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 .  The infamous "duchess" cocktail allegedly administered to Russian athletes at the Sochi Winter Olympics consisted of oxandrolone , a metenolone ester, and a trenbolone ester. 
PCT : 25-50mg of arimidex/day OR 25-50 mg of proviron/day during the cycle. Normally 25 mg is just fine but in case of "heavy" cycles dosages up to 100 mg of proviron might be required. Actually, it’s better to use proviron instead of arimidex along with the testosterone injections since it increases volume of free testosterone in the blood thus promoting gains. Athlete should also consider the following thing – estrogen converted from androgen plays very important role in muscle gains. Thus, more anti-estrogen you use – there are less estrogen-related side effects but also less gains. So, you have to find experimentally what suits the best to your body. People who worry more about gains should use minimal dosage of anti-estrogen, people who worry more about estrogen level should use higher one.