Viagra.

Viagra (sildenafil) is an efficient treatment of impotence, or erectile dysfunction. It is used as needed before having sex to make it possible for the patient to obtain a stable erection. You will need to follow all the recommendations of your doctor and never use more of Viagra that necessary. An overdose of Viagra can display the following symptoms: nausea, light-headedness, irregular heartbeat, chest pain, and fainting. Seek emergency medical help if you think you may have taken too much of this medicine. Your doctor is supposed to be warned if you are using any other medications besides Viagra – such as rifabutin, nevirapine, cimetidine, rifampin, seizure medications, other erectile dysfunction meds, bosentan, beta blockers, erythromycin, certain antifungals, amlodipine, anticoagulants, HIV protease inhibitors, efavirenz, alpha blockers, barbiturates, and medications for high blood pressure, as your dose may need to be lower to exclude the possibility of interactions. Viagra is usually well tolerated and only a few side effects can occur – such as back pain, warmth or redness in your face or chest, headache, memory problems, stuffy nose, and upset stomach.