Some people would ask about Dianabol's possible side effects. It falls under 17-AA steroid, an indication that it can cause considerable strain on the liver when taken in high doses over extended period of time. Increase in liver damage can also be noticed even in dose of 10 mg a day; however it tends to return to normal when dianabol intake is stopped. Gynecomastia is always a possible side effect for athletes who use dianabol because the drug readily converts into estrogens. High blood pressure and heart rate abnormality can also occur since dianabol quickly increases body growth and promotes excess fluid retention.