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 . 
As with all anabolic steroids Oxandrolone will suppress natural testosterone production in men. Testosterone suppression does vary from steroid to steroid in terms of the rate and Oxandrolone is one of the milder forms. However, most all men will still need some form of exogenous testosterone if they are using Oxandrolone at any significant dose for any significant time. Those who do not supplement with testosterone have an excellent chance of putting themselves into a low testosterone condition. For the purpose of information a performance level dosing of Oxandrolone will suppress natural testosterone production in most men by dropping serum testosterone levels by 50%. This will put most men into a low level state and if not certainly in a below optimal state.
Once the use of Oxandrolone is done and it along with all anabolic steroids has cleared the body natural testosterone production will begin again. It’s important to note that recovering prior natural levels assumes no prior low level condition existed and that there was no damage done to the HPTA during steroid use . Most men will need a Post Cycle Therapy (PCT) plan to aid in recovery, but they should also note that PCT will not promote full recovery. It takes several months to recover from anabolic steroid use and there’s no guarantee that you always will even with the best PCT plan in the world.
Stanozolol is the generic name of stanozolol in English , German , French , and Japanese and its INN , USAN , USP , BAN , DCF , and JAN , while stanozololum is its name in Latin , stanozololo is its name in Italian and its DCIT , and estanozolol is its name in Spanish .    Androstanazole , stanazol , stanazolol , and estanazolol are unofficial synonyms of stanozolol.   The drug is also known generically by its former developmental code names NSC-43193 and WIN-14833 .