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Name:Methitest
Manufacturer:Global Pharmaceuticals, Division Of Impax Laboratories Inc.
Category:Prescription Marketed Drugs


METHITEST™ (METHYLTESTOSTERONE) TABLETS, USP CIII

METHITEST - methyltestosterone tablet 
Global Pharmaceuticals, Division of Impax Laboratories Inc.

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METHITEST™
(METHYLTESTOSTERONE)
TABLETS, USP
CIII

DESCRIPTION

METHITEST™ Tablets contain methyltestosterone, USP, a synthetic androgen. Androgens are steroids that develop and maintain primary and secondary male sex characteristics. Methyltestosterone Tablets are to be taken orally.

Androgens are derivatives of cyclopentanoperhydrophenanthrena. Endogenous androgens are C-19 steroids with a side chain at C-17, and with two angular methyl groups. Testosterone is the primary endogenous androgen. In their active form, all drugs in the class have a 17-beta-hydroxy group. 17-alpha alkylation (methyltestosterone) increases the pharmacologic activity per unit weight compared to testosterone when given orally.

Methyltestosterone is the 17α-methyl derivative of testosterone, the true testicular hormone. Chemically, methyltestosterone is 17β-hydroxy-17-methylandrost-4-en-3-one, with the empirical formula C20H30O2 a molecular weight of 302.5, and the following structural formula:

Chemical Structure
C20H30O2 m.w. 302.46 (CAS-58-18-4)
17β-Hydroxy-17-methylandrost-4-en-3-one

Methyltestosterone is a white to creamy-white, odorless, slightly hydroscopic powder. It is practically insoluble in water, and is soluble in alcohol and other organic solvents. Methyltestosterone Tablets contain methyltestosterone, USP and Acacia, Lactose Monohydrate, NF, Confectioner's Sugar 6x, NF, Corn Starch, Sodium Starch Glycolate, Powdered Cellulose, and Magnesium Stearate.

CLINICAL PHARMACOLOGY

Endogenous androgens are responsible for the normal growth and development of the male sex organs and for maintenance of secondary sex characteristics. These effects include the growth and maturation of prostate, seminal vesicles, penis and scrotum; the development of male hair distribution, such as beard, pubic, chest, and axillary hair; laryngeal enlargement, vocal cord thickening; alterations in body musculature and fat distribution. Drugs in this class also cause retention of nitrogen, sodium, potassium, phosphorus, and decreased urinary excretion of calcium. Androgens have been reported to increase protein anabolism and decrease protein catabolism. Nitrogen balance is improved only when there is sufficient intake of calories and protein.

Androgens are responsible for the growth spurt of adolescence and for the eventual termination of linear growth which is brought about by fusion of the epiphyseal growth centers. In children, exogenous androgens accelerate linear growth rates, but may cause a disproportionate advancement in bone maturation. Use over long periods may result in fusion of the epiphyseal growth centers and termination of growth process. Androgens have been reported to stimulate the production of red blood cells by enhancing the production of erythropoietic stimulating factor.

During exogenous administration of androgens, endogenous testosterone release is inhibited through feedback inhibition of pituitary luteinizing hormone (LH). With large doses of exogenous androgens, spermatogenesis may also be suppressed through feedback inhibition of pituitary follicle stimulating hormone (FSH). There is a lack of substantial evidence that androgens are effective in fractures, surgery, convalescence, and functional uterine bleeding.

Pharmacokinetics

Testosterone given orally is metabolized by the gut and 44% is cleared by the liver in the first pass. Oral doses as high as 400 mg per day are needed to achieve clinically effective blood levels for full replacement therapy. The synthetic androgen (methyltestosterone) is less extensively metabolized by the liver and has a longer half-life. It is more suitable than testosterone for oral administration.

Testosterone in plasma is 98% bound to a specific testosterone-estradiol binding globulin, and about 1% is free. Generally, the amount of this sex-hormone binding globulin in the plasma will determine the distribution of testosterone between free and bound forms, and the free testosterone concentration will determine its half-life.

About 90% of a dose of testosterone is excreted in the urine as glucuronic and sulfuric acid conjugates of testosterone and its metabolites; about 6% of a dose is excreted in the feces, mostly in the unconjugated form. Inactivation of testosterone occurs primarily in the liver. Testosterone is metabolized to various 17-keto steroids through two different pathways. As reported in the literature, the half-life of testosterone varies considerably, ranging from 10 to 100 minutes.

In many tissues the activity of testosterone appears to depend on reduction to dihydrotestosterone, which binds to cytosol receptor proteins. The steroid-receptor complex is transported to the nucleus where it initiates transcription events and cellular changes related to androgen action.

INDICATIONS AND USAGE

  • Males—Replacement therapy in conditions associated with deficiency or absence of endogenous testosterone:
    a)
    Primary hypogonadism (congenital or acquired)—testicular failure due to cryptorchidism, bilateral torsions, orchitis, vanishing testis syndrome; or orchidectomy.
    b)
    Hypogonadotropic hypogonadism (congenital or acquired)—idiopathic gonadotropin of LHRH deficiency, or pituitary-hypothalamic injury from tumors, trauma, or radiation. If the above conditions occur prior to puberty, androgen replacement therapy will be needed during the adolescent years for development of secondary sexual characteristics. Prolonged androgen treatment will be required to maintain sexual characteristics in these and other males who develop testosterone deficiency after puberty.
    c)
    Androgens may be used to stimulate puberty in carefully selected males with clearly delayed puberty. These patients usually have a familial pattern of delayed puberty that is not secondary to a pathological disorder; puberty is expected to occur spontaneously at a relatively late date. Brief treatment with conservative doses may occasionally be justified in these patients if they do not respond to psychological support. The potential adverse effect on bone maturation should be discussed with the patient and parents prior to androgen administration. An X-ray of the hand and wrist to determine bone age should be obtained every 6 months to assess the effect of treatment on the epiphyseal centers (see WARNINGS).
  • Females—Androgens may be used secondarily in women with advancing inoperable metastatic (skeletal) mammary cancer who are 1 to 5 years postmenopausal. Primary goals of therapy in these women include ablation of the ovaries. Other methods of counteracting estrogen activity are adrenalectomy, hypophysectomy, and/or anti-estrogen therapy. This treatment has also been used in premenopausal women with breast cancer who have benefited from oophorectomy and are considered to have a hormone-responsive tumor. Judgment concerning androgen therapy should be made by an oncologist with expertise in this field.

CONTRAINDICATIONS

Methyltestosterone Tablets are contraindicated in men with carcinomas of the breast or with known or suspected carcinomas of the prostate, and in women who are or may become pregnant. When administered to pregnant women, androgens cause virilization of the external genitalia of the female fetus. This virilization includes clitoromegaly, abnormal vaginal development, and fusion of genital folds to form a scrotal-like structure. The degree of masculinization is related to the amount of drug given and age of the fetus, and is most likely to occur in the female fetus when the drugs are given in the first trimester. If the patient becomes pregnant while taking these drugs, she should be apprised of the potential hazard to the fetus.

WARNINGS

In patients with breast cancer, androgen therapy may cause hypercalcemia by stimulating osteolysis. In this case, the drug should be discontinued.

Prolonged use of high doses of androgens has been associated with the development of peliosis hepatis and hepatic neoplasms including hepatocellular carcinoma. (See PRECAUTIONS: CARCINOGENESIS, MUTAGENESIS, IMPAIRMENT OF FERTILITY.) Peliosis hepatis can be a lifethreatening or fatal complication.

Cholestatic hepatitis and jaundice occur with 17-alpha-alkylandrogens (such as methyltestosterone) at a relatively low dose. If cholestatic hepatitis with jaundice appears or if liver function tests become abnormal, the androgen should be discontinued and the etiology should be determined. Drug-induced jaundice is reversible when the medication is discontinued.

Geriatric patients treated with androgens may be at an increased risk of developing prostatic hypertrophy and prostatic carcinoma although conclusive evidence to support this concept is lacking.

Edema with or without congestive heart failure may be a serious complication in patients with pre-existing cardiac, renal or hepatic disease. In addition to discontinuation of the drug, diuretic therapy may be required.

Gynecomastia frequently develops and occasionally persists in patients being treated for hypogonadism.

Androgen therapy should be used cautiously in healthy males with delayed puberty. The effect on bone maturation should be monitored by assessing bone age of the wrist and hand every 6 months. In children, androgen treatment may accelerate bone maturation without producing compensatory gain in linear growth. This adverse effect may result in compromised adult stature. The younger the child the greater the risk of compromising final mature height.

This drug has not been shown to be safe and effective for the enhancement of athletic performance. Because of the potential risk of serious adverse health effects, this drug should not be used for such purpose.

PRECAUTIONS

General

Woman should be observed for signs of virilization (deepening of the voice, hirsutism, acne, clitoromegaly, and menstrual irregularities). Discontinuation of drug therapy at the time of evidence of mild virilism is necessary to prevent irreversible virilization. Such virilization is usual following androgen use at high doses. The patient and physician may decide that some virilization will be tolerated during treatment for breast carcinoma.

Priapism or excessive sexual stimulation may develop. Males, especially the elderly, may become overstimulated. In treating males for symptoms of climacteric, avoid stimulation to the point of increasing the nervous, mental, and physical activities beyond the patient's cardiovascular capacity.

Oligospermia and reduced ejaculatory volume may occur after prolonged administration or excessive dosage.

Information for the Patients

The physician should instruct patients to report any of the following side effects of androgens:

 
Adult or Adolescent Males: Too frequent or persistent erections of the penis.
 
Women: Hoarseness, acne, changes in menstrual periods, or more hair on the face.
 
All Patients: Any nausea, vomiting, changes in skin color, or ankle swelling.

Any male adolescent patient receiving androgens for delayed puberty should have bone development checked every 6 months.

Laboratory Tests

  1. Women with disseminated breast carcinoma should have frequent determination of urine and serum calcium levels during the course of androgen therapy (See WARNINGS).
  2. Because of the hepatotoxicity associated with the use of 17-alpha-alkylated androgens, liver function tests should be obtained periodically.
  3. Periodic (every 6 months) X-ray examinations of bone age should be made during treatment of prepubertal males to determine the rate of bone maturation and the effects of androgen therapy on the epiphyseal centers.
  4. Hemoglobin and hemotocrit should be checked periodically for polycythemia in patients who are receiving high doses of androgens.

Drug Interactions

  1. Anticoagulants: C-17 substituted derivatives of testosterone, such as methandrostenolone have been reported to decrease the anticoagulant requirements of patients receiving oral anticoagulants. Patients receiving anticoagulant therapy require close monitoring, especially when androgens are started or stopped.
  2. Oxyphenbutazone: Concurrent administration of oxyphenbutazone and androgens may result in elevated serum levels of oxyphenbutazone.
  3. Insulin: In diabetic patients, metabolic effects of androgens may decrease blood glucose and insulin requirements.

Drug/Laboratory Test Interference

Androgens may decrease levels of thyroxine-binding globulin, resulting in decreased total T4 serum levels and increased resin uptake of T3 and T4. Free thyroid hormone levels remain unchanged, however, and there is no clinical evidence of thyroid dysfunction.

Carcinogenesis, Mutagenesis, Impairment of Fertility

Animal Data

Testosterone has been tested by subcutaneous injection and implantation in mice and rats. The implant induced cervical-uterine tumors in mice, which metastasized in some cases. There is suggestive evidence that injection of testosterone into some strains of female mice increases their susceptibility to hepatoma. Testosterone is also known to increase the number of tumors and decrease the degree of differentiation of chemically induced carcinomas of the liver in rats.

Human Data

There are rare reports of hepatocellular carcinoma in patients receiving long-term therapy with androgens in high doses. Withdrawal of the drugs did not lead to regression of the tumors in all cases.

Geriatric patients treated with androgens may be at an increased risk of developing prostatic hypertrophy and prostatic carcinoma although conclusive evidence to support this concept is lacking.

This compound has not been tested for mutagenic potential. However, as noted above, carcinogenic effects have been attributed to treatment with adrogenic hormones. The potential carcinogenic effects likely occur through a hormonal mechanism rather than by a direct chemical interaction mechanism.

Impairment of fertility was not tested directly in animal species. However, as noted below under ADVERSE REACTIONS, oligospermia in males and amenorrhea in females are potential adverse effects of treatment with Methyltestosterone Tablets. Therefore, impairment of fertility is a possible outcome of treatment with Methyltestosterone Tablets.

Pregnancy

Teratogenic Effects

Pregnancy Category X

(See CONTRAINDICATIONS).

Nursing Mothers

It is not known whether androgens are excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from androgens, 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

Androgen therapy should be used very cautiously in children and only by specialists who are aware of the adverse effects on bone maturation. Skeletal maturation must be monitored every six months by an X-ray of the hand and wrist (See INDICATIONS & USAGE, and WARNINGS).

ADVERSE REACTIONS

Endocrine and Urogenital

Female

The most common side effects of androgen therapy are amenorrhea and other menstrual irregularities, inhibition of gonadotropin secretion, and virilization, including deepening of the voice and clitoral enlargement. The latter usually is not reversible after androgens are discontinued. When administered to a pregnant woman, androgens cause virilization of external genitalia of the female fetus.

Male

Gynecomastia, and excessive frequency and duration of penile erections. Oligospermia may occur at high dosage (see CLINICAL PHARMACOLOGY).

Skin and Appendages: Hirsutism, male pattern of baldness, and acne.

Fluid and Electrolyte Disturbances: Retention of sodium, chloride, water, potassium, calcium, and inorganic phosphates.

Gastrointestinal: Nausea, cholestatic jaundice, alterations in liver function tests, rarely hepatocellular neoplasma and peliosis hepatis (see WARNINGS).

Hematologic: Suppression of clotting factors II, V, VII, and X, bleeding in patients on concomitant anticoagulant therapy, and polycythemia.

Nervous System: Increased or decreased libido, headache, anxiety, depression, and generalized paresthesia.

Metabolic: Increased serum cholesterol.

Miscellaneous: Rarely, anaphylactoid reactions.

DRUG ABUSE AND DEPENDENCE

Controlled Substance Class

METHYLTESTOSTERONE Tablets are classified as controlled substances under the Anabolic Steroids Control Act of 1990 and have been assigned to Schedule III.

OVERDOSAGE

Overdose of medication may be reflected in the occurrence of the signs and symptoms associated with testosterone-anabolic drugs. Nausea and appearance of the early manifestations of edema should be looked for. However, there has been no report of acute overdosage with androgens.

DOSAGE AND ADMINISTRATION

Dosage must be strictly individualized. The suggested dosage for androgens varies depending on the age, sex, and diagnosis of the individual patient. Adjustments and duration of dosage will depend upon the patient's response and the appearance of adverse reactions.

Males

In the androgen-deficient male the guideline for replacement therapy indicates the usual initial dosage of 10-50 mg daily.

Various dosage regimens have been used to induce pubertal changes in hypogonadel males: some experts have advocated lower dosages initially, gradually increasing the dose as puberty progresses, with or without a decrease to maintenance levels. Other experts emphasize that higher dosages are needed to induce pubertal changes and lower dosages can be used for maintenance after puberty. The chronological and skeletal ages must be taken into consideration, both in determining the initial dose and in adjusting the dose.

Dosages used in delayed puberty generally are in the lower ranges of those given above, and are for limited duration, for example, 4 to 6 months.

Females

Women with metastatic breast carcinoma must be followed closely because androgen therapy occasionally appears to accelerate the disease. Thus, many experts prefer to use the shorter acting androgen preparations rather than those with prolonged activity for treating breast carcinoma particularly during the early stages of androgen therapy.

Guideline dosages of androgens for use in the palliative treatment of women with metastatic breast cancer are 50-200 mg daily.

HOW SUPPLIED

Each compressed, single-scored, round, white tablet contains 10 mg of methyltestosterone for oral use.

Bottles of 100 tablets.

Each tablet debossed 7037.

Protect from Light, Moisture and Heat

Store at controlled room temperature, 15°-30°C (59°-86°F).

This package not for household dispensing. Dispense in a tight, light-resistant container as defined in the USP, with a child-resistant closure, as required.

Rx Only

Mfg. by: IMPAX Laboratories, Inc.
Hayward, California 94544
Dist. by: Global Pharmaceutical Corporation
Division of IMPAX Laboratories, Inc.
Philadelphia, PA 19124

Rev. 4/2005
120-04

PRINCIPAL DISPLAY PANEL - 10 mg Bottle Label

GLOBAL®

NDC 0115-7037-01

CIII
METHITEST™
MethylTESTOSTERone
Tablets, USP

10 mg

Rx only

100 TABLETS

PRINCIPAL DISPLAY PANEL - 10 mg Bottle Label

METHITEST 
methyltestosterone tablet
Product Information
Product Type HUMAN PRESCRIPTION DRUG Item Code (Source) NDC:0115-7037
Route of Administration ORAL DEA Schedule CIII    
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
METHYLTESTOSTERONE (METHYLTESTOSTERONE) METHYLTESTOSTERONE 10 mg
Inactive Ingredients
Ingredient Name Strength
ACACIA  
LACTOSE MONOHYDRATE  
SUCROSE  
STARCH, CORN  
SODIUM LAURYL SULFATE  
POWDERED CELLULOSE  
MAGNESIUM STEARATE  
GUAR GUM  
Product Characteristics
Color WHITE Score 2 pieces
Shape ROUND Size 10mm
Flavor Imprint Code 7037
Contains     
Packaging
# Item Code Package Description Multilevel Packaging
1 NDC:0115-7037-01 100 TABLET ( TABLET) in 1 BOTTLE None

Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
ANDA ANDA080767 10/17/1974

Labeler - Global Pharmaceuticals, Division of Impax Laboratories Inc. (116732830)
Establishment
Name Address ID/FEI Operations
Impax Laboratories Inc 790947167 MANUFACTURE
Establishment
Name Address ID/FEI Operations
Global Pharmaceuticals, Division of Impax Laboratories Inc. 116732830 REPACK

Revised: 11/2010 Global Pharmaceuticals, Division of Impax Laboratories Inc.



Source: http://dailymed.nlm.nih.gov
Reproduced with permission of U.S. National Library of Medicine


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