Anavar (Oxandrolone) for Muscle Wasting
Oxandrolone is an FDA-approved anabolic steroid indicated for weight loss restitution after severe trauma, major surgery, infections, malnutrition due to alcoholic cirrhosis, and muscular dystrophy, with typical dosing of 5-20 mg/day orally in divided doses for adults. 1
FDA-Approved Indications
Oxandrolone is the only anabolic androgenic steroid (AAS) FDA-approved in the United States for:
- Restitution of weight loss after severe trauma 1
- Weight loss following major surgery or infections 1
- Malnutrition due to alcoholic cirrhosis 1
- Duchenne's or Becker's muscular dystrophy 1
Recommended Dosing
Standard Dosing Regimens
- HIV-associated wasting: 5-15 mg/day orally; the 15 mg/day dose showed superior weight gain and improvements in appetite and activity over 16 weeks 2
- Severe burn injury: 10 mg orally twice daily (20 mg/day total) improved wound healing, restored lean body mass, and accelerated body weight gain 3
- Older adults (sarcopenia): 20 mg/day for 12 weeks increased lean body mass by 3.0 kg, muscle strength by 5-9%, and reduced trunk fat 4
- Muscle atrophy prevention: Treatment for 2 weeks prevented muscle retraction and atrophy by reducing fibrosis and increasing muscle fiber cross-sectional area 5
Critical dosing consideration: Higher doses (15 mg/day) demonstrate more consistent weight gain and functional improvements compared to lower doses (5 mg/day) in wasting conditions 2
Mechanism and Clinical Effects
Oxandrolone's novel C17alpha-alkylated chemical configuration confers:
- Resistance to liver metabolism while maintaining marked anabolic activity 1
- Selective anabolic effects on muscle and bone 1
- Improvements in body composition, muscle strength, and nutritional status 1
Documented Benefits
- Lean body mass: Increases of 3.0 kg over 12 weeks in older adults 4
- Muscle strength: 5-9% improvements in various muscle groups (leg press, chest press, latissimus exercises) 4
- Fat reduction: Sustained decreases in total and trunk fat (-1.5 to -1.9 kg) 4
- Wound healing: Accelerated healing in severe burn patients 3
- Functional capacity: Increased appetite and activity levels 2
Contraindications and Precautions
Absolute Contraindications
- Pregnancy (virilization risk)
- Prostate cancer
- Male breast cancer
- Hypercalcemia
Relative Contraindications and Monitoring Requirements
- Hepatic function: Monitor transaminases regularly, though oxandrolone shows significantly less hepatotoxicity than other C17alpha-alkylated AASs 1
- Lipid profile: Monitor HDL cholesterol, as reductions are commonly documented 1
- Testosterone levels: In HIV wasting, testosterone deficiency should be corrected first, as testosterone substitution is Grade A evidence for restoring muscle mass 6
Important caveat: Unlike other oral anabolic steroids (e.g., oxymetholone), oxandrolone does not exhibit serious hepatotoxic effects such as jaundice, cholestatic hepatitis, peliosis hepatis, or neoplasms 1
Common Adverse Effects
Most Frequently Reported (>50% of users)
- Mood swings 7
- Decreased testicular size 7
- Acne 7
- Transient elevations in transaminase levels 1
- Reductions in HDL cholesterol 1
Serious but Less Common
- Dose-dependent liver toxicity (significantly less than oxymetholone, which showed 30% toxicity at 100 mg/day) 6
Critical safety note: More than 50% of users in surveys report significant adverse effects, though more than 90% report satisfaction with muscle mass gains 7
Duration of Effects
Major limitation: Anabolic improvements are not durable after discontinuation 4
- Lean body mass and muscle strength gains return to baseline 12 weeks after stopping treatment 4
- Fat mass reductions are largely sustained after discontinuation 4
Clinical implication: Oxandrolone requires ongoing administration to maintain muscle mass benefits, necessitating careful risk-benefit assessment for long-term use 4
Integration with Nutritional Support
Anabolic drug treatment and enteral nutrition may complement each other in wasting conditions 6. During rehabilitation, oxandrolone therapy combined with adequate nutrition and exercise optimally improves lean body mass, muscle strength, and body weight 3
Treatment hierarchy for HIV wasting: Testosterone substitution (Grade A evidence) should be prioritized in hypogonadal patients before considering other anabolic agents 6
Common Pitfalls
- Acquisition without medical supervision: More than 90% of users acquire through internet sources without physician consultation 7
- Expecting permanent gains: Discontinuation results in loss of muscle benefits within 12 weeks 4
- Ignoring testosterone status: In HIV wasting, failing to assess and correct testosterone deficiency first misses a Grade A intervention 6
- Inadequate monitoring: Transaminases and lipid profiles require regular assessment 1