone sublingual film, or buprenorphine and
naloxone sublingual tablet did not include sufficient numbers
of subjects aged 65 and over to determine whether they responded
differently than younger subjects. Other reported clinical
experience has not identified differences in responses between
the elderly and younger patients. In general, dose selection for
an elderly patient should be cautious, usually starting at the
low end of the dosing range, reflecting the greater frequency of
decreased hepatic, renal, or cardiac function, and of
concomitant disease or other drug therapy.
8.6 Hepatic Impairment
SPL UNCLASSIFIED SECTION
The effects of hepatic impairment on the pharmacokinetics
of buprenorphine were evaluated in a pharmacokinetic study.
Buprenorphine is extensively metabolized in the liver
and buprenorphine plasma levels were found to be higher and the
half-life was found to be longer in subjects with moderate and
severe hepatic impairment, but not in subjects with mild hepatic
impairment.
For patients with severe hepatic impairment, a dose
adjustment is recommended, and patients with moderate or severe
hepatic impairment should be monitored for signs and symptoms of
toxicity or overdose caused by increased levels of
buprenorphine.
[see Dosage and
Administration (
2.5), Warnings and Precautions (
5.12) and Clinical Pharmacology (
12.3)]
.
8.7 Renal Impairment
SPL UNCLASSIFIED SECTION
No differences in buprenorphine pharmacokinetics were
observed between 9 dialysis-dependent and 6 normal patients
following IV administration of 0.3 mg buprenorphine.
9 DRUG ABUSE AND DEPENDENCE
DRUG ABUSE AND DEPENDENCE SECTION
9.1 Controlled Substance
CONTROLLED SUBSTANCE SECTION
Buprenorphine is a Schedule III narcotic under the
Controlled Substances Act.
Under the Drug Addiction Treatment Act
(DATA) codified at 21 U.S.C. 823(g), prescription use of
this product in the treatment of opioid dependence is
limited to physicians who meet certain qualifying
requirements, and who have notified the Secretary of Health
and Human Services (HHS) of their intent to prescribe this
product for the treatment of opioid dependence and have been
assigned a unique identification number that must be
included on every prescription.
9.2 Abuse
ABUSE SECTION
Buprenorphine, like morphine and other opioids, has the
potential for being abused and is subject to criminal diversion.
This should be considered when prescribing or dispensing
buprenorphine in situations when the clinician is concerned
about an increased risk of misuse, abuse, or diversion.
Healthcare professionals should contact their state professional
licensing board or state controlled substances authority for
information on how to prevent and detect abuse or diversion of
this product.
Patients who continue to misuse, abuse, or divert,
buprenorphine products or other opioids should be provided or
referred for more intensive and structured treatment.
Abuse of buprenorphine poses a risk of overdose and
death. This risk is increased with the abuse of buprenorphine
and alcohol and other substances, especially benzodiazepines.
The physician may be able to more easily detect misuse or
diversion by maintaining records of medication prescribed
including date, dose, quantity, frequency of refills, and
renewal requests of medication prescribed.
Proper assessment of the patient, proper prescribing
practices, periodic re-evaluation of therapy, and proper
handling and storage of the medication are appropriate measures
that help to limit abuse of opioid drugs.
9.3 Dependence
DEPENDENCE SECTION
Buprenorphine is a partial agonist at the mu-opioid
receptor and chronic administration produces physical dependence
of the opioid type, characterized by moderate withdrawal signs
and symptoms upon abrupt discontinuation or rapid taper. The
withdrawal syndrome is typically milder than seen with full
agonists and may be delayed in onset.
[see Warnings and Precautions (
5.5)].
Neonatal opioid withdrawal syndrome (NOWS) is an expected and treatable outcome of prolonged use of opioids during pregnancy
[
see Warnings and Precautions (
5.5)
]
10 OVERDOSAGE
OVERDOSAGE SECTION
The manifestations of acute overdose include pinpoint pupils,
sedation, hypotension, respiratory depression, and death.
In the event of overdose, the respiratory and cardiac status of
the patient should be monitored carefully. When respiratory or cardiac
functions are depressed, primary attention should be given to the
re-establishment of adequate respiratory exchange through provision of a
patent airway and institution of assisted or controlled ventilation.
Oxygen, IV fluids, vasopressors, and other supportive measures should be
employed as indicated.
In the case of overdose, the primary
management should be the re-establishment of adequate ventilation
with mechanical assistance of respiration, if required. Naloxone may
be of value for the management of buprenorphine overdose. Higher
than normal doses and repeated administration may be necessary. The
long duration of action of buprenorphine
should be taken into consideration when determining the length of
treatment and medical surveillance needed to reverse the effects of
an overdose. Insufficient duration of monitoring may put patients at
risk.
