...meds he's taking.
Research shows that Viagra’s active ingredient sildenafil does have a negative affect on patients who use nitrate drugs for pre-existing angina conditions. Viagra by interacting with nitrates can lower a person’s blood pressure to unsafe or life threatening levels. Pfizer, the drug company that manufactures Viagra, however has mentioned this on the prescription label. And cautions users not to take Viagra, if they use nitrate medication or have some form of pre-existing heart condition such as a heart attack or stroke.
Viagra should not be taken by people who:
Take nitrate medications for angina. Nitrates include nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, Minitran, Deponit), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO).
Have had a heart attack or stroke within the last 6 months
Have coronary heart disease and suffer from low blood pressure
Have liver or kidney problems
Have blood disorders such as leukemia or sickle cell anemia
Have any stomach ulcers or any bleeding disorders
Have a rare eye condition called retinitis pigmentosa or,
Are on other impotence medications.