Halotestin 100 tabs contains Fluoxymesterone 5 mg/tab, which is a synthetic form of the hormone testosterone. It is commonly used in bodybuilding as a performance enhancer and for increasing muscle mass, strength, and overall physical performance. Halotestin works by breaking down fat cells and increasing protein synthesis. It also helps increase levels of aggression and affects testosterone levels within the body. Possible side effects of taking Halotestin can include increased cholesterol levels, hair loss, gynecomastia, increased blood pressure, and liver damage.