Viagra is a prescription medicine used to treat the symptoms of erectile dysfunction. VIAGRA (sildenafil citrate), an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). Viagra may be used alone or with other medications. The concept of using Viagra with anabolic steroids to assist in a workout isn’t new. The idea revolves around Viagra’s ability to dilate and open blood vessels in order to deliver the anabolic to working muscle groups more effectively, thus potentially delivering better gains.