Danazol is metabolized in the liver by enzymes such as CYP3A4 .   Its elimination half-life has varied across studies, but has been found to be 3 to 10 hours after a single dose and 24 to 26 hours with repeated administration.   The major metabolites of danazol are 2-hydroxymethylethisterone (also known as 2-hydroxymethyldanazol; formed by CYP3A4 and described as inactive) and ethisterone (a progestogen and androgen),     and other, minor metabolites include δ 2 -hydroxymethylethisterone, 6β-hydroxy-2-hydroxymethylethisterone, and δ 1 -6β-hydroxy-2-hydroxymethylethisterone.  At least 10 different metabolites have been identified.  Danazol is eliminated in urine and feces , with the two primary metabolites in urine being 2-hydroxymethylethisterone and ethisterone. 
Some bodybuilders and athletes use trenbolone esters for their muscle-building and otherwise performance-enhancing effects.  Such use is illegal in the United States and many other countries. The DEA classifies trenbolone and its esters as Schedule III controlled substances under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia .