비아그라에 대해 알려지지 않은 사실
take any medicines identified as nitrates, frequently prescribed for chest ache, or guanylate cyclase stimulators like Adempas (riociguat) for pulmonary hypertension. Your blood pressure could drop to an unsafe levelan erection