In terms of negative side effects, the only real concern would be from the androgenic properties of dihydrotestosterone. Things such as oily skin, acne, body/facial hair growth, and hair loss if prone to male pattern baldness. Drostanolone is a synthetic form of DHT, therefore Proscar would have no impact on the level of androgenic effects (1,3). Individuals with a receding hairline and/or those that are predisposed to male pattern baldness may find it necessary to avoid this compound as it is likely that it will simply aggravate the condition further. As should be expected as well, users often anecdotally reported that the compound can exasperate any existing medical conditions concerning the prostate, or cause prostate complications in those that have suffered none before (3).