Drug class: Androgens
ATC class: A14AA
VA class: HS100
Chemical name: 17β-Hydroxy-17-αmethyl-2-oxa-5α-androstan-3-one
Molecular formula: C₁₉H₃₀O₃
CAS number: 53-39-4

Medically reviewed by Drugs.com on Nov 17, 2023. Written by ASHP.

Introduction

Synthetic androgenic anabolic steroid hormone.^{1 4}

Uses for Oxandrolone

Catabolic and Wasting Disorders

Adjunct to conventional therapy to promote weight gain in individuals who experience weight loss following extensive surgery, chronic infections (e.g., HIV-associated wasting syndrome; designated an orphan drug by FDA for this use),³ or severe trauma (e.g., burns, spinal cord injury).^{1 5 17 19 22 32}

Adjunct to conventional therapy for management of unexplained weight loss.¹

Corticosteroid-induced Protein Catabolism

Adjunct to conventional therapy to offset protein catabolism (e.g., muscle wasting, muscle pain or weakness, delayed wound healing, atrophy of protein matrix of bone) associated with long-term corticosteroid therapy.^{1 4 20 21 33}

Osteoporosis

Labeled for the symptomatic treatment of bone pain accompanying osteoporosis.^{1 4 23}

Misuse, Abuse, and Dependence

Androgens have been misused and abused by athletes, bodybuilders, weight lifters, and others to enhance athletic performance or physique^{† [off-label]}.^{6 7 8 9 10 32 193 194}

Based on review of data, FDA concluded that misuse and abuse of androgens associated with serious adverse cardiovascular, hepatic, endocrine, and mental health effects.^{193 194} (See Misuse, Abuse, and Dependence under Cautions.)

Medical and sports experts (e.g., International Olympic Committee) consider such use to be inappropriate and unacceptable because of known adverse effects and potential long-term sequelae.⁹ Such misuse by athletes is contrary to rules and ethical principles of athletic competition.^{7 8 9 10}

Manufacturer states that androgens have not been shown to enhance athletic performance.¹

Evaluate serum testosterone concentrations if misuse or abuse of androgens suspected (e.g., patients experiencing serious adverse cardiovascular or psychiatric effects).¹⁹⁴ Serum testosterone concentrations may be below or within the normal range in patients abusing synthetic derivatives of testosterone.¹³⁵

Oxandrolone Dosage and Administration

General

• Individualize dosage and duration of therapy carefully according to individual requirements, response, and tolerance.^{1 4} Use the minimum effective dosage; intended for intermittent use.^{1 4 22}

Administration

Oral Administration

Administer orally 2–4 times daily in adults.^{1 4}

Dosage

Pediatric Patients

Catabolic and Wasting Disorders

Oral

≤0.1 mg/kg daily for 2–4 weeks.^{1 4} Repeat course of therapy intermittently as needed to maintain weight.^{1 4 32}

Manufacturer states that a 2- to 4-week course of therapy usually is adequate to observe a response (i.e., slowing or cessation of weight loss).^{1 4 32} A longer period of treatment is necessary to regain lost weight, especially if ongoing catabolic stressors are present.³²

Higher than recommended dosage of 0.1 mg/kg twice daily for 5 days to 12 months^{† [off-label]} has been evaluated in pediatric patients with burns.^{1 4 5 16 17 18 32}

Corticosteroid-induced Protein Catabolism

Oral

≤0.1 mg/kg daily.^{1 4} Manufacturer states that a 2- to 4-week course of therapy usually is adequate to observe a response.^{1 4 32} Repeat course of therapy intermittently as needed.^{1 4 32}

Adults

Catabolic and Wasting Disorders

Oral

2.5–20 mg daily in 2–4 divided doses for 2–4 weeks.^{1 4} Repeat course of therapy intermittently as needed to maintain weight.^{1 4 32}

Manufacturer states that a 2- to 4-week course of therapy usually is adequate to observe a response (i.e., slowing or cessation of weight loss).^{1 4 32} A longer period of treatment is necessary to regain lost weight, especially if ongoing catabolic stressors are present.³² Continuous administration for 3–4 months has been evaluated in patients with HIV-associated wasting syndrome.^{5 19}

Corticosteroid-induced Protein Catabolism

Oral

2.5–20 mg daily in 2–4 divided doses.^{1 4} Manufacturer states that a 2- to 4-week course of therapy usually is adequate to observe a response.^{1 4 32} Repeat course of therapy intermittently as needed.^{1 4 32}

Osteoporosis

Bone Pain

Oral

2.5–20 mg daily in 2–4 divided doses.^{1 4} Manufacturer states that a 2- to 4-week course of therapy usually is adequate to observe a response.^{1 4} Repeat course of therapy intermittently as needed.^{1 4}

Special Populations

Geriatric Patients

5 mg twice daily for 2–4 weeks recommended.¹ Repeat course of therapy intermittently as needed.¹ (See Geriatric Use under Cautions.)

Cautions for Oxandrolone

Contraindications

• Males with breast cancer or known or suspected prostate cancer.^{1 4}

• Women with hypercalcemia associated with metastatic breast cancer.^{1 4} (See Hypercalcemia under Cautions.)

• Known or suspected pregnancy.^{1 4} (See Fetal/Neonatal Morbidity and Mortality under Cautions.)

• Nephrosis.^{1 4}

• Hypercalcemia.^{1 4} (See Hypercalcemia under Cautions.)

Warnings/Precautions

Warnings

Fetal/Neonatal Morbidity and Mortality

May cause fetal harm; potential for virilization of fetus.^{1 4}

Fetotoxicity, embryotoxicity, infertility, and virilization of female offspring demonstrated in animals.^{1 4}

Hepatic Effects

Potentially serious and/or life-threatening adverse hepatic effects (e.g., peliosis hepatis, hepatic adenomas, hepatocellular carcinoma) associated with prolonged use of high dosages of androgens.^{5 6 7 9 10 22} (See Boxed Warning.)

If cholestatic hepatitis with jaundice occurs, or if liver function test results become abnormal during therapy, discontinue oxandrolone and investigate etiology of these disorders.^{1 4} Drug-induced jaundice usually is reversible after discontinuance of drug.^{1 4}

Monitor liver function periodically.^{1 4 17 22}

Hypercalcemia

Possible hypercalcemia resulting from osteolysis in women with metastatic carcinoma of the breast.^{1 4} Monitor urine and serum calcium concentrations frequently during the course of androgen therapy in women with metastatic breast cancer.^{1 4 30}

If hypercalcemia occurs, discontinue the drug.^{1 4} (See Contraindications under Cautions.)

Fluid Retention

Edema, with or without CHF, possible as a result of sodium and water retention and may be a serious complication in patients with preexisting cardiac, renal, or hepatic disease.^{1 4 30} (See Geriatric Use under Cautions.)

Misuse, Abuse, and Dependence

Serious adverse effects (e.g., increased aggression,^{6 7 8 10 13 22} antisocial behavior,^{6 7} manic episode,^{6 22} hostility,¹⁹⁴ depression,⁹ changes in libido,^{6 7 8 9 10 22} increased risk of cardiovascular events,^{6 7 8 9} hepatotoxicity,^{6 7 8 9 10} testicular atrophy, sperm abnormalities^{135 193 194} ) associated with misuse and abuse of androgens (see Misuse, Abuse, and Dependence under Uses); oxandrolone preparations currently subject to control as schedule III (C-III) drugs.^{11 32}

Manifestations of withdrawal (e.g., depressed mood, major depression, fatigue, cravings, restlessness, irritability, anorexia, insomnia, decreased libido, hypogonadotropic hypogonadism) may occur if androgens discontinued abruptly or dosage substantially reduced in physically dependent patients or in those taking supratherapeutic dosages of the drug; withdrawal symptoms may persist for weeks or months.¹³⁵

General Precautions

Virilization

Virilization, including baldness, clitoral enlargement, deepening of voice, hirsutism, and menstrual irregularities, may occur in females.^{1 4 5 6 9 13}

Monitor women receiving oxandrolone therapy for signs of virilization.^{1 4} If virilization occurs, promptly discontinue therapy.^{1 4} Some changes may not be reversible (e.g., clitoral enlargement, voice changes) after discontinuance of the drug; concomitant use of estrogen with androgens does not prevent these effects.^{1 4 6 7 32}

Hematologic Effects

Possible polycythemia, especially with high dosages of androgens.^{1 4 30} Perform periodic hemoglobin and hematocrit determinations in patients receiving high dosages of androgens.^{1 4 30}

Anabolic steroids may suppress clotting factors II, V, VII, and X and prolong PT.^{1 4} (See Specific Drugs and Laboratory Tests under Interactions.)

Lipid Abnormalities

Androgens may increase LDL-cholesterol and decrease HDL-cholesterol concentrations; consider the increased risk for cardiovascular disease.^{1 4 5 6 7 10 12 13 19 22 32} Lipid concentrations return to baseline values approximately 1 month after discontinuance of androgen therapy.²²

Use with caution in patients with cardiovascular disease or risk factors for cardiovascular disease.^{1 4} Determine serum lipid concentrations periodically; adjust therapy accordingly.^{1 4}

Specific Populations

Pregnancy

Category X.^{1 4} (See Fetal/Neonatal Morbidity and Mortality and also Contraindications under Cautions.)

Lactation

Not known whether oxandrolone is distributed into milk.^{1 4} Discontinue nursing or the drug.^{1 4}

Pediatric Use

May accelerate bone maturation without producing compensatory gain in linear growth, possibly resulting in compromised adult stature.^{1 4 10} The younger the child, the greater the risk of the drug compromising final mature stature.^{1 4}

Use with extreme caution in children and only under the supervision of a specialist who is aware of the adverse effects of oxandrolone on bone maturation.^{1 4} Perform radiographic examination of the left hand and wrist every 6 months to determine rate of bone maturation and to assess the effect of treatment on epiphyseal centers.^{1 4}

Geriatric Use

Possible increased risk of developing prostatic hypertrophy and prostate cancer during androgen therapy.^{1 4 30}

Response in patients ≥65 years of age does not appear to differ from that in younger adults.¹ Increased sensitivity to fluid retention and increases in hepatic transaminase values reported, particularly in geriatric women.¹ Use lower dosage to minimize adverse effects.¹ (See Geriatric Patients under Dosage and Administration.)

Common Adverse Effects

Elevated aminotransferases (ALT, AST),^{1 4 5 13 17 19} lipid abnormalities (e.g., decreased HDL cholesterol concentrations).^{1 4 5 13 19}

Drug Interactions

Specific Drugs and Laboratory Tests

Oxandrolone Pharmacokinetics

Absorption

Bioavailability

Well absorbed after oral administration, with peak serum concentrations attained in approximately 1 hour.^{5 13}

Distribution

Plasma Protein Binding

95%.^{5 13}

Elimination

Metabolism

Partially metabolized via sulfation to 17-epioxandrolone; other metabolites also identified.^{5 13 14 25 27 28}

Elimination Route

Excreted principally in urine as unchanged and unconjugated oxandrolone (28%).^{5 25 27}

Half-life

Biphasic; distribution half-life is 30 minutes and elimination half-life is approximately 10.4 hours in adults.^{1 5 25}

Special Populations

In geriatric individuals, elimination half-life is 13.3 hours.¹

Stability

Storage

Oral

Tablets

20–25°C.⁴

Actions

• Produces marked anabolic activity and relatively few androgenic effects.^{5 6 7 13 14 22}

• Produces retention of nitrogen,^{5 7 13 17 22} increases protein anabolism and amino acid utilization, and decreases urinary calcium concentrations.^{2 5 13 16 18 23}

• Increases lean body mass, body cell mass, and muscle strength.^{7 9 16 17 18 19 20 22}

• Increases bone mineral density and content.^{5 13 16 22}

• Inhibits protein catabolism induced by corticosteroids.^{5 6 8 17 22}

• Androgens stimulate production of erythrocytes, apparently by enhancing production of erythropoietin.²² (See Hematologic Effects under Cautions.)

• Inhibits release of endogenous testosterone via feedback inhibition of pituitary luteinizing hormone (LH).^{1 4 7 8 10 19 22 32}

• Large doses of androgens may suppress spermatogenesis.^{1 4 6 7 8 9 22}

• Importance of advising patients of the potential for serious adverse effects associated with misuse and abuse of androgens.¹³⁵

• Risk of virilization in females.^{1 2 4 6} Advise female patients to contact their clinician if they notice hoarseness, acne, menstrual changes, baldness, genital changes, or growth of facial hair.^{1 2 4}

• Risk of priapism; importance of males informing clinicians if too frequent or persistent penile erections occur.^{1 4}

• Advise male patients to contact their clinician if they notice new or worsening acne.^{1 4}

• Importance of periodic assessments to determine rate of bone maturation in pediatric patients.^{1 4}

• Importance of informing clinician if nausea, vomiting, changes in skin color, or ankle swelling occurs.^{1 4}

• Risk of potential liver toxicity and/or lipid abnormalities (e.g., increased LDL-cholesterol concentrations and decreased HDL-cholesterol concentrations).^{1 4} Importance of regular laboratory monitoring of liver function and cholesterol concentrations.^{1 4}

• Importance of women informing their clinician if they are or plan to become pregnant or plan to breast-feed.^{1 4}

• Importance of informing clinician of existing or contemplated concomitant therapy, including prescription (e.g., warfarin, antidiabetic medications) and OTC drugs and herbal supplements, as well as any concomitant illnesses.^{1 4}

• Importance of informing patients of other important precautionary information.^{1 4} (See Cautions.)

Preparations

Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.

Please refer to the ASHP Drug Shortages Resource Center for information on shortages of one or more of these preparations.

Oxandrolone is subject to control under the Federal Controlled Substances Act of 1970, as amended by the Anabolic Steroids Control Act of 1990 and 2004, as a schedule III (C-III) drug.¹¹

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