Viagra.

Viagra (sildenafil) can be taken by male patients diagnosed with erectile dysfunction and unable to complete sexual intercourse because of their erection not being hard enough to penetrate. Viagra is taken about an hour before having sex and sexual stimulation is required for the patient to become sexually aroused and get an erection. Viagra can interact with other meds you are using, so make sure you tell your doctor if you are taking antidepressants, imatinib, antifungal medications, antibiotics, rifampin, isoniazid, HIV/AIDS medicines, bosentan, heart or blood pressure medications, diclofenac, cimetidine, conivaptan, or enoxacin. Never combine Viagra with nitrate-based meds that you may be taking. Nitrates come as pastes, tablets, patches, sublingual tablets, sprays, or ointments, so it's important for you to be sure whatever medicines you are using are not nitrates. Combining them with Viagra may lead to a sudden drop in blood pressure. Viagra side effects include the following symptoms: upset stomach, headache, stuffy nose, back pain, memory problems, as well as warmth or redness in your face or chest. More serious side effects are possible but very unlikely, provided that you always take Viagra as recommended and never exceed the dose prescribed.