title: On call. I am 66 years old and have had angina for nearly 5 years. I take aspirin and Zocor, but I haven't needed nitroglycerin for at least 3 years, even though I ride my bike quite hard at least 4 days a week. I've started having trouble with my erections, and now I want to try Viagra. My doctor gave me a prescription, but my wife won't let me fill it. Is Viagra safe for me?
authors.forename: Harvey B
authors.initials: HB
authors.lastname: Simon
mesh_terms: D000368:Aged; D001794:Blood Pressure / Q000502:physiology; D003075:Coitus / Q000502:physiology; D000075202:Contraindications; D006801:Humans; D007093:Imidazoles; D008297:Male; D009566:Nitrates / Q000008:administration & dosage; D010879:Piperazines / Q000008:administration & dosage*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014227:Triazines; D000069058:Vardenafil Dihydrochloride; D014665:Vasodilator Agents / Q000008:administration & dosage*
chemical_list: D007093:Imidazoles; D009566:Nitrates; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014227:Triazines; D014665:Vasodilator Agents; D000069058:Vardenafil Dihydrochloride; D000068677:Sildenafil Citrate