Public safety delays putting Viagra on the shelf.
van der Linde
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D007172:Erectile Dysfunction / Q000188:drug therapy; D006801:Humans; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000009:adverse effects*; D010879:Piperazines / Q000009:adverse effects*; D011356:Product Labeling / Q000592:standards*; D011687:Purines; D000068677:Sildenafil Citrate; D013019:South Africa; D013450:Sulfones
D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate