Well, not if they're metabolized in the kidney!
Unlike other 17alpha-alkylated AASs, oxandrolone confers a resistance to liver metabolism. Oxandrolone also lacks the serious hepatotoxic effects (jaundice, cholestatic hepatitis, peliosis hepatis, hyperplasias and neoplasms) attributed to the 17alpha-alkylated AASs. Oxandrolone is reported to be generally well tolerated and the most commonly documented adverse effects are transient elevations in transaminase levels and reductions in high density lipoprotein cholesterol levels.
Instead, Oxandrolone is metabolized in the kidney, but displays no significant signs of toxicity.
Comparing Oxandrin and Anadrol-50.
Vazquez E.
Oxandrolone for delayed puberty in boys taking long-term steroid therapy for renal disease.
Rees L, Greene SA, Rigden SP, Haycock GB, Chantler C, Preece MA.