Stanozolol (also known by its brand name Winstrol) is a hard-core steroid, which stays in the system for more than a month if taken orally and up to three months if injected (the injectable form of the drug has been used by veterinarians, but it is no longer commercially available in the . and so is not used routinely now in this country, according to the American Veterinary Medical Association). It first came on the market in 1962 and consists of a four-ring drug structure, which means it is easily spotted in a drug test. Masking agents do not hide its presence.
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 .