A 48-year-old man comes to the clinic with symptoms of ...
Normal dosage levels (20 mg/d) are unlikely to induce retinopathy. High dosages (90-120 mg bid) can cause toxic effects in 17-27 months (total cumulative dose >90 g) Causes crystalline retinopathy. Agents for Erectile Dysfunction. Sildenafil Citrate (Viagra), Vardenafil (Levitra), & Tadalafil (Cialis) ................
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