The dangers of using and abusing Viagra.
Salyer
David
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D006801:Humans; D008297:Male; D010410:Penile Erection; D010879:Piperazines / Q000008:administration & dosage* / Q000009:adverse effects; D011687:Purines; D000068677:Sildenafil Citrate; D019966:Substance-Related Disorders; D013450:Sulfones; D014481:United States
D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate