Dexone Dexamethasone

DESCRIPTION

Glucocorticoids are adrenocortical steroids, both naturally occurring and synthetic, which are readily absorbed from the gastrointestinal tract. Dexamethasone, a synthetic adrenocortical steroid, is a white to practically white, odorless, crystalline powder. It is stable in air. It is practically insoluble in water. The molecular weight is 392.47.

Dexamethasone has the chemical name 9-fluoro-11b, 17, 21-trihydroxyl-16 methyl-pregn-1,4-diene-3a, 20-dione; empirical formula C22H29FO5

DEXONE (Dexamethasone) tablets are supplied in four potencies, 0.5 mg, 0.75 mg, 1.5 mg and 4 mg.

Inactive Ingredients: Cellulose, lactose, magnesium stearate, polyethylene glycol, povidone and sodium starch glycolate. In addition, the 0.5 mg tablet contains D&C Yellow No. 10 Lake, the 0.75 mg tablet contains FD&C Blue No. 1 Lake and D&C Yellow No. 10 Lake and the 1.5 mg tablet contains FD&C Red No. 40 Aluminum Lake.

INDICATIONS

Endocrine Disorders: Primary or secondary adrenocortical insufficiency (hydrocortisone or cortisone is the first choice; synthetic analogs may be used in conjunction with mineralocorticoids where applicable; in infancy mineralocorticoid supplementation is of particular importance). Congenital adrenal hyperplasia. Nonsuppurative thyroiditis. Hypercalcemia associated with cancer.

Rheumatic Disorders: As adjunctive therapy for short-term administration (to tide the patient over an acute episode or exacerbation) in: Psoriatic arthritis. Rheumatoid arthritis, including juvenile rheumatoid arthritis (selected cases may require low-dose maintenance therapy). Ankylosing spondylitis. Acute and subacute bursitis. Acute nonspecific tenosynovitis. Acute gouty arthritis. Post-traumatic osteoarthritis, Synovitis of osteoarthritis. Epicondylitis.

Collagen Diseases: During an exacerbation or as maintenance therapy in selected cases of Systematic lupus erythematosus. Acute rheumatic carditis.

Dermatologic Diseases: Pemphigus. Bullous dermatitis herpetiformis. Severe erythema multiforme (Stevens- Johnson syndrome). Exfoliative dermatitis. Mycosis fungoides. Severe psoriasis. Severe seborrheic dermatitis.

Allergic States: Control of severe or incapacitating allergic conditions intractable to adequate trials of conventional treatment: Seasonal or perennial allergic rhinitis. Bronchial asthma. Contact dermatitis. Atopic dermatitis. Serum sickness. Drug hypersensitivity reactions.

Ophthalmic Diseases: Severe acute and chronic allergic and inflammatory processes involving the eye and its adnexa, such as: Allergic conjunctivitis. Keratitis. Allergic corneal marginal ulcers. Herpes zoster ophthalmicus. ntis and iridocyclitis. Chorioretinitis. Anterior segment inflammation. Diffuse posterior uveitis and choroiditis. Optic neuritis and Sympathetic ophthalmia.

Respiratory Diseases: Symptomatic sarcoidosis. Loefflers syndrome not manageable by other means. Berylliosis. Fulminating or disseminated pulmonary tuberculosis when used concurrently with appropriate antituberculous chemotherapy. Aspiration pneumonitis.

Hematologic Disorders: Idiopathic thrombocytopenic purpura in adults. Secondary thrombocytopenia in adults. Acquired (autoimmune) hemolytic anemia. Erythroblastopenia (ABC anemia). Congenital (erythroid) hypoplastic anemia.

Neoplastic Diseases: For palliative management of: Leukemias and lymphomas in adults. Acute leukemia of childhood.

Edematous States: To induce a diuresis or remission of proteinuria in the nephrotic syndrome, without uremia, of the idiopathic type or that due to lupus erythematosus.

Gastrointestinal Diseases: To tide the patient over a critical period of the disease in: Ulcerative colitis. Regional enteritis.

Nervous System: Acute exacerbations of multiple sclerosis.

Miscellaneous: Tuberculous meningitis with subarachnoid block or impending block when used concurrently with appropriate antituberculous chemotherapy. Trichinosis with neurologic or myocardial involvement.

Diagnostic testing of adrenocortical hyperfunction.

DOSAGE AND ADMINISTRATION

For oral administration.

DOSAGE REQUIREMENTS ARE VARIABLE AND MUST BE INDIVIDUALIZED ON THE BASIS OF THE DISEASE AND THE RESPONSE OF THE PATIENT.

The initial dosage varies from 0.75 to 9 mg a day depending on the disease being treated. In less severe diseases doses lower than 0.75 mg may suffice, while in severe diseases doses higher than 9 mg may be required. The initial dosage should be maintained or adjusted until the patients response is satisfactory. If satisfactory clinical response does not occur after a reasonable period of time, discontinue DEXONE tablets and transfer the patient to other therapy.

After a favorable initial response, the proper maintenance dosage should be determined by decreasing the initial dosage in small amounts to the lowest dosage that maintains an adequate clinical response.

Patients should be observed closely for signs that might require dosage adjustment, including changes in clinical status resulting from remissions or exacerbations of the disease, individual drug responsiveness, and the effect of stress (e.g., surgery, infection, trauma). During stress it may be necessary to increase dosage temporarily.

If the drug is to be stopped after more than a few days of treatment, it usually should be withdrawn gradually.

The following milligram equivalents facilitate changing to DEXONE from other glucocorticoids:

DEXONE 0.75 mg is equivalent to:

    Methylprednisolone & Triamcinolone 4 mg
    Prednisolone & Prednisone 5 mg
    Hydrocortisone 20 mg
    Cortisone 25 mg

Dexamethasone Suppression Tests

1. Tests for Cushings syndrome:

Give 1 mg of dexamethasone orally at 11: 00 p.m. Blood is drawn for plasma cortisol determination at 8:00 a.m. the following morning.

For greater accuracy, give 0.5 mg of dexamethasone orally every six hours for 48 hours. Twenty-four hour urine collections are made for determination of 17-hydroxycorticosteroid excretion.

2. Tests to distinguish Cushings syndrome due to pituitary ACTH excess from Cushings syndrome due to other causes:

Give 2 mg of dexamethasone orally every 6 hours for 48 hours. Twenty-four hour urine collections are made for determination of 17-hydroxycorticosteroid excretion.

Several regimens have been shown to be effective in the treatment of acute exacerbations of multiple sclerosis:

a) 200 mg prednisolone daily for one week followed by 80 mg every other day for one month; or,

b) 4 to 8 mg dexamethasone every other day for one month.

HOW SUPPLIED

Dexamethasone tablets are 1/ 4 round, scored, colored, to distinguish potency and debossed (coded) as follows:

    0.5 mg, yellow in color and coded Solvay 3205, NDC 0032-3205-01, bottles of 100s.
    0.75 mg, light green in color and coded SOLVAY 3210, NDC 0032-3210-01, bottles of 100s.
    1.5 mg, pink in color and coded SOLVAY 3215, NDC 0032-3215-01, bottles of 100s.
    4 mg, white in color and coded SOLVAY 3220, NDC 0032-3220-01, bottles of 100s.

Caution: Federal wlaw prohibits dispensing without prescription. Store at controlled room temperature, 15°-30° C (59° 86° F).

PATIENT INFORMATION

Persons who are on immunosuppressant doses of corticosteroids should be warned to avoid exposure to chicken pox or measles. Patients should also be advised that if they are exposed, medical advice should be sought without delay.

CLINICAL PHARMACOLOGY

Naturally occurring glucocorticoids (hydrocortisone and cortisone), which also have salt-retaining properties, are used in replacement therapy in adrenocortical deficiency states. Their synthetic analogs are primarily used for their potent anti-inflammatory effects in disorders of many organ systems.

Glucocorticoids cause profound and varied metabolic effects. In addition, they modify the bodys immune responses to diverse stimuli.

At equipotent anti-inflammatory doses, dexamethasone almost completely lacks the sodium retaining property of hydrocortisone and closely related derivatives of hydrocortisone.

SIDE EFFECTS

Fluid and Electrolyte Disturbances: Sodium retention; Fluid retention; Congestive heart failure in susceptible patients: Potassium loss; Hypokalemic alkalosis & Hypertension.

Musculoskeletal: Muscle weakness; Steroid myopathy; Loss of muscle mass; Osteoporosis; Vertebral compression fractures; Aseptic necrosis of femoral and humeral heads; Pathologic fracture of long bones & Tendon rupture.

Gastrointestinal: Peptic ulcer with possible perforation and hemorrhage. Perforation of the small and large bowel; particularly in patients with inflammatory bowel disease; Pancreatitis; Abdominal distention & Ulcerative esophagitis.

Dermatologic: Impaired wound healing; Thin fragile skin; Petechiae and ecchymoses; Erythema, increased sweating, may suppress reactions to skin tests. Other cutaneous reactions; such as allergic dermatitis, urticaria; angioneurotic edema.

Neurologic: Convulsions; Increased intracranial pressure with papilledema (pseudotumor cerebri) usually after treatment, Vertigo & Headache.

Endocrine: Menstrual irregularities; Development of Cushingoid state; Suppression of growth in children; Secondary adrenocortical and pituitary unresponsiveness; particularly in times of stress; as in trauma; surgery; or illness; Decreased carbohydrate tolerance; Manifestations of latent diabetes mellitus; Increased requirements for insulin or oral hypoglycemic agents in diabetes & Hirsutism.

Ophthalmic: Posterior subcapsular cataracts; increased intraocular pressure; Glaucoma & Exophthalmos.

Metabolic: Negative nitrogen balance due to protein catabolism.

Other: Hypersensitivity; Thromboembolism; Weight gain; Increased appetite; Nausea; Malaise.

WARNINGS

In patients on corticosteroid therapy subjected to unusual stress, increased dosage of rapidly acting corticosteroids before, during, and after the stressful situation is indicated.

Drug-induced secondary adrenocortical insufficiency may result from too rapid withdrawal of corticosteroids and 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. If the patient is receiving steroids already, dosage may have to be increased. Since mineralocorticoid secretion may be impaired, salt and/ or a mineralocorticoid should be administered concurrently.

Corticosteroids may mask some signs of infection, and new infections may appear during their use.

There may be decreased resistance and inability to localize infection when corticosteroids are used. Moreover, corticosteroids may affect the nitroblue-tetrazolium test for bacterial infection and produce false negative results.

In cerebral malaria, a doubleblind trial has shown that the use of corticosteroids is associated with prolongation of coma and a higher incidence of pneumonia and gastrointestinal bleeding. Corticosteroids may activate latent amebiasis. Therefore, it is recommended that latent or active amebiasis be ruled out before initiating corticosteroid therapy in any patient who has spent time in the tropics or any patient with unexplained diarrhea.

Prolonged use of corticosteroids may produce subcapsular cataracts, glaucoma with possible damage to the optic nerves, and may enhance the establishment of secondary ocular infections due to fungi or viruses.

Usage in Pregnancy

Since adequate human reproduction studies have not been done with corticosteroids, use of these drugs in pregnancy or in women of childbearing potential requires that the anticipated benefits be weighed against the possible hazards to the mother and embryo or fetus. Infants born to mothers who have received substantial doses of corticosteroids during pregnancy should be carefully observed for signs of hypoadrenalism.

Corticosteroids appear in breast milk and could suppress growth, interfere with endogenous corticosteroid production, or cause other unwanted effects. Mothers taking pharmacologic doses of corticosteroids should be advised not to nurse.

Average and large doses of hydrocortisone or cortisone can cause elevation of blood pressure, salt and water retention, and increased excretion of potassium. These effects are less likely to occur with the synthetic derivatives except when used in large doses. Dietary salt restriction and potassium supplementation may be necessary. All corticosteroids increase calcium excretion.

Administration of live virus vaccines, including smallpox, is contraindicated in individuals receiving immunosuppressive doses of corticosteroids. If inactivated viral or bacterial vaccines are administered to individuals receiving immunosuppressive doses of corticosteroid the expected serum antibody response may not be obtained. However, immunization procedures may be undertaken in patients who are receiving corticosteroids as replacement therapy, e.g., for Addisons disease.

Persons who are on drugs which suppress the immune system are more susceptible to infections than healthy individuals. Chicken pox and measles, for example, can have a more serious or even fatal course in non- immune children or adults on corticosteroids. In such children or adults who have not had these diseases, particular care should be taken to avoid exposure. How the dose, route and duration of corticosteroid administration affects the risk of developing a disseminated infection is not known. The contribution of the underlying disease and/or prior corticosteroid treatment to the risk is also not known. If exposed to chicken pox, prophylaxis with varicella zoster immune globulin (VGIG) may be indicated. If exposed to measles, prophylaxis with pooled intramuscular immunoglobulin (IG) may be indicated. (See the respective package inserts for complete VGIG and IG prescribing information). If chicken pox develops, treatment with antiviral agents may be considered.

The use of DEXONE TM tablets in active tuberculosis should be restricted to those cases of fulminating or disseminated tuberculosis in which the corticosteroid is used for the management of the disease in conjunction with an appropriate antituberculous regimen.

If corticosteroids are indicated in patients with latent tuberculosis or tuberculin reactivity, close observation is necessary as reactivation of the disease may occur. During prolonged corticosteroid therapy, these patients should receive chemoprophylaxis.

PRECAUTIONS

Following prolonged therapy, withdrawal of corticosteroids may result in symptoms of the corticosteroid withdrawal syndrome including fever, myalgia, arthralgia, and malaise. This may occur in patients even without evidence of adrenal insufficiency.

There is an enhanced effect of corticosteroids in patients with hypothyroidism and in those with cirrhosis.

Corticosteroids should be used cautiously in patients with ocular herpes simplex because of possible corneal perforation. The lowest possible dose of corticosteroids should be used to control the condition under treatment, and when reduction in dosage is possible, the reduction should be gradual.

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.

Aspirin should be used cautiously in conjunction with corticosteroids in hypoprothrombinemia.

Steroids should be used with caution in nonspecific ulcerative colitis, if there is a probability of impending perforation, abscess, or other pyogenic infection, diverticulitis, fresh intestinal anastomoses, active or latent peptic ulcer, renal insufficiency, hypertension, osteoporosis, and myasthenia gravis. Signs of peritoneal irritation following gastrointestinal perforation in patients receiving large doses of corticosteroids may be minimal or absent. Fat embolism has been reported as a possible complication of hypercortisonism.

When large doses are given, some authorities advise that corticosteroids be taken between meals to help prevent peptic ulcer.

Growth and development of infants and children on prolonged corticosteroid therapy should be carefully observed.

Steroids may increase or decrease motility and number of spermatozoa in some patients.

Phenytoin, phenobarbital, ephedrine, and rifampin may enhance the metabolic clearance of corticosteroids, resulting in decreased blood levels and lessened physiologic activity, thus requiring adjustment in corticosteroid dosage. These interactions may interfere with dexamethasone suppression tests which should be interpreted with caution during administration of these drugs.

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.

The prothrombin time should be checked frequently in patients who are receiving corticosteroids and coumarin anticoagulants at the same time because of reports that corticosteroids have altered the response to these anticoagulants. Studies have shown that the usual effect produced by adding corticosteroids is inhibition of response to coumarins, although there have been some conflicting reports of potentiation not substantiated by studies.

When corticosteroids are administered concomitantly with potassium- depleting diuretics, patients should be observed closely for development of hypokalemia. Although controlled- clinical trials have shown corticosteroids to be effective in speeding the resolution of acute exacerbations of multiple sclerosis they do not wshow that they affect the ultimate outcome or natural history of the disease. The studies do wshow that relatively high doses of corticosteroids are necessary to demonstrate a significant effect. (See DOSAGE AND ADMINISTRATION Section).

Since complications of treatment with glucocorticoids are dependent on the size of the dose and 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.

Information for Patients

Persons who are on immunosuppressant doses of corticosteroids should be warned to avoid exposure to chicken pox or measles. Patients should also be advised that if they are exposed, medical advice should be sought without delay.

OVERDOSE

No information provided.

CONTRAINDICATIONS

Systemic fungal infections. Hypersensitivity to this drug.