11 DESCRIPTIONS
DESCRIPTION SECTION
Buprenorphine Sublingual Tablets are uncoated round white
tablets intended for sublingual administration. The tablets contain buprenorphine HCL and are available in two
dosage strengths, 2 mg buprenorphine and 8 mg buprenorphine (as free base).
Each tablet also contains citric acid, cornstarch, lactose monohydrate,
mannitol, povidone K30, sodium citrate anhydrous and sodium stearyl
fumerate. The 2 mg buprenorphine tablet is debossed with a
"2" on one side and an "→"
on the other. The 8 mg buprenorphine tablet is debossed with a
"8" on one side and an "→"
on the other.
Chemically, buprenorphine HCl is
(2S)-2-[17-Cyclopropylmethyl-4,5α-epoxy-3-hydroxy-6-methoxy-6α,14-ethano-14α-
morphinan-7α-yl]-3,3dimethylbutan-2-ol hydrochloride.
It has the following chemical structure:
Chemical Structure
Buprenorphine HCl has the molecular formula
C
29H
41 NO
4 ∙ HCl and the
molecular weight is 504.10. It is a white or off-white crystalline
powder, sparingly soluble in water, freely soluble in methanol, soluble
in alcohol and practically insoluble in cyclohexane.
12 CLINICAL PHARMACOLOGY
CLINICAL PHARMACOLOGY SECTION
12.1 Mechanism of Action
MECHANISM OF ACTION SECTION
Buprenorphine Sublingual Tablets contain
buprenorphine. Buprenorphine is a partial agonist at the
mu-opioid receptor and an antagonist at the kappa-opioid
receptor.
12.2 Pharmacodynamics
PHARMACODYNAMICS SECTION
SPL UNCLASSIFIED SECTION
Subjective Effects:
Comparisons of buprenorphine to full opioid
agonists such as methadone and hydromorphone suggest
that sublingual buprenorphine produces typical opioid
agonist effects which are limited by a ceiling effect.
Opioid agonist ceiling-effects were also observed
in a double-blind, parallel group, dose-ranging
comparison of single doses of buprenorphine sublingual
solution (1, 2, 4, 8, 16, or 32 mg), placebo and a full
agonist control at various doses. The treatments were
given in ascending dose order at intervals of at least
one week to 16 opioid-experienced subjects who were not
physically dependent. Both active drugs produced typical
opioid agonist effects. For all measures for which the
drugs produced an effect, buprenorphine produced a
dose-related response. However, in each case, there was
a dose that produced no further effect. In contrast, the
highest dose of the full agonist control always produced
the greatest effects. Agonist objective rating scores
remained elevated for the higher doses of buprenorphine
(8mg to 32 mg) longer than for the lower doses and did not
return to baseline until 48 hours after drug
administration. The onset of effects appeared more
rapidly with buprenorphine than with the full agonist
control, with most doses nearing peak effect after 100
minutes for buprenorphine compared to 150 minutes for
the full agonist control.
SPL UNCLASSIFIED SECTION
Physiologic Effects:
Buprenorphine in IV (2, 4, 8, 12 and 16 mg)
and sublingual (12 mg) doses have been administered to
opioid- experienced subjects who were not physically
dependent to examine cardiovascular, respiratory and
subjective effects at doses comparable to those used for
treatment of opioid dependence. Compared to placebo,
there were no statistically significant differences
among any of the treatment conditions for blood
pressure, heart rate, respiratory rate, O
2
saturation, or skin temperature across time. Systolic BP
was higher in the 8 mg group than placebo (3-hour AUC
values). Minimum and maximum effects were similar across
all treatments. Subjects remained responsive to low
voice and responded to computer prompts. Some subjects
showed irritability, but no other changes were observed.
The respiratory effects of sublingual
buprenorphine were compared with the effects of
methadone in a double-blind, parallel group, dose
ranging comparison of single doses of buprenorphine
sublingual solution (1, 2, 4, 8, 16, or 32 mg) and oral
methadone (15, 30, 45, or 60 mg) in non-dependent,
opioid-experienced volunteers. In this study,
hypoventilation not requiring medical intervention was
reported more frequently after buprenorphine doses of 4
mg and higher than after methadone. Both drugs decreased
O
2 saturation to the same
degree.
Effects on the Endocrine System:
Chronic use of opioids may influence the hypothalamic-pituitary-gonadal axis, leading to hormonal changes that may manifest as low libido, impotence, erectile dysfunction, amenorrhea, or infertility. The causal role of opioids in the clinical syndrome of hypogonadism is unknown because the various medical, physical, lifestyle and psychological stressors that may influence gonadal hormone levels have not been adequately controlled for in studies conducted to date
[see Adverse Reactions (
6.2)].
12.3 Pharmacokinetics
PHARMACOKINETICS SECTION
SPL UNCLASSIFIED SECTION
Absorption: Plasma levels of buprenorphine increased with
the sublingual dose of Buprenorphine Sublingual Tablets (Table 3). There was wide inter-patient
variability in the sublingual absorption of
buprenorphine, but within subjects the variability was
low. Both C
max and AUC of buprenorphine
increased in a linear fashion with the increase in dose
(in the range of 4 to 16 mg), although the increase was
not directly dose-proportional.
Table 3: Pharmacokinetic Parameters of Buprenorphine and Norbuprenorphine After the
Sublingual Administration of Buprenorphine Sublingual Tablets
aSource: Study Report 20-A78-AU bSource: Study Report 20-276-SA cSource: Study Report 20-A79-AU
Dose
Analyte
Mean
SD
C
max (ng/mL)
T
max (h
)
AUC
inf (h∙ng/mL)
t1/2 (h)
2 mg
a
Buprenorphine
Mean
SD
1.25
0.584
1.84
0.62
10.93
3.945
31.66
12.66
Norbuprenorphine
Mean
SD
0.301
0.127
2.36
2.75
12.39
4.526
39.28
20.85
8 mg
b
Buprenorphine
Mean
SD
2.88
1.14
1.28
0.46
28.39
10.22
35.01
14.7
Norbuprenorphine
Mean
SD
1.38
0.752
1.75
2.11
50.18
22.61
44.33
19.27
16 mg
c
Buprenorphine
Mean
SD
4.70
2.16
1.42
0.50
47.09
20.03
36.51
13.99
Norbuprenorphine
Mean
SD
2.65
1.62
1.52
1.34
92.31
34.74
40.35
12.07
SPL UNCLASSIFIED SECTION
Distribution: Buprenorphine is approximately 96% protein
bound, primarily to alpha and beta globulin.
SPL UNCLASSIFIED SECTION
Metabolism: Buprenorphine undergoes both N-dealkylation to
norbuprenorphine and glucuronidation. The N-dealkylation
pathway is mediated primarily by CYP3A4.
Norbuprenorphine, the major metabolite, can further
undergo glucuronidation. Norbuprenorphine has been found
to bind opioid receptors
in-vitro; however, it has not been
studied clinically for opioid-like activity.
SPL UNCLASSIFIED SECTION
Elimination: A mass balance study of buprenorphine showed
complete recovery of radiolabel in urine (30%) and feces
(69%) collected up to 11 days after dosing. Almost all
of the dose was accounted for in terms of
buprenorphine, norbuprenorphine, and two unidentified
buprenorphine metabolites. In urine, most of
buprenorphine and norbuprenorphine was conjugated
(buprenorphine, 1% free and 9.4% conjugated;
norbuprenorphine, 2.7% free and 11% conjugated). In
feces, almost all of the buprenorphine and
norbuprenorphine were free (buprenorphine, 33% free and
5% conjugated; norbuprenorphine, 21% free and 2%
conjugated).
Buprenorphine has a mean elimination half-life
from plasma ranging from 31 to 35 hours.
SPL UNCLASSIFIED SECTION
Drug-drug interactions:
CYP3A4
Inhibitors and Inducers: Subjects
receiving Buprenorphine Sublingual Tablets should be
monitored if inhibitors of CYP3A4 such as azole
antifungal agents (e.g., ketoconazole), macrolide
antibiotics (e.g., erythromycin) or HIV protease
inhibitors and may require dose-reduction of one or both
agents. The interaction of buprenorphine with all CYP3A4
inducers has not been studied, therefore it is
recommended that patients receiving Buprenorphine Sublingual Tablets be monitored for signs and symptoms
of opioid withdrawal if inducers of CYP3A4 (e.g.,
phenobarbital, carbamazepine, phenytoin, rifampicin) are
co-administered
[see Drug
Interactions (
7.1)].
Buprenorphine has been found to be a CYP2D6 and
CYP3A4 inhibitor and its major metabolite,
norbuprenorphine has been found to be a moderate CYP2D6
inhibitor in
in vitro
studies employing human liver microsomes.
However, the relatively low plasma concentrations of
buprenorphine and norbuprenorphine resulting from
therapeutic doses are not expected to raise significant
drug-drug interaction concerns.
SPL UNCLASSIFIED SECTION
Special
Populations
Hepatic
Impairment: In a pharmacokinetic
study, the disposition of buprenorphine was determined
after administering a 2mg/0.5 mg buprenorphine and
naloxone sublingual tablet in subjects with varied
degrees of hepatic impairment as indicated by Child-Pugh
criteria. The disposition of buprenorphine in patients
with hepatic impairment was compared to disposition in
subjects with normal hepatic function.
In subjects with mild hepatic impairment, the
changes in mean C
max, AUC
0-last,
and half-life values of buprenorphine were not
clinically significant. No dose adjustment is needed in
patients with mild hepatic impairment.
For subjects with moderate and severe hepatic
impairment, mean C
max, AUC
0-last,
and half-life values of buprenorphine were increased
(Table 4).
[see Warnings
and Precautions (
5.12) and Use in Specific
Populations (
8.6)]
.
Table 4. Changes in Buprenorphine Pharmacokinetic Parameters in Subjects with Moderate and Severe Hepatic Impairment
Hepatic
Impairment
PK Parameters
Increase in buprenorphine
compared to healthy subjects
Moderate
C
max
8%
AUC
0-last
64%
Half-life
35%
Severe
C
max
72%
AUC
0-last
181%
Half-life
57%
HCV infection: In subjects with HCV infection but
no sign of hepatic impairment, the changes in the mean
C
max, AUC
0-last, and
half-life values of buprenorphine were not clinically
significant in comparison to healthy subjects without
HCV infection. No dose adjustment is needed in patients
with HCV infection.
13 NONCLINICAL TOXICOLOGY
NONCLINICAL TOXICOLOGY SECTION
13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility
CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION
SPL UNCLASSIFIED SECTION
Carcinogenicity:
Carcinogenicity studies of buprenorphine were
conducted in Sprague-Dawley rats and CD-1 mice.
Buprenorphine was administered in the diet to rats at
doses of 0.6, 5.5, and 56 mg/kg/day (estimated exposure
was approximately 0.4, 3 and 35 times the recommended
human daily sublingual dose of 16 mg on a
mg/m
2 basis) for 27 months. As in the
buprenorphine/naloxone carcinogenicity study in rat,
statistically significant dose-related increases in
Leydig cell tumors occurred. In an 86-week study in CD-1
mice, buprenorphine was not carcinogenic at dietary
doses up to 100 mg/kg/day (estimated exposure was
approximately 30 times the recommended human daily
sublingual dose of 16 mg on a mg/m
2
basis).
SPL UNCLASSIFIED SECTION
Mutagenicity:
Buprenorphine was studied in a series of tests utilizing
gene, chromosome, and DNA interactions in both
prokaryotic and eukaryotic systems. Results were
negative in yeast (
S.
cerevisiae) for recombinant, gene
convertant, or forward mutations; negative in
Bacillus subtilis
"rec" assay, negative for
clastogenicity in CHO cells, Chinese hamster bone marrow
and spermatogonia cells, and negative in the mouse
lymphoma L5178Y assay.
Results were equivocal in the Ames test: negative
in studies in two laboratories, but positive for frame
shift mutation at a high dose (5 mg/plate) in a third
study. Results were positive in the Green-Tweets
(
E. coli)
survival test, positive in a DNA synthesis inhibition
(DSI) test with testicular tissue from mice, for both
in vivo and
in vitro
incorporation of [
3H]thymidine, and positive
in unscheduled DNA synthesis (UDS) test using testicular
cells from mice.
SPL UNCLASSIFIED SECTION
Impairment of
Fertility:
Reproduction studies of buprenorphine in rats
demonstrated no evidence of impaired fertility at daily
oral doses up to 80 mg/kg/day (estimated exposure was
approximately 50 times the recommended human daily
sublingual dose of 16 mg on a mg/m
2 basis) or
up to 5 mg/kg/day IM or SC (estimated exposure was
approximately 3 times the recommended human daily
sublingual dose of 16 mg on a mg/m
2
basis).
14 CLINICAL STUDIES
CLINICAL STUDIES SECTION
Clinical data on the safety and efficacy of buprenorphine were derived from studies of Buprenorphine Sublingual
Tablet formulations, with and without naloxone, and from studies of
sublingual administration of a more bioavailable ethanolic solution of
buprenorphine.
Buprenorphine Sublingual Tablets were studied in 1834 patients;
buprenorphine and naloxone tablets in 575 patients, and buprenorphine
sublingual solutions in 2470 patients. A total of 1270 women received
buprenorphine in those clinical trials. Dosing recommendations are based
on data from one trial of both tablet formulations and two trials of the
ethanolic solution. All trials used buprenorphine in conjunction with
psychosocial counseling as part of a comprehensive addiction treatment
program. There were no clinical studies conducted to assess the efficacy
of buprenorphine as the only component of treatment.
In a double-blind placebo- and active-controlled study, 326
heroin-addicted subjects were randomly assigned to either buprenorphine
and naloxone sublingual tablets, 16/4 mg per day; Buprenorphine Sublingual Tablets, 16 mg per day; or placebo sublingual tablets. For
subjects randomized to either active treatment, dosing began with one 8
mg Buprenorphine on Day 1, followed by 16 mg (two
8 mg tablets) of buprenorphine on Day 2. On Day
3, those randomized to receive buprenorphine and naloxone sublingual
tablets were switched to the combination tablet. Subjects randomized to
placebo received one placebo tablet on Day 1 and two placebo tablets per
day thereafter for four weeks. Subjects were seen daily in the clinic
(Monday through Friday) for dosing and efficacy assessments. Take-home
doses were provided for weekends. Subjects were instructed to hold the
medication under the tongue for approximately 5 to 10 minutes until
completely dissolved. Subjects received counseling regarding HIV
infection and up to one hour of individualized counseling per week. The
primary study comparison was to assess the efficacy of buprenorphine and
naloxone sublingual tablets and Buprenorphine Sublingual Tablets
individually against placebo sublingual tablet. The percentage of
thrice-weekly urine samples that were negative for non-study opioids was
statistically higher for both buprenorphine and naloxone sublingual
tablets and Buprenorphine Sublingual Tablets than for placebo
sublingual tablets.
In a double-blind, double-dummy, parallel-group study comparing
buprenorphine ethanolic solution to a full agonist active control, 162
subjects were randomized to receive the ethanolic sublingual solution of
buprenorphine at 8 mg/day (a dose which is roughly comparable to a dose
of 12 mg per day of Buprenorphine Sublingual Tablets), or two
relatively low doses of active control, one of which was low enough to
serve as an alternative to placebo, during a 3 to 10 day induction
phase, a 16-week maintenance phase and a 7-week detoxification phase.
Buprenorphine was titrated to maintenance dose by Day 3; active control
doses were titrated more gradually.
Maintenance dosing continued through Week 17, and then
medications were tapered by approximately 20% to 30% per week over Weeks
18 to 24, with placebo dosing for the last two weeks. Subjects received
individual and/or group counseling weekly.
Based on retention in treatment and the percentage of
thrice-weekly urine samples negative for non-study opioids,
buprenorphine was more effective than the low dose of the control, in
keeping heroin addicts in treatment and in reducing their use of opioids
while in treatment. The effectiveness of buprenorphine, 8 mg per day was
similar to that of the moderate active control dose, but equivalence was
not demonstrated.
In a dose-controlled, double-blind, parallel-group, 16-week
study, 731 subjects were randomized to receive one of four doses of
buprenorphine ethanolic solution: 1 mg, 4 mg, 8 mg, and 16 mg.
Buprenorphine was titrated to maintenance doses over 1 to 4 days and
continued for 16 weeks. Subjects received at least one session of AIDS
education and additional counseling ranging from one hour per month to
one hour per week, depending on site.
Based on retention in treatment and the percentage of
thrice-weekly urine samples negative for non-study opioids, the three
highest tested doses were superior to the 1 mg dose. Therefore, this
study showed that a range of buprenorphine doses may be effective. The 1
mg dose of buprenorphine sublingual solution can be considered to be
somewhat lower than a 2 mg tablet dose. The other doses used in the
study encompass a range of tablet doses from approximately 6 mg to
approximately 24 mg.
16 HOW SUPPLIED/STORAGE AND HANDLING
HOW SUPPLIED SECTION
Buprenorphine Sublingual Tablets are supplied in white HDPE
bottles.
2 mg - White, round, biconvex uncoated tablets with
"2" debossed on one side and a dart
"→" debossed on the other side
NDC 50383-924-93
30 tablets per bottle
8 mg - White, round, biconvex uncoated tablets with
"8" debossed on one side and a dart
"→" debossed on the other side
NDC 50383-930-93
30 tablets per bottle
STORAGE AND HANDLING SECTION
Storage
Store at 25°C (77°F), excursions permitted to 15° to
30°C (59° to 86°F). [See USP
Controlled Room Temperature].
Dispense in a tight, light-resistant container as defined in USP.
CAUTION: DEA Order Form Required.
Patients should be advised to
store buprenorphine-containing medications safely and out of
sight and reach of children.
Destroy any
unused medication appropriately.
[see Patient Counseling (
17)].
Safe Use
Before initiating treatment with Buprenorphine Sublingual Tablets, explain the points listed below to
caregivers and patients. Instruct patients to read the Medication
Guide each time Buprenorphine Sublingual Tablets are dispensed
because new information may be available.
Patients should be warned that it is extremely dangerous to
self-administer non-prescribed benzodiazepines or other CNS
depressants (including alcohol) while taking Buprenorphine Sublingual Tablets. Patients prescribed benzodiazepines or other CNS
depressants should be cautioned to use them only as directed by
their physicians.
[see Warnings and
Precautions (
5.2), Drug Interactions (
7.3)].
Patients should be advised that Buprenorphine Sublingual Tablets contains an opioid that can be a target for people who abuse
prescription medications or street drugs. Patients should be
cautioned to keep their tablets in a safe place, and to protect them
from theft.
Patients should be instructed to keep Buprenorphine Sublingual Tablets in a secure place, out of the sight and reach of children.
Accidental or deliberate ingestion by a child may cause respiratory
depression that can result in death. Patients should be advised that
if a child is exposed to Buprenorphine Sublingual Tablets,
medical attention should be sought immediately.
Inform patients that Buprenorphine Sublingual Tablets could cause a rare but potentially life-threatening condition resulting from concomitant administration of serotonergic drugs. Warn patients of the symptoms of serotonin syndrome and to seek medical attention right away if symptoms develop. Instruct patients to inform their physicians if they are taking, or plan to take serotonergic medications [
see Drug Interactions (
7.4].
Inform patients that Buprenorphine Sublingual Tablets could cause adrenal insufficiency, a potentially life-threatening condition. Adrenal insufficiency may present with non-specific symptoms and signs such as nausea, vomiting, anorexia, fatigue, weakness, dizziness, and low blood pressure. Advise patients to seek medical attention if they experience a constellation of these symptoms [
see Warnings and Precautions (
5.6)].
Patients should be advised never to give Buprenorphine Sublingual Tablets to anyone else, even if he or she has the same
signs and symptoms. It may cause harm or death.
Patients should be advised that selling or giving away this
medication is against the law.
Patients should be cautioned that Buprenorphine Sublingual Tablets may impair the mental or physical abilities required for the
performance of potentially dangerous tasks such as driving or
operating hazardous machinery. Caution should be taken especially
during drug induction and dose adjustment and until individuals are
reasonably certain that buprenorphine therapy does not adversely
affect their ability to engage in such activities.
[see Warnings and Precautions (
5.13)].
Patients should be advised not to change the dosage of
Buprenorphine Sublingual Tablets without consulting their
physicians.
Patients should be advised to take Buprenorphine Sublingual Tablets once a day.
Patients should be informed that Buprenorphine Sublingual Tablets can cause drug dependence and that withdrawal signs and
symptoms may occur when the medication is discontinued.
Patients seeking to discontinue treatment with buprenorphine for
opioid dependence should be advised to work closely with their
physicians on a tapering schedule and should be apprised of the
potential to relapse to illicit drug use associated with
discontinuation of opioid agonist/partial agonist
medication-assisted treatment.
Patients should be cautioned that, like other opioids,
Buprenorphine Sublingual Tablets may produce orthostatic
hypotension in ambulatory individuals.
[see Warnings and Precautions (
5.12)].
Patients should inform their physicians if any other prescription
medications, over-the-counter medications, or herbal preparations
are prescribed or currently being used.
[see Drug Interactions (
7.1,
7.2 and
7.3)].
Advise women that if they are pregnant while being treated with Buprenorphine Sublingual Tablets, the baby may have signs of withdrawal at birth and that withdrawal is treatable [
see Warnings and Precautions (
5.5), Specific Populations (
8.1)
].
Patients should be warned that buprenorphine passes into breast
milk. Breast-feeding is therefore not advised in mothers treated
with buprenorphine products.
[see
Specific Populations (
8.3)].
Patients should inform their family members that, in the event of
emergency, the treating physician or emergency room staff should be
informed that the patient is physically dependent on an opioid and
that the patient is being treated with Buprenorphine Sublingual Tablets.
Refer to the Medication Guide for additional information regarding
the counseling information.
Disposal of Unused Buprenorphine Sublingual Tablets Unused Buprenorphine Sublingual Tablets should be
disposed of as soon as they are no longer needed. Flush unused tablets
down the toilet.
IMPORTANT: Keep Buprenorphine Sublingual Tablets in a secure
place away from children. Accidental use by a child is a medical
emergency and can result in death. If a child accidentally uses
Buprenorphine Sublingual Tablets, get emergency help right
away.
SPL UNCLASSIFIED SECTION
Read this Medication Guide before you start taking
Buprenorphine Sublingual Tablets and each time you get a
refill. There may be new information. This Medication Guide does
not take the place of talking to your doctor. Talk to your
doctor or pharmacist if you have questions about Buprenorphine
Sublingual Tablets.
Share the important information in this Medication Guide
with members of your household.
What is the most important information
I should know about Buprenorphine Sublingual Tablets?
Buprenorphine Sublingual Tablets can cause serious and
life-threatening breathing problems. Call your doctor right
away or get emergency help if:
You feel faint, dizzy or confused
Your breathing gets much slower than is normal for
you
These can be signs of an overdose or other serious
problems.
Buprenorphine Sublingual Tablets contains an opioid
that can cause physical dependence.
Do not stop taking Buprenorphine Sublingual
Tablets without talking to your doctor. You could
become sick with uncomfortable withdrawal signs and
symptoms because your body has become used to this
medicine.
Physical dependence is not the same as drug
addiction
Buprenorphine Sublingual Tablets are not for
occasional or "as needed"
use
An overdose, and even death, can happen if you take
benzodiazepines, sedatives, tranquilizers, or alcohol while
using Buprenorphine Sublingual Tablets. Ask your doctor
what you should do if you are taking one of these.
Call a doctor or get emergency help right away if
you:
Feel sleepy and uncoordinated
Have blurred vision
Have slurred speech
Cannot think well or clearly
Have slowed reflexes and breathing
Do not inject ("shoot-up") Buprenorphine
Sublingual Tablets.
Injecting this medicine may cause life-threatening
infections and other serious health problems
Injecting Buprenorphine Sublingual Tablets may
cause serious withdrawal symptoms such as pain,
cramps, vomiting, diarrhea, anxiety, sleep problems
and cravings
In an emergency, have family members tell the emergency
department staff that you are physically dependent on an
opioid and are being treated with Buprenorphine Sublingual Tablets .
What is Buprenorphine Sublingual
Tablets?
Buprenorphine Sublingual Tablets is a prescription
medicine used to begin treatment in adults who are addicted
to (dependent on) opioid drugs (either prescription or
illegal), as part of a complete treatment program that also
includes counseling and behavioral therapy.
Buprenorphine Sublingual Tablets are most often used
for the first 1 or 2 days to help you start with
treatment.
BOXED WARNING SECTION
Buprenorphine Sublingual Tablets is a controlled
substance (CIII) because it contains buprenorphine, which can be
a target for people who abuse prescription medicines or street
drugs. Keep your Buprenorphine Sublingual Tablets in a safe
place to protect them from theft. Never give your Buprenorphine
Sublingual Tablets to anyone else; they can cause death or
harm them. Selling or giving away this medicine is against the
law.
SPL UNCLASSIFIED SECTION
It is not known if Buprenorphine Sublingual Tablets is
safe or effective in children.
Who should not take Buprenorphine Sublingual Tablets?
Do not take Buprenorphine Sublingual Tablets if you
are allergic to buprenorphine.
What should I tell my doctor before
taking Buprenorphine Sublingual Tablets?
Buprenorphine Sublingual Tablets
may not be right for you. Before taking Buprenorphine Sublingual Tablets, tell your doctor if you:
Have trouble breathing or lung problems
Have an enlarged prostate gland (men)
Have a head injury or brain problem
Have problems urinating
Have a curve in your spine that affects your breathing
Have liver or kidney problems
Have gallbladder problems
Have adrenal gland problems
Have Addison's disease
Have low thyroid (hypothyroidism)
Have a history of alcoholism
Have mental problems such as hallucinations (seeing or
hearing things that are not there)
Have any other medical condition
Are pregnant or plan to become pregnant. If you take Buprenorphine Sublingual Tablets while pregnant, your baby may have symptoms of opioid withdrawal or respiratory depression at birth. Talk to your doctor if you are pregnant or plan to become pregnant.
Are breastfeeding or plan to breastfeed. Buprenorphine
hydrochloride can pass into your milk and may harm the baby. Talk to
your doctor about the best way to feed your baby if you take
Buprenorphine Sublingual Tablets. Breastfeeding is not
recommended while taking Buprenorphine Sublingual
Tablets.
Tell your doctor about all the
medicines you take, including prescription and
nonprescription medicines, vitamins and herbal supplements.
Buprenorphine Sublingual Tablets may affect the way other
medicines work, and other medicines may affect how Buprenorphine
Sublingual Tablets works. Some medicines may cause serious
or life-threatening medical problems when taken with
Buprenorphine Sublingual Tablets.
Sometimes the doses of certain medicines and
Buprenorphine Sublingual Tablets may need to be changed if
used together. Do not take any medicine while using
Buprenorphine Sublingual Tablets until you have talked with
your doctor. Your doctor will tell you if it is safe to take
other medicines while you are using Buprenorphine Sublingual
Tablets.
Be especially careful about
taking other medicines that may make you sleepy,
such as pain medicines, tranquilizers, sleeping pills,
anxiety medicines or antihistamines.
Know the medicines you take. Keep a list of them to show
your doctor and pharmacist each time you get a new medicine.
How should I take Buprenorphine Sublingual Tablets?
Always take Buprenorphine Sublingual Tablets exactly
as your doctor tells you
. Your doctor may change your dose after seeing
how it affects you. Do not change your dose unless your
doctor tells you to change it.
Do not take Buprenorphine Sublingual Tablets more
often than prescribed by your doctor.
If you are prescribed a dose of 2 or more Buprenorphine
Sublingual Tablets at the same time:
Ask your doctor for instructions on the right way
to take Buprenorphine Sublingual Tablets
Follow the same instructions every time you take a
dose of Buprenorphine Sublingual Tablets
Put the tablets under your tongue. Let them dissolve
completely.
Figure
While Buprenorphine Sublingual Tablets is
dissolving, do not chew or swallow the tablet
because the medicine will not work as well.
Talking while the tablet is dissolving can affect
how well the medicine in Buprenorphine Sublingual Tablets is absorbed.
If you miss a dose of Buprenorphine Sublingual
Tablets, take your medicine when you remember. If it
is almost time for your next dose, skip the missed
dose and take the next dose at your regular time. Do
not take 2 doses at the same time unless your doctor
tells you to. If you are not sure about your dosing,
call your doctor.
Do not stop taking Buprenorphine Sublingual
Tablets suddenly. You could become sick and have
withdrawal symptoms because your body has become
used to the medicine. Physical dependence is not the
same as drug addiction. Your doctor can tell you
more about the differences between physical
dependence and drug addiction. To have fewer
withdrawal symptoms, ask your doctor how to stop
using Buprenorphine Sublingual Tablets the right
way.
If you take too many
Buprenorphine Sublingual Tablets or
overdose, call Poison Control or get emergency
medical help right away.
What should I avoid while taking
Buprenorphine Sublingual Tablets?
Do not drive, operate heavy
machinery, or perform any other dangerous activities
until you know how this medication affects you.
Buprenorphine can cause drowsiness and slow
reaction times. This may happen more often in the first few
weeks of treatment when your dose is being changed, but can
also happen if you drink alcohol or take other sedative
drugs when you take Buprenorphine Sublingual Tablets.
You should not drink alcohol
while using Buprenorphine Sublingual Tablets,
as this can lead to loss of consciousness or death.
What are the possible side effects of
Buprenorphine Sublingual Tablets?
Buprenorphine Sublingual Tablets
can cause serious side effects including:
See "What is the most
important information I should know about Buprenorphine
Sublingual Tablets?"
Respiratory problems.
You have a higher risk of death and coma if you
take Buprenorphine Sublingual Tablets with other
medicines, such as benzodiazepines.
Sleepiness, dizziness, and
problems with coordination
Dependency or abuse
Liver problems. Call
your doctor right away if you notice any of these signs of
liver problems: Your skin or the white part of your eyes
turning yellow (jaundice), urine turning dark, stools
turning light in color, you have less of an appetite, or you
have stomach (abdominal) pain or nausea. Your doctor should
do tests before you start taking and while you take
Buprenorphine Sublingual Tablets.
Allergic reaction. You
may have a rash, hives, swelling of your face, wheezing, or
loss of blood pressure and consciousness. Call a doctor or
get emergency help right away.
Opioid withdrawal.
This can include: shaking, sweating more than normal,
feeling hot or cold more than normal, runny nose, watery
eyes, goose bumps, diarrhea, vomiting and muscle aches. Tell
your doctor if you develop any of these symptoms.
Decrease in blood
pressure. You may feel dizzy if you get up too
fast from sitting or lying down.
Common side effects of Buprenorphine
Sublingual Tablets include:
Headache
Nausea
Vomiting
Increased sweating
Constipation
Drug withdrawal syndrome
Decrease in sleep (insomnia)
Pain
Tell your doctor about any side effect that bothers you
or that does not go away.
These are not all the possible side effects of
Buprenorphine Sublingual Tablets. For more information, ask
your doctor or pharmacist.
Call your doctor for medical advice about side effects.
You may report side effects to FDA at 1-800-FDA-1088.
How should I store Buprenorphine Sublingual Tablets?
Store Buprenorphine Sublingual Tablets between 59°F and 86°F (15°C to 30°C)
Keep Buprenorphine Sublingual
Tablets in a safe place, out of the sight and reach of
children
How should I dispose of unused
Buprenorphine Sublingual Tablets?
Dispose of unused Buprenorphine Sublingual Tablets as
soon as you no longer need them.
Flush unused tablets down the toilet.
General information about the safe and
effective use of Buprenorphine Sublingual Tablets
Medicines are sometimes prescribed for purposes other
than those listed in a Medication Guide. Do not use
Buprenorphine Sublingual Tablets for a condition for which
they were not prescribed. Do not give Buprenorphine Sublingual
Tablets to other people, even if they have the same symptoms you
have. It may harm them and it is against the law.
This Medication Guide summarizes the most important
information about Buprenorphine Sublingual Tablets. If you
would like more information, talk to your doctor or pharmacist.
You can ask your doctor or pharmacist for information that is
written for healthcare professionals.
For more information call Hi-Tech Pharmacal Co., Inc. at 1-888-775-1770.
What are the ingredients in Buprenorphine Sublingual Tablets?
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