Protease inhibitors and sildenafil (Viagra) should not be combined.
Highleyman
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D004347:Drug Interactions; D007172:Erectile Dysfunction / Q000188:drug therapy*; D015658:HIV Infections / Q000188:drug therapy*; D017320:HIV Protease Inhibitors / Q000009:adverse effects*; D006801:Humans; D010726:Phosphodiesterase Inhibitors / Q000009:adverse effects*; D010879:Piperazines / Q000009:adverse effects*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
D017320:HIV Protease Inhibitors; D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate