Viagra (sildenafil) is a phosphodiesterase (PDE) inhibitor efficient in the treatment of erectile dysfunction that can be used by males that have trouble getting and maintaining their erection. This medicine should be taken when needed but not more often than every 24 hours. Taking Viagra more often can lead to an overdose with such symptoms experienced as fainting, irregular heartbeat, chest pain, nausea, and light-headedness. Seek emergency medical help if you have taken too much of Viagra. To avoid interactions you will need to take Viagra without combining it with any other medications. You will need to tell your doctor if you are going to start taking efavirenz, rifampin, medications for high blood pressure, alpha blockers, seizure medications, rifabutin, bosentan, erythromycin, other erectile dysfunction meds, amlodipine, certain antifungals, cimetidine, nevirapine, anticoagulants, HIV protease inhibitors, beta blockers, or barbiturates, as some of those drugs have been reported to cause interactions with Viagra. Never give this medicine to other people and always make sure you take Viagra exactly as recommended.
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