In the short term, the side effects can include headaches, sleeplessness, and elevated blood pressure . If you currently are under doctor’s care for high blood pressure, you should not use this drug. It can significantly increase your risk of stroke, heart disease, and heart attack. For those that do not suffer from high blood pressure, some believe the benefits when used for a short period of time such as 4 – 6 weeks, are worth it. Body builders see a significant amount of increased muscle mass in the first 3 weeks of usage. The negative side effects will remain until the user stops taking the drug.