General
The lowest possible dose of corticosteroids should be used to
control the condition under treatment. When reduction in dosage is possible, the
reduction should be gradual.
Since complications of treatment with corticosteroids are dependent on the
size of the dose and the duration of treatment, a risk/benefit decision must be
made in each individual case as to dose and duration of treatment and as to
whether daily or intermittent therapy should be used.
Kaposi's sarcoma has been reported to occur in patients receiving
corticosteroid therapy, most often for chronic conditions. Discontinuation of
corticosteroids may result in clinical improvement.
Cardio-Renal
As sodium retention with resultant edema and potassium loss may
occur in patients receiving corticosteroids, these agents should be used with
caution in patients with congestive heart failure, hypertension, or renal
insufficiency.
Endocrine
Drug-induced secondary adrenocortical insufficiency may be
minimized by gradual reduction of dosage. This type of relative insufficiency
may persist for months after discontinuation of therapy; therefore, in any
situation of stress occurring during that period, hormone therapy should be
reinstituted. Since mineralocorticoid secretion may be impaired, salt and/or a
mineralocorticoid should be administered concurrently.
Gastrointestinal
Steroids should be used with caution in active or latent peptic
ulcers, diverticulitis, fresh intestinal anastomoses, and nonspecific ulcerative
colitis, since they may increase the risk of a perforation.
Signs of peritoneal irritation following gastrointestinal perforation in
patients receiving corticosteroids may be minimal or absent.
There is an enhanced effect due to decreased metabolism of corticosteroids in
patients with cirrhosis.
Musculoskeletal
Corticosteroids decrease bone formation and increase bone
resorption both through their effect on calcium regulation (i.e., decreasing
absorption and increasing excretion) and inhibition of osteoblast function.
This, together with a decrease in the protein matrix of the bone secondary to an
increase in protein catabolism, and reduced sex hormone production, may lead to
inhibition of bone growth in pediatric patients and the development of
osteoporosis at any age. Special consideration should be given to patients at
increased risk of osteoporosis (e.g., postmenopausal women) before initiating
corticosteroid therapy.
Neuro-Psychiatric
Although controlled clinical trials have shown corticosteroids to
be effective in speeding the resolution of acute exacerbations of multiple
sclerosis, they do not show that they affect the ultimate outcome or natural
history of the disease. The studies do show that relatively high doses of
corticosteroids are necessary to demonstrate a significant effect. (See DOSAGE AND
ADMINISTRATION.)
An acute myopathy has been observed with the use of high doses of
corticosteroids, most often occurring in patients with disorders of
neuromuscular transmission (e.g., myasthenia gravis), or in patients receiving
concomitant therapy with neuromuscular blocking drugs (e.g., pancuronium). This
acute myopathy is generalized, may involve ocular and respiratory muscles, and
may result in quadriparesis. Elevation of creatinine kinase may occur. Clinical
improvement or recovery after stopping corticosteroids may require weeks to
years.
Psychic derangements may appear when corticosteroids are used, ranging from
euphoria, insomnia, mood swings, personality changes, and severe depression, to
frank psychotic manifestations. Also, existing emotional instability or
psychotic tendencies may be aggravated by corticosteroids.
Ophthalmic
lntraocular pressure may become elevated in some individuals. If
steroid therapy is continued for more than 6 weeks, intraocular pressure should
be monitored.
Information for Patients
Patients should be warned not to discontinue the use of
corticosteroids abruptly or without medical supervision. As prolonged use may
cause adrenal insufficiency and make patients dependent on corticosteroids, they
should advise any medical attendants that they are taking corticosteroids and
they should seek medical advice at once should they develop an acute illness
including fever or other signs of infection. Following prolonged therapy,
withdrawal of corticosteroids may result in symptoms of the corticosteroid
withdrawal syndrome including, myalgia, arthralgia, and malaise.
Persons who are on corticosteroids should be warned to avoid exposure to
chickenpox or measles. Patients should also be advised that if they are exposed,
medical advice should be sought without delay.
Drug InteractionsAminoglutethimide
Aminoglutethimide may diminish adrenal suppression by
corticosteroids.
Amphotericin B injection and potassium-depleting
agents
When corticosteroids are administered concomitantly with
potassium-depleting agents (e.g., amphotericin B, diuretics), patients should be
observed closely for development of hypokalemia. In addition, there have been
cases reported in which concomitant use of amphotericin B and hydrocortisone was
followed by cardiac enlargement and congestive heart failure.
Antibiotics
Macrolide antibiotics have been reported to cause a significant
decrease in corticosteroid clearance (see Drug Interactions: Hepatic Enzyme
Inducers, Inhibitors and Substrates).
Anticholinesterases
Concomitant use of anticholinesterase agents and corticosteroids
may produce severe weakness in patients with myasthenia gravis. If possible,
anticholinesterase agents should be withdrawn at least 24 hours before
initiating corticosteroid therapy.
Anticoagulants, Oral
Co-administration of corticosteroids and warfarin usually results
in inhibition of response to warfarin, although there have been some conflicting
reports. Therefore, coagulation indices should be monitored frequently to
maintain the desired anticoagulant effect.
Antidiabetics
Because corticosteroids may increase blood glucose
concentrations, dosage adjustments of antidiabetic agents may be required.
Antitubercular Drugs
Serum concentrations of isoniazid may be decreased.
Cholestyramine
Cholestyramine may increase the clearance of
corticosteroids.
Cyclosporine
Increased activity of both cyclosporine and corticosteroids may
occur when the two are used concurrently. Convulsions have been reported with
this concurrent use.
Dexamethasone Suppression Test (DST)
False-negative results in the dexamethasone suppression test
(DST) in patients being treated with indomethacin have been reported. Thus,
results of the DST should be interpreted with caution in these patients.
Digitalis Glycosides
Patients on digitalis glycosides may be at increased risk of
arrhythmias due to hypokalemia.
Ephedrine
Ephedrine may enhance the metabolic clearance of corticosteroids,
resulting in decreased blood levels and lessened physiologic activity, thus
requiring an increase in corticosteroid dosage.
Estrogens, including Oral Contraceptives
Estrogens may decrease the hepatic metabolism of certain
corticosteroids, thereby increasing their effect.
Hepatic Enzyme Inducers, Inhibitors and
Substrates
Drugs which induce cytochrome P450 3A4 (CYP 3A4) enzyme activity
(e.g., barbiturates, phenytoin, carbamazepine,
rifampin) may enhance the metabolism of corticosteroids and require that
the dosage of the corticosteroid be increased. Drugs which inhibit CYP 3A4
(e.g., ketoconazole, macrolide antibiotics such as
erythromycin) have the potential to result in increased plasma
concentrations of corticosteroids. Dexamethasone is a moderate inducer of CYP
3A4. Co-adminstration with other drugs that are metabolized by CYP 3A4 (e.g., indinavir, erythromycin) may increase their
clearance, resulting in decreased plasma concentration.
Ketoconazole
Ketoconazole has been reported to decrease the metabolism of
certain corticosteroids by up to 60%, leading to increased risk of
corticosteroid side effects. In addition, ketoconazole alone can inhibit adrenal
corticosteroid synthesis and may cause adrenal insufficiency during
corticosteroid withdrawal.
Nonsteroidal Anti-Inflammatory Agents (NSAIDS)
Concomitant use of aspirin (or other nonsteroidal
antiinflammatory agents) and corticosteroids increases the risk of
gastrointestinal side effects. Aspirin should be used cautiously in conjunction
with corticosteroids in hypoprothrombinemia. The clearance of salicylates may be
increased with concurrent use of corticosteroids.
Phenytoin
In post-marketing experience, there have been reports of both
increases and decreases in phenytoin levels with dexamethasone
co-administration, leading to alterations in seizure control.
Skin Tests
Corticosteroids may suppress reactions to skin tests.
Thalidomide
Co-administration with thalidomide should be employed cautiously,
as toxic epidermal necrolysis has been reported with concomitant use.
Vaccines
Patients on corticosteroid therapy may exhibit a diminished
response to toxoids and live or inactivated vaccines due to inhibition of
antibody response. Corticosteroids may also potentiate the replication of some
organisms contained in live attenuated vaccines. Routine administration of
vaccines or toxoids should be deferred until corticosteroid therapy is
discontinued if possible (see WARNINGS: Infections: Vaccination).
Carcinogenesis, Mutagenesis, Impairment of
Fertility
No adequate studies have been conducted in animals to determine
whether corticosteroids have a potential for carcinogenesis or mutagenesis.
Steroids may increase or decrease motility and number of spermatozoa in some
patients.
PregnancyTeratogenic Effects:Pregnancy Category C
Corticosteroids have been shown to be teratogenic in many species
when given in doses equivalent to the human dose. Animal studies in which
corticosteroids have been given to pregnant mice, rats, and rabbits have yielded
an increased incidence of cleft palate in the offspring. There are no adequate
and well-controlled studies in pregnant women. Corticosteroids should be used
during pregnancy only if the potential benefit justifies the potential risk to
the fetus. Infants born to mothers who have received substantial doses of
corticosteroids during pregnancy should be carefully observed for signs of
hypoadrenalism.
Nursing Mothers
Systemically administered corticosteroids appear in human milk
and could suppress growth, interfere with endogenous corticosteroid production,
or cause other untoward effects. Because of the potential for serious adverse
reactions in nursing infants from corticosteroids, a decision should be made
whether to discontinue nursing or to discontinue the drug, taking into account
the importance of the drug to the mother.
Pediatric Use
The efficacy and safety of corticosteroids in the pediatric
population are based on the well-established course of effect of
corticosteroids, which is similar in pediatric and adult populations. Published
studies provide evidence of efficacy and safety in pediatric patients for the
treatment of nephrotic syndrome (patients >2 years of age), and aggressive
lymphomas and leukemias (patients >1 month of age). Other indications for
pediatric use of corticosteroids, e.g., severe asthma and wheezing, are based on
adequate and well-controlled trials conducted in adults, on the premises that
the course of the diseases and their pathophysiology are considered to be
substantially similar in both populations.
The adverse effects of corticosteroids in pediatric patients are similar to
those in adults (see ADVERSE
REACTIONS). Like adults, pediatric patients should be carefully observed
with frequent measurements of blood pressure, weight, height, intraocular
pressure, and clinical evaluation for the presence of infection, psychosocial
disturbances, thromboembolism, peptic ulcers, cataracts, and osteoporosis.
Pediatric patients who are treated with corticosteroids by any route, including
systemically administered corticosteroids, may experience a decrease in their
growth velocity. This negative impact of corticosteroids on growth has been
observed at low systemic doses and in the absence of laboratory evidence of
hypothalamic-pituitary-adrenal (HPA) axis suppression (i.e., cosyntropin
stimulation and basal cortisol plasma levels). Growth velocity may therefore be
a more sensitive indicator of systemic corticosteroid exposure in pediatric
patients than some commonly used tests of HPA axis function. The linear growth
of pediatric patients treated with corticosteroids should be monitored, and the
potential growth effects of prolonged treatment should be weighed against
clinical benefits obtained and the availability of treatment alternatives. In
order to minimize the potential growth effects of corticosteroids, pediatric
patients should be titrated to the lowest effective
dose.
Geriatric Use
Clinical studies did not include sufficient numbers of subjects
aged 65 and over to determine whether they respond differently from 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. In
particular, the increased risk of diabetes mellitus, fluid retention and
hypertension in elderly patients treated with corticosteroids should be
considered.