What are the side effects of naposim?

Updated February 21, 2017

Naposim is a performance-enhancing drug sometimes called Dianabol or methan drostenolone. Naposim is an anabolic steroid, a type of medication that poses a risk of many harmful side effects.


Because of the side effects possible from anabolic steroids like Naposim, the U.S. Congress passed the Anabolic Steroid Act of 1990, making it illegal to purchase anabolic steroids without a prescription.

Expert Insight

In July 2009, the U.S. Food and Drug Administration issued a warning letter about the dangers of dietary supplements that contain anabolic steroids like Naposim. The letter warns users that such products pose serious health risks.

Types of Side Effects

Side effects of anabolic steroids like Naposim include severe acne, aggression and depression, reports the Mayo Clinic. Men who use anabolic steroids may develop enlarged breasts, baldness, shrunken testicles and permanent infertility, while women are at risk for a deeper voice, an enlarged clitoris, increased body hair and baldness.


More serious risks associated with anabolic steroids include liver injury, kidney failure and blood clots in your lungs, warns the U.S. Food and Drug Administration (FDA).


Athletes who take Naposim may test positive for illegal performance-enhancing drugs, reports the FDA. The use of anabolic steroids is also habit-forming in some people, warns RxList.

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About the Author

Faith Davies has been writing professionally since 1996, contributing to various websites. She holds an LAH insurance license in the state of Pennsylvania and has experience as a bank branch manager and lending officer. Davies graduated cum laude from the University of Pittsburgh with a Bachelor of Arts in art history.