Much more severe negative effects are extremely unexpected yet possible, included that you always take Sildenafil as recommended and never ever surpass the dose suggested.
Do not share this medicine with people to which it was not suggested - everyone has to suffer from an extensive clinical examination before obtaining a prescription for Viagra.
See to it your wellness care provider knows that you are taking any one of the complying with medicines that could need your medical professional to adjust your dose: seizure medicines, barbiturates, HIV protease inhibitors, efavirenz, rifampin, anticoagulants, rifabutin, various other impotence therapy drugs, antifungals, erythromycin, alpha blockers, beta blockers, cimetidine, amlodipine, high blood tension medicines, and so on.