Arsenic Trioxide by is a Prescription medication manufactured, distributed, or labeled by Nexus Pharmaceuticals Inc. Drug facts, warnings, and ingredients follow.
See full prescribing information for complete boxed warning.
|Warnings and Precautions (5.3)||06/2019|
Arsenic Trioxide Injection is an arsenical indicated:
Newly-diagnosed low-risk APL:
Relapsed or refractory APL:
Injectable solution for intravenous administration supplied as 10 mg/10 ml of arsenic trioxide in single-use ampules. (3)
Hypersensitivity to arsenic. (4)
The most common adverse reactions (greater than 30%) were leukocytosis, neutropenia, thrombocytopenia, nausea, vomiting, diarrhea, abdominal pain, hepatic toxicity, fever, rigors, fatigue, insomnia, tachycardia, QTc prolongation, edema, hyperglycemia, hypokalemia, hypomagnesemia, dyspnea, cough, rash or itching, sore throat, arthralgia, headaches, paresthesia, and dizziness. (6.1)
To report SUSPECTED ADVERSE REACTIONS, contact Lambda Therapeutics Limited at 1-855-642-2597 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
See 17 for PATIENT COUNSELING INFORMATION.
Differentiation Syndrome: Patients with acute promyelocytic leukemia (APL) treated with Arsenic Trioxide Injection have experienced symptoms of differentiation syndrome, which can be fatal if not treated. Symptoms may include fever, dyspnea, acute respiratory distress, pulmonary infiltrates, pleural or pericardial effusions, weight gain or peripheral edema, hypotension, and renal, hepatic, or multi-organ dysfunction, in the presence or absence of leukocytosis. If differentiation syndrome is suspected, immediately initiate high-dose corticosteroid therapy and hemodynamic monitoring until resolution of signs and symptoms. Temporary discontinuation of Arsenic Trioxide Injection may be required [see Warnings and Precautions (5.1) and Adverse Reactions (6.1)].
Cardiac Conduction Abnormalities: Arsenic trioxide can cause QTc interval prolongation, complete atrioventricular block, and a torsade de pointes-type ventricular arrhythmia, which can be fatal. Before initiating therapy, assess the QTc interval, correct pre-existing electrolyte abnormalities, and consider discontinuing drugs known to prolong QTc interval. Do not administer Arsenic Trioxide Injection to patients with ventricular arrhythmia or prolonged QTcF [see Warnings and Precautions (5.2)].
Encephalopathy: Serious encephalopathy, including Wernicke's, has occurred in patients treated with Arsenic Trioxide Injection. Wernicke's is a neurologic emergency. Consider testing thiamine levels in patients at risk for thiamine deficiency. Administer parenteral thiamine in patients with or at risk for thiamine deficiency. Monitor patients for neurological symptoms and nutritional status while receiving Arsenic Trioxide Injection. If encephalopathy is suspected, immediately interrupt Arsenic Trioxide Injection and initiate parenteral thiamine. Monitor until symptoms resolve or improve and thiamine levels normalize [see Warnings and Precautions (5.3)].
Arsenic Trioxide Injection is indicated in combination with tretinoin for treatment of adults with newly-diagnosed low- risk acute promyelocytic leukemia (APL) whose APL is characterized by the presence of the t(15;17) translocation or PML/RAR-alpha gene expression.
Arsenic Trioxide Injection is indicated for induction of remission and consolidation in patients with APL who are refractory to, or have relapsed from, retinoid and anthracycline chemotherapy, and whose APL is characterized by the presence of the t(15;17) translocation or PML/RAR-alpha gene expression.
Newly-Diagnosed Low-Risk Acute Promyelocytic Leukemia (APL)
A treatment course for patients with newly-diagnosed low-risk APL consists of 1 induction cycle and 4 consolidation cycles.
aRounded to the nearest 10 mg increment
bOmitted during the 4th cycle of consolidation
|Induction (1 cycle)|
|Arsenic Trioxide Injection|
0 15 mg/kg once
until marrow remission but not to exceed 60 days
22.5 mg/m2 twice daily orally
until marrow remission but not to exceed 60 days
|Consolidation (4 cycles)|
|Week 1||Week 2||Week 3||Week 4||Week 5||Week 6||Week 7
|Arsenic Trioxide Injection|
0.15 mg/kg once
22.5 mg/m2 twice daily orally
Relapsed or Refractory APL
A treatment course including Arsenic Trioxide Injection monotherapy for patients with relapsed or refractory APL consists of 1 induction cycle and 1 consolidation cycle [see Clinical Studies (14.2)].
During induction therapy, monitor coagulation studies, blood counts, and chemistries at least 2-3 times per week through recovery.
During consolidation, monitor at least weekly. Management of some adverse reactions may require dose interruption, dose reduction, or permanent discontinuation of Arsenic Trioxide Injection [see Warnings and Precautions (5) and Adverse Reactions (6)]. Table 2 shows the dose modifications for toxicity due to Arsenic Trioxide Injection when used alone or in combination with tretinoin.
|Adverse Reaction(s)||Dose Modification|
|Differentiation syndrome, defined by the presence of 2 or more of the following:||
|QTc Prolongation greater than 450 msec for men or greater than 460 msec for women:||
|Hepatotoxicity, defined by 1 or more of the following:||
|Other severe or life-threatening (grade 3-4) nonhematologic reactions||
|Moderate (grade 2)|
|Leukocytosis (WBC count greater than 10 Gi/L)||
|Myelosuppression, defined by 1 or more of the following:||
*Rounded to the nearest 10 mg increment
|Arsenic Trioxide Injection
mg/kg intravenously once daily
|Tretinoin* mg/m2 orally twice daily|
Dilute Arsenic Trioxide Injection with 100 to 250 mL 5% Dextrose Injection, USP or 0.9% Sodium Chloride Injection, USP, using proper aseptic technique, immediately after withdrawal from the vial. Do not save any unused portions for later administration.
After dilution, Arsenic Trioxide Injection is chemically and physically stable when stored for 24 hours at room temperature and 48 hours when refrigerated.
Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.
Administer Arsenic Trioxide intravenously over 2 hours. The infusion duration may be extended up to 4 hours if acute vasomotor reactions are observed. A central venous catheter is not required.
The Arsenic Trioxide vial is single-dose and does not contain any preservatives. Unused portions of each vial should be discarded properly. Do not mix Arsenic Trioxide with other medications.
Differentiation syndrome, which may be life-threatening or fatal, has been observed in patients with acute promyelocytic leukemia (APL) treated with Arsenic Trioxide Injection. In clinical trials, 16-23% of patients treated with Arsenic Trioxide Injection for APL developed differentiation syndrome. Symptoms include unexplained fever, dyspnea, hypoxia, pulmonary infiltrates, pleural or pericardial effusion, weight gain, peripheral edema, hypotension, renal insufficiency, hepatopathy and multi-organ dysfunction. Differentiation syndrome has been observed with and without concomitant hyperleukocytosis, and it has occurred as early as day 1 of induction to as late as the second month induction therapy. When Arsenic Trioxide Injection is used in combination with tretinoin, prednisone prophylaxis is advised [see Dosage and Administration (2.1)].
At the first signs of differentiation syndrome, interrupt treatment with Arsenic Trioxide Injection and administer dexamethasone 10 mg intravenously twice daily. Continue high-dose steroids until signs and symptoms have abated for at least 3 days [see Dosage and Administration (2.2)].
Patients treated with Arsenic Trioxide Injection can develop QTc prolongation, torsade de pointes, and complete heart block. In the clinical trials of patients with newly-diagnosed low-risk APL treated with Arsenic Trioxide Injection in combination with tretinoin, 11% experienced QTc prolongation > 450 msec for men and > 460 msec for women throughout the treatment cycles. In the clinical trial of patients with relapsed or refractory APL treated with Arsenic Trioxide Injection monotherapy, 40% had at least one ECG tracing with a QTc interval greater than 500 msec. A prolonged QTc was observed between 1 and 5 weeks after start of Arsenic Trioxide infusion, and it usually resolved by 8 weeks after Arsenic Trioxide infusion. There are no data on the effect of Arsenic Trioxide on the QTc interval during the infusion of the drug.
The risk of torsade de pointes is related to the extent of QTc prolongation, concomitant administration of QTc prolonging drugs, a history of torsade de pointes, pre-existing QTc interval prolongation, congestive heart failure, administration of potassium-wasting diuretics, or other conditions that result in hypokalemia or hypomagnesemia. The risk may be increased when Arsenic Trioxide Injection is coadministered with medications that can lead to electrolyte abnormalities (such as diuretics or amphotericin B) [see Drug Interactions (7)].
Prior to initiating therapy with Arsenic Trioxide Injection, assess the QTc interval by electrocardiogram, correct pre- existing electrolyte abnormalities, and consider discontinuing drugs known to prolong QTc interval. Do not administer Arsenic Trioxide Injection to patients with ventricular arrhythmia or prolonged QTc. If possible, discontinue drugs that are known to prolong the QTc interval. If it is not possible to discontinue the interacting drug, perform cardiac monitoring frequently [see Drug Interactions (7)]. During Arsenic Trioxide Injection therapy, maintain potassium concentrations above 4 mEq/L and magnesium concentrations above 1.8 mg/dL. Monitor ECG weekly, and more frequently for clinically unstable patients.
For patients who develop a QTc greater than 500 msec, immediately withhold treatment with Arsenic Trioxide Injection and any medication known to prolong the QTc interval. Correct electrolyte abnormalities. When the QTc normalizes, resume Arsenic Trioxide Injection at a reduced dose [see Dosage and Administration (2.2)].
Serious encephalopathies were reported in patients receiving Arsenic Trioxide Injection. Monitor patients for neurological symptoms such as confusion, decreased level of consciousness, seizures, cognitive deficits, ataxia, visual symptoms and ocular motor dysfunction. Advise patients and caregivers of the need for close observation.
Wernicke's encephalopathy occurred in patients receiving Arsenic Trioxide Injection. Wernicke's encephalopathy is a neurologic emergency that can be prevented and treated with thiamine. Consider testing thiamine levels in patients at risk for thiamine deficiency (e.g., chronic alcohol use, malabsorption, nutritional deficiency, concomitant use of furosemide). Administer parenteral thiamine in patients with or at risk for thiamine deficiency. Monitor patients for neurological symptoms and nutritional status while receiving Arsenic Trioxide Injection. If Wernicke's encephalopathy is suspected, immediately interrupt Arsenic Trioxide Injection and initiate parenteral thiamine.
In the clinical trials, 44% of patients with newly-diagnosed low-risk APL treated with Arsenic Trioxide Injection in combination with tretinoin experienced elevated aspartate aminotransferase (AST), alkaline phosphatase, and/or serum bilirubin. These abnormalities resolved with temporary discontinuation of Arsenic Trioxide Injection and/or tretinoin. During treatment with Arsenic Trioxide Injection, monitor liver chemistries at least 2-3 times per week through recovery from toxicities. Withhold treatment with Arsenic Trioxide Injection and/or tretinoin if elevations in AST), alkaline phosphatase, and/or serum bilirubin occur to greater than 5 times the upper limit of normal [see Dosage and Administration (2.2)].
Long-term liver abnormalities can occur in APL patients treated with Arsenic Trioxide Injection in combination with tretinoin. In a published series, mild liver dysfunction and hepatic steatosis were seen in 15% and 43%, respectively, of patients at a median of 7 years (range 0-14 years) after treatment with arsenic trioxide in combination with tretinoin.
The active ingredient of Arsenic Trioxide Injection, arsenic trioxide, is a human carcinogen. Monitor patients for the development of second primary malignancies.
Arsenic Trioxide Injection can cause fetal harm when administered to a pregnant woman. Arsenic Trioxide Injection was embryolethal and teratogenic in rats when administered on gestation day 9 at a dose approximately 10 times the recommended human daily dose on a mg/m² basis. A related trivalent arsenic, sodium arsenite, produced teratogenicity when administered during gestation in mice at a dose approximately 5 times the projected human dose on a mg/m² basis and in hamsters at an intravenous dose approximately equivalent to the projected human daily dose on a mg/m² basis. Advise pregnant women of the potential risk to a fetus. Advise females and males of reproductive potential to use effective contraception during and after treatment with Arsenic Trioxide Injection [see Use in Specific Populations (8.1, 8.3)].
The following clinically significant adverse reactions are described elsewhere in the labeling.
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.
Newly-Diagnosed Low-Risk APL
The safety evaluation of Arsenic Trioxide Injection in combination with tretinoin is based on results from a randomized trial comparing Arsenic Trioxide Injection plus tretinoin (n=129) versus chemotherapy plus tretinoin (n=137) in patients with newly-diagnosed APL (Study APL0406) [see Clinical Studies (14.1)]. In the Arsenic Trioxide Injection/tretinoin group, 98% of patients completed induction therapy and 89% completed at least three consolidation cycles. In the chemotherapy/tretinoin group, 96% completed induction therapy and 87% patients completed all three courses of consolidation therapy.
Fatal adverse reactions were reported in 1 (1%) patient on the Arsenic Trioxide/tretinoin arm and 8 (6%) patients on the chemotherapy/tretinoin arm. Arsenic Trioxide Injection/tretinoin was discontinued due to toxicity in 1 patient during induction and in 4 patients during the first three consolidation courses, whereas chemotherapy/tretinoin was discontinued due to toxicity in 4 patients during induction and in 6 patients during consolidation. Serious adverse reactions reported in 25% on the Arsenic Trioxide Injection/ tretinoin arm and 24% on the chemotherapy/tretinoin arm. The serious adverse reactions reported in ≥ 2% of patients receiving Arsenic Trioxide Injection/tretinoin were abnormal liver tests, differentiation syndrome, dyspnea, pneumonia, and other infections.
Selected hematologic and nonhematologic toxicities that occurred during induction or consolidation are presented in Table 4 for the 129 patients treated with Arsenic Trioxide plus tretinoin and the 137 patients treated with chemotherapy plus tretinoin.
*Mostly cases of reversible peripheral neuropathy
|Induction n (%)||First Consolidation n (%)||Second Consolidation n (%)||Third Consolidation n (%)|
|Thrombocytopenia > 15 days|
|Arsenic Trioxide Injection /tretinoin||74 (58%)||6 (5%)||6 (5%)||8 (7%)|
|Chemotherapy/tretinoin||120 (88%)||17 (14%)||77 (63%)||26 (22%)|
|Neutropenia >15 days (Grade|
|Arsenic Trioxide Injection /tretinoin||61 (48%)||8 (7%)||7 (6%)||5 (4%)|
|Chemotherapy/tretinoin||109 (80%)||40 (32%)||90 (73%)||28 (24%)|
|Hepatic toxicity (Grade 3-4)|
|Arsenic Trioxide Injection /tretinoin||51 (40%)||5 (4%)||1 (1%)||0 (0%)|
|Chemotherapy/tretinoin||4 (3%)||1 (1%)||0 (0%)||0 (0%)|
|Infection and fever of|
|Arsenic Trioxide Injection /tretinoin||30 (23%)||10 (8%)||4 (3%)||2 (2%)|
|Chemotherapy/tretinoin||75 (55%)||8 (6%)||46 (38%)||2 (2%)|
|Arsenic Trioxide Injection /tretinoin||29 (22%)||22 (18%)||17 (14%)||16 (14%)|
|Chemotherapy/tretinoin||29 (22%)||19 (15%)||10 (8%)||13 (11%)|
|Arsenic Trioxide Injection /tretinoin||14 (10%)||19 (16%)||19 (16%)||16 (14%)|
|Chemotherapy/tretinoin||12 (9%)||12 (10%)||12 (10%)||11 (9%)|
|Arsenic Trioxide Injection /tretinoin||11 (9%)||3 (2%)||3 (2%)||2 (2%)|
|Chemotherapy/tretinoin||1 (1%)||0 (0%)||0 (0%)||0 (0%)|
|Arsenic Trioxide Injection /tretinoin||3 (2%)||0 (0%)||0 (0%)||0 (0%)|
|Chemotherapy/tretinoin||25 (18%)||1 (1%)||6 (5%)||0 (0%)|
|Arsenic Trioxide Injection /tretinoin||1 (1%)||5 (4%)||6 (5%)||7 (6%)|
|Chemotherapy/tretinoin||0 (0%)||0 (0%)||0 (0%)||0 (0%)|
|Cardiac function (Grade 3-4)|
|Arsenic Trioxide Injection /tretinoin||0 (0%)||0 (0%)||0 (0%)||0 (0%)|
|Chemotherapy/tretinoin||5 (4%)||0 (0%)||0 (0%)||0 (0%)|
Relapsed or Refractory APL
Safety information was available for 52 patients with relapsed or refractory APL who participated in clinical trials of Arsenic Trioxide Injection. Forty patients in the Phase 2 study received the recommended dose of 0.15 mg/kg, of whom 28 completed both induction and consolidation treatment cycles. An additional 12 patients with relapsed or refractory APL received doses generally similar to the recommended dose. Most patients experienced some drug-related toxicity, most commonly leukocytosis, gastrointestinal (nausea, vomiting, diarrhea, and abdominal pain), fatigue, edema, hyperglycemia, dyspnea, cough, rash or itching, headaches, and dizziness. These adverse effects have not been observed to be permanent or irreversible nor do they usually require interruption of therapy.
SAEs, Grade ≥3 according to version 2 of the NCI Common Toxicity Criteria, were common. Those
SAEs attributed to Arsenic Trioxide Injection in the Phase 2 study of 40 patients with refractory or relapsed APL included APL differentiation syndrome (n=3), hyperleukocytosis (n=3), QTc interval ≥ 500 msec (n=16, 1 with torsade de pointes), atrial dysrhythmias (n=2), and hyperglycemia (n=2).
Table 5 describes the adverse reactions that were observed in ≥ 5% patients, between the ages of 5-73 years, treated for APL with Arsenic Trioxide Injection at the recommended dose. Similar adverse reactions profiles were seen in the other patient populations who received Arsenic Trioxide Injection.
Body System Adverse reaction
|Any Grade Adverse Reactions||Grade ≥3 Adverse Reactions|
|Abdominal pain (lower & upper)||23||58||4||10|
|Post nasal drip||5||13|
|Decreased breath sounds||4||10|
|General disorders and administration site conditions|
|Edema - non-specific||16||40|
|Injection site pain||8||20|
|Pain - non-specific||6||15||1||3|
|Injection site erythema||5||13|
|Injection site edema||4||10|
|Nervous system disorders|
|Dizziness (excluding vertigo)||9||23|
|ECG QT corrected interval prolonged|
> 500 msec
|ECG abnormal other than QT interval prolongation||3||8|
|Metabolism and nutrition
|Disseminated intravascular coagulation||3||8||3||8|
|Skin and subcutaneous tissue disorders|
|Erythema - non-specific||5||13|
|Non-specific skin lesions||3||8|
|Musculoskeletal, connective tissue, and bone disorders|
|Pain in limb||5||13||2||5|
|Infections and infestations|
|Upper respiratory tract infection||5||13||1||3|
|Bacterial infection - non-|
|Reproductive system disorders|
|Painful red eye||2||5|
|Renal and urinary disorders|
Leukocytosis : Arsenic Trioxide Injection in combination with tretinoin can induce proliferation of leukemic promyelocytes resulting in a rapid increase in white blood cell count. Leukocytosis greater than 10 Gi/L developed during induction therapy in 43% patients receiving Arsenic Trioxide Injection/tretinoin for newly- diagnosed low-risk APL and in 50% of patients receiving Arsenic Trioxide monotherapy for relapsed/refractory APL. In the relapsed/refractory setting, a relationship did not exist between baseline WBC counts and development of hyperleukocytosis nor baseline WBC counts and peak WBC counts.
Hyperleukocytosis due to Arsenic Trioxide Injection may warrant treatment with hydroxyurea [see Dosage and Administration (2.2)].
The following reactions have been reported from clinical trials and/or worldwide postmarketing surveillance. Because they are voluntarily reported from a population of unknown size, precise estimates of frequency or causal relationship to drug exposure cannot always be made.
Cardiac disorders: Ventricular extrasystoles in association with QT prolongation, ventricular tachycardia in association with QT prolongation, including torsade de pointes, atrioventricular block, and congestive heart failure
Nervous system disorders: Peripheral neuropathy, paresis, seizures, confusion, encephalopathy, Wernicke's encephalopathy, posterior reversible encephalopathy syndrome
Hematologic disorders: Pancytopenia, bone marrow necrosis
Infections and infestations: Herpes zoster
Investigations: Gamma-glutamyltransferase increased
Musculoskeletal and connective tis sue disorders: Bone pain, myalgia, rhabdomyolysis
Respiratory, thoracic, and mediastinal disorders: Differentiation syndrome, like retinoic acid syndrome, has been reported with the use of Arsenic Trioxide Injection for the treatment of malignancies other than APL.
Ear and labyrinth disorders: Deafness
Neoplasms benign, malignant and unspecified: Melanoma, pancreatic cancer, squamous cell carcinoma
Skin and subcutaneous tissue disorders: Toxic epidermal necrolysis
Drugs That Can Prolong the QT/QTc Interval
Concomitant use of these drugs and Arsenic Trioxide Injection may increase the risk of serious QT/QTc interval prolongation. Discontinue or replace with an alternative drug that does not prolong the QT/QTc interval while patient is using Arsenic Trioxide Injection. Monitor ECGs more frequently in patients when it is not feasible to avoid concomitant use.
Drugs That Can Lead to Electrolyte Abnormalities
Electrolyte abnormalities increase the risk of serious QT/QTc interval prolongation. Avoid concomitant administration of drugs that can lead to electrolyte abnormalities. Monitor electrolytes more frequently in patients who must receive concomitant use of these drugs and Arsenic Trioxide Injection.
Drugs That Can Lead to Hepatotoxicity
Concomitant use of these drugs and Arsenic Trioxide Injection, particularly when given in combination with tretinoin, may increase the risk of serious hepatotoxicity. Discontinue or replace with an alternative drug that does not cause hepatotoxicity while the patient is using Arsenic Trioxide Injection. Monitor liver function tests more frequently in patients when it is not feasible to avoid concomitant use.
Based on the mechanism of action [see Clinical Pharmacology (12.1)] and findings in animal studies, Arsenic Trioxide Injection can cause fetal harm when administered to a pregnant woman. Arsenic trioxide was embryolethal and teratogenic in rats when administered on gestation day 9 at a dose approximately 10 times the recommended human daily dose on a mg/m² basis (see Data). A related trivalent arsenic, sodium arsenite, produced teratogenicity when administered during gestation in mice at a dose approximately 5 times the projected human dose on a mg/m² basis and in hamsters at an intravenous dose approximately equivalent to the projected human daily dose on a mg/m² basis. There are no studies with the use of Arsenic Trioxide Injection in pregnant women, and limited published data on arsenic trioxide use during pregnancy are insufficient to inform a drug-associated risk of major birth defects and miscarriage.
Advise pregnant women of the potential risk to a fetus.
The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.
One patient was reported to deliver a live infant with no reported congenital anomalies after receiving arsenic trioxide during the first five months of pregnancy. A second patient became pregnant three months after discontinuing arsenic trioxide and was reported to have a normal pregnancy outcome. A third patient was a pregnant healthcare provider who experienced dermal contact with liquid arsenic trioxide and had a normal pregnancy outcome after treatment and monitoring. A fourth patient who became pregnant while receiving arsenic trioxide had a miscarriage.
Studies in pregnant mice, rats, hamsters, and primates have shown that inorganic arsenicals cross the placental barrier when given orally or by injection. An increase in resorptions, neural-tube defects, anophthalmia and microphthalmia were observed in rats administered 10 mg/kg of arsenic trioxide on gestation day 9 (approximately 10 times the recommended human daily dose on a mg/m² basis). Similar findings occurred in mice administered a 10 mg/kg dose of a related trivalent arsenic, sodium arsenite (approximately 5 times the projected human dose on a mg/m² basis), on gestation days 6, 7, 8, or 9.
Intravenous injection of 2 mg/kg sodium arsenite (approximately equivalent to the projected human daily dose on a mg/m² basis) on gestation day 7 (the lowest dose tested) resulted in neural-tube defects in hamsters.
Arsenic trioxide is excreted in human milk. There is no information on the effects of arsenic trioxide on the breastfed child or on milk production. Because of the potential for serious adverse reactions in a breastfed child from Arsenic Trioxide Injection, discontinue breastfeeding during treatment with Arsenic Trioxide Injection and for two weeks after the final dose.
Arsenic Trioxide Injection can cause fetal harm when administered to a pregnant woman. Conduct pregnancy testing in females of reproductive potential prior to initiation of treatment with Arsenic Trioxide Injection [see Use in Specific Populations (8.1)].
Advise females of reproductive potential to use effective contraception during and after treatment with Arsenic Trioxide Injection and for six months after the final dose.
Based on testicular toxicities including decreased testicular weight and impaired spermatogenesis observed in animal studies, Arsenic Trioxide may impair fertility in males of reproductive potential [see Nonclinical Toxicology (13.1)].
The safety and efficacy of Arsenic Trioxide Injection in combination with tretinoin in pediatric patients has not been established.
The safety and efficacy of Arsenic Trioxide Injection as a single agent for treatment of pediatric patients with relapsed or refractory APL is supported by the pivotal phase 2 study in 40 patients with relapsed or refractory APL. Five patients below the age of 18 years (age range: 5 to 16 years) were treated with Arsenic Trioxide Injection at the recommended dose of 0.15 mg/kg/day. A literature review included an additional 17 patients treated with arsenic trioxide for relapsed or refractory APL, with ages ranging from 4 to 21 years. No differences in efficacy and safety were observed by age.
Use of Arsenic Trioxide Injection in combination with tretinoin in newly-diagnosed adult patients with low-risk APL is supported by a randomized, controlled trial that included 16 patients between the ages of 60 and 70 years. No differences in efficacy and safety were observed by age. A literature review included an additional 77 patients treated with arsenic trioxide in combination with tretinoin as part of induction and consolidation therapy for low and high risk APL, with ages ranging from 60 to 84 years. These studies showed lower survival rates in older patients. Monitor elderly patients frequently during treatment with Arsenic Trioxide Injection.
The safety and efficacy of Arsenic Trioxide Injection as a single agent in older patients with relapsed or refractory APL is supported by the pivotal phase 2 study in 40 patients with relapsed or refractory APL. Six patients age 65 and above (age range: 65 to 73 years) were treated with Arsenic Trioxide Injection at the recommended dose. A literature review included an additional 4 patients treated with arsenic trioxide for relapsed or refractory APL with ages ranging from 69 to 72 years. No differences in efficacy and safety were observed by age.
Exposure of arsenic trioxide may be higher in patients with severe renal impairment [see Clinical Pharmacology (12.3)]. Patients with severe renal impairment (creatinine clearance less than 30 mL/min) should be monitored for toxicity when these patients are treated with Arsenic Trioxide Injection, and a dose reduction may be warranted.
The use of Arsenic Trioxide Injection in patients on dialysis has not been studied.
Since limited data are available across all hepatic impairment groups, caution is advised in the use of Arsenic Trioxide Injection in patients with hepatic impairment [see Clinical Pharmacology (12.3)]. Monitor patients with severe hepatic impairment (Child-Pugh Class C) who are treated with Arsenic Trioxide Injection for toxicity.
Manifestations of Arsenic Trioxide Injection overdosage include convulsions, muscle weakness, and confusion.
If symptoms of Arsenic Trioxide Injection overdosage develop, the injection should be immediately discontinued and chelation therapy should be considered.
A conventional protocol for acute arsenic intoxication includes dimercaprol administered at a dose of 3 mg/kg intramuscularly every 4 hours until immediate life-threatening toxicity has subsided. Thereafter, penicillamine at a dose of 250 mg orally, up to a maximum frequency of four times per day (≤ 1 g per day), may be given.
Arsenic Trioxide Injection is a sterile injectable solution of arsenic trioxide. The molecular formula of the drug substance in the solid state is As2O3, with a molecular weight of 197.8 and has the following structural formula:
Arsenic Trioxide is available in 10 mL, single-use vials containing 10 mg of arsenic trioxide. Arsenic Trioxide is formulated as a sterile, nonpyrogenic, clear solution of arsenic trioxide in water for injection using sodium hydroxide and dilute hydrochloric acid to adjust to pH 8. Arsenic Trioxide Injection is preservative-free. Arsenic trioxide, the active ingredient, is present at a concentration of 1.0 mg/mL. Inactive ingredients and their respective approximate concentrations are sodium hydroxide (1.2 mg/mL) and hydrochloric acid, which is used to adjust the pH to 7.5 - 8.5.
The mechanism of action of Arsenic Trioxide Injection is not completely understood. Arsenic trioxide causes morphological changes and DNA fragmentation characteristic of apoptosis in NB4 human promyelocytic leukemia cells in vitro. Arsenic trioxide also causes damage or degradation of the fusion protein promyelocytic leukemia (PML)-retinoic acid receptor (RAR)-alpha.
A dedicated QTc study was not performed with Arsenic Trioxide Injection. However, in a single-arm trial of Arsenic Trioxide Injection (0.15 mg/kg daily), 16 of 40 patients (40%) had a QTc interval greater than 500 msec. Prolongation of the QTc was observed between 1 and 5 weeks after Arsenic Trioxide Injection infusion, and then returned towards baseline by the end of 8 weeks after Arsenic Trioxide Injection infusion.
The inorganic, lyophilized form of arsenic trioxide, when placed into solution, immediately forms the hydrolysis product arsenious acid (AsIII). AsIII is the pharmacologically active species of arsenic trioxide. Monomethylarsonic acid (MMAV), and dimethylarsinic acid (DMAV) are the main pentavalent metabolites formed during metabolism, in addition to arsenic acid (AsV) a product of AsIII oxidation. The pharmacokinetics of arsenical species ([AsIII], [AsV], [MMAV], [DMAV]) were determined in 6 APL patients following once-daily doses of 0.15 mg/kg for 5 days per week. Over the total single-dose range of 7 to 32 mg (administered as 0.15 mg/kg), systemic exposure (AUC) appears to be linear. Peak plasma concentrations of arsenious acid (AsIII), the primary active arsenical species were reached at the end of infusion (2 hours). Plasma concentration of AsIII declined in a biphasic manner with a mean elimination half-life of 10 to 14 hours and is characterized by an initial rapid distribution phase followed by a slower terminal elimination phase. The daily exposure to AsIII (mean AUC0-24) was 194 ng·hr/mL (n=5) on Day 1 of Cycle 1 and 332 ng·hr/mL (n=6) on Day 25 of Cycle 1, which represents an approximate 2-fold accumulation. The primary pentavalent metabolites, MMAV and DMAV, are slow to appear in plasma (approximately 10-24 hours after first administration of arsenic trioxide), but, due to their longer half-life, accumulate more upon multiple dosing than does AsIII. The mean estimated terminal elimination half-lives of the metabolites MMAV and DMAV are 32 hours and 72 hours, respectively. Approximate accumulation ranged from 1.4- to 8-fold following multiple dosing as compared to single-dose administration. AsV is present in plasma only at relatively low levels.
The volume of distribution (Vss) for AsIII is large (mean 562 L, N=10) indicating that AsIII is widely distributed throughout body tissues. Vss is also dependent on body weight and increases as body weight increases.
Much of the AsIII is distributed to the tissues where it is methylated to the less cytotoxic metabolites, monomethylarsonic acid (MMAV) and dimethylarsinic acid (DMAV) by methyltransferases primarily in the liver. The metabolism of arsenic trioxide also involves oxidation of AsIII to AsV, which may occur in numerous tissues via enzymatic or nonenzymatic processes. AsV is present in plasma only at relatively low levels following administration of arsenic trioxide.
Approximately 15% of the administered Arsenic Trioxide dose is excreted in the urine as unchanged AsIII. The methylated metabolites of AsIII (MMAV, DMAV) are primarily excreted in the urine. The total clearance of AsIII is 49 L/h and the renal clearance is 9 L/h. Clearance is not dependent on body weight or dose administered over the range of 7-32 mg.
Patients with Renal Impairment
The effect of renal impairment on the pharmacokinetics of AsIII, AsV, and the pentavalent metabolites MMAV and DMAV was evaluated in 20 patients with advanced malignancies. Patients were classified as having normal renal function (creatinine clearance [CrCl] > 80 mL/min, n=6), mild renal impairment (CrCl 50-80 mL/min, n=5), moderate renal impairment (CrCl 30-49 mL/min, n=6), or severe renal impairment (CrCl < 30 mL/min, n=3). Following twice-weekly administration of 0.15 mg/kg over a 2- hour infusion, the mean AUC0-∞ for AsIII was comparable among the normal, mild and moderate renal impairment groups. However, in the severe renal impairment group, the mean AUC0-∞ for AsIII was approximately 48% higher than that in the normal group.
Systemic exposure to MMAV and DMAV tended to be larger in patients with renal impairment; however, the clinical consequences of this increased exposure are not known. AsV plasma levels were generally below the limit of assay quantitation in patients with impaired renal function [see Use in Specific Populations (8.6)]. The use of arsenic trioxide in patients on dialysis has not been studied.
Patients with Hepatic Impairment
The effect of pharmacokinetics of AsIII, AsV, and the pentavalent metabolites MMAV and DMAV was evaluated following administration of 0.25-0.50 mg/kg of arsenic trioxide in patients with hepatocellular carcinoma. Patients were classified as having normal hepatic function (n=4), mild hepatic impairment (Child-Pugh class A, n=12), moderate hepatic impairment (Child-Pugh class B, n=3), or severe hepatic impairment (Child-Pugh class C, n=1). No clear trend toward an increase in systemic exposure to AsIII, AsV, MMAV or DMAV was observed with decreasing level of hepatic function as assessed by dose-normalized (per mg dose) AUC in the mild and moderate hepatic impairment groups. However, the one patient with severe hepatic impairment had mean dose-normalized AUC0D24 and Cmax values 40% and 70% higher, respectively, than those patients with normal hepatic function. The mean dose-normalized trough plasma levels for both MMAV and DMAV in this severely hepatically impaired patient were 2.2-fold and 4.7-fold higher, respectively, than those in the patients with normal hepatic function [see Use in Specific Populations (8.7)].
Following IV administration of 0.15 mg/kg/day of arsenic trioxide in 10 APL patients (median age = 13.5 years, range 4-20 years), the daily exposure to AsIII (mean AUC0-24h) was 317 ng·hr/mL on Day 1 of Cycle 1 [see Use in Specific Populations (8.4)].
Drug Interaction Studies
No formal assessments of pharmacokinetic drug-drug interactions between Arsenic Trioxide Injection and other drugs have been conducted. The methyltransferases responsible for metabolizing arsenic trioxide are not members of the cytochrome P450 family of isoenzymes. In vitro incubation of arsenic trioxide with human liver microsomes showed no inhibitory activity on substrates of the major cytochrome P450 (CYP) enzymes such as 1A2, 2A6, 2B6, 2C8, 2C9, 2C19, 2D6, 2E1, 3A4/5, and 4A9/11. The
pharmacokinetics of drugs that are substrates for these CYP enzymes are not expected to be affected by concomitant treatment with arsenic trioxide.
Carcinogenicity studies have not been conducted with Arsenic Trioxide Injection by intravenous administration [see Warnings and Precautions (5.6)].
Arsenic trioxide and trivalent arsenite salts have not been demonstrated to be mutagenic to bacteria, yeast, or mammalian cells. Arsenite salts are clastogenic in vitro (human fibroblast, human lymphocytes, Chinese hamster ovary cells, Chinese hamster V79 lung cells). Trivalent arsenic was genotoxic in the chromosome aberrations assay and micronucleus bone marrow assay in mice.
The effect of arsenic on fertility has not been adequately studied in humans. Decreased testicular weight and impaired spermatogenesis have been reported in animal studies. Male Wistar rat pups were administered 1.5 mg/kg sodium arsenite solution via the intraperitoneal route from postnatal days 1 to 14 and testes were collected for evaluation on postnatal days 15, 21, and 50. Results of this study revealed an altered morphology of the seminiferous tubules along with degeneration of spermatogenic cells, increased number of sperm with abnormal morphology, and decreased sperm counts. In beagle dogs administered intravenous arsenic trioxide for 90 days, reduced inner cell layers within seminiferous tubules and significantly decreased numbers of spermatocytes, spermatozoa, and sperm cells were observed at doses of 1 mg/kg/day and higher. The 1 mg/kg/day dose is approximately 3 times the recommended human daily dose on a mg/m² basis.
Arsenic Trioxide in combination with tretinoin was investigated in Study APL0406 (NCT00482833), a multicenter, randomized, open-label trial in patients with newly-diagnosed low-risk APL (white blood cell count at diagnosis ≤10 Gi/L). The patients were randomized 1:1 to receive Arsenic Trioxide/tretinoin for induction and consolidation or chemotherapy/tretinoin for induction, consolidation, and maintenance.
Patients in the Arsenic Trioxide Injection/tretinoin group received induction treatment with Arsenic Trioxide Injection 0.15 mg/kg intravenously once daily in combination with tretinoin 22.5 mg/m2 (rounded to the nearest 10 mg increment) orally twice daily until hematologic complete remission (CR) or for a maximum of 60 days. Patients in this group who achieved a CR during induction received four 8-week cycles of consolidation treatment with Arsenic Trioxide 0.15 mg/kg intravenously once daily for 5 days every week during weeks 1-4 of the 8-week cycle, in combination with tretinoin 22.5 mg/m2 (rounded to the nearest 10 mg increment) orally twice daily during weeks 1-2 and 5-6 of the 8-week cycle. Tretinoin was omitted during weeks 5-6 of the last cycle.
Patients in the chemotherapy/tretinoin group received idarubicin 12 mg/m2 intravenously once daily on days 2, 4, 6, and 8 in combination with tretinoin 22.5 mg/m2 (rounded to the nearest 10 mg increment) orally twice daily, starting on day 1, until hematologic CR or for a maximum of 60 days. Patients in this group who achieved a CR during induction received consolidation and maintenance treatment with tretinoin in combination with chemotherapy.
The trial enrolled 162 patients with a morphologic diagnosis of APL. The median age of patients was 45 years in the Arsenic Trioxide/tretinoin arm and 47 years in the chemotherapy/tretinoin arm, and 52% and 46% were male in the Arsenic Trioxide/tretinoin and chemotherapy/tretinoin arms, respectively. Baseline characteristics were balanced between treatment arms, including median WBC count, platelet count, PML-RARA isoform, and FLT3-ITD status.
Efficacy was based on event-free survival (EFS) rate at 2 years. EFS was defined as the time from randomization to the occurrence of treatment failure, defined as no achievement of CR or CRi after induction therapy, no achievement of molecular remission after 3 consolidation courses, molecular relapse, hematologic relapse, or death. The primary analysis of EFS was based on the difference between the two treatment arms in patients achieving EFS at 2 years. With a median follow-up of 34.4 months, the 2 year EFS rate of the modified ITT (mITT) population (patients who received at least one dose of the assigned treatment) was 94% in the Arsenic Trioxide/tretinoin arm (n=77) versus 82% in the chemotherapy/tretinoin arm (n=79), a treatment difference of 11% (95% CI: 1, 22; p-value 0.048).
Overall survival (OS) for the mITT population was 99% (95% CI: 93, 100) in the Arsenic Trioxide/tretinoin arm versus 91% (95% CI: 86, 97) in the chemotherapy/tretinoin arm. The difference in 2-year OS rate between the arms was 8% (95% CI: 0, 16).
Figure 1: Event-Free Survival for Newly-Diagnosed APL
The number of patients in the plot is based on the mITT population.
Arsenic Trioxide Injection has been investigated in Study PLRXAS01, an open-label, single-arm trial in 40 relapsed or refractory APL patients, previously treated with an anthracycline and a retinoid regimen. Patients received Arsenic Trioxide Injection 0.15 mg/kg/day intravenously over 1 to 2 hours until the bone marrow was cleared of leukemic cells or up to a maximum of 60 days. The CR (absence of visible leukemic cells in bone marrow and peripheral recovery of platelets and white blood cells with a confirmatory bone marrow ≥ 30 days later) rate in this population of previously treated patients was 28 of 40 (70%).
Among the 22 patients who had relapsed less than one year after treatment with tretinoin, there were 18 complete responders (82%). Of the 18 patients receiving Arsenic Trioxide Injection ≥ one year from tretinoin treatment, there were 10 complete responders (55%). The median time to bone marrow remission was 44 days and to onset of CR was 53 days. Three of 5 children, 5 years or older, achieved CR. No children less than 5 years old were treated.
Three to six weeks following bone marrow remission, 31 patients received consolidation therapy with Arsenic Trioxide Injection, at the same dose, for 25 additional days over a period up to 5 weeks. In follow-up treatment, 18 patients received further Arsenic Trioxide Injection as a maintenance course. Fifteen patients had bone marrow transplants. At last follow-up, 27 of 40 patients were alive with a median follow-up time of 484 days (range 280 to 755) and 23 of 40 patients remained in complete response with a median follow-up time of 483 days (range 280 to 755).
Cytogenetic conversion to no detection of the APL chromosome rearrangement was observed in 24 of 28 (86%) patients who met the response criteria defined above, in 5 of 5 (100%) patients who met some, but not all, of the response criteria, and 3 of 7 (43%) of patients who did not respond. RT-PCR conversions to no detection of the APL gene rearrangement were demonstrated in 22 of 28 (79%) of patients who met the response criteria, in 3 of 5 (60%) of patients who met some, but not all, of the response criteria, and in 2 of 7 (29%) of patients who did not respond.
Responses were seen across all age groups tested, ranging from 6 to 72 years. The ability to achieve a CR was similar for both genders. There were insufficient patients of Black, Hispanic, or Asian derivation to estimate relative response rates in these groups, but responses were seen in members of each group.
Arsenic Trioxide Injection is supplied as a sterile, clear, colorless solution in 10 mL glass, single-use vials.
NDC 14789-600-10 10 mg/10 mL (1 mg/mL) vial in packages of ten vials.
Manufactured in Belgium for
Nexus Pharmaceuticals, Inc.
Lincolnshire, Illinois 60069
Carton NDC 14789-600-10
Vial NDC 14789-600-07
Arsenic Trioxide Injection
10 X 10 mL Vials
10 mg/10 mL (1 mg/mL) For Intravenous Use Only
Revised by Nexus Pharmaceuticals, Inc. 02/2020PIARSR001
arsenic trioxide injection
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