Viagra--after one year.
Steers
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Department of Urology, University of Virginia Health Sciences Center, Charlottesville 22908, USA.
D007172:Erectile Dysfunction / Q000188:drug therapy*; D005544:Forecasting; D006801:Humans; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology / Q000627:therapeutic use*; D010879:Piperazines / Q000494:pharmacology / Q000627:therapeutic use*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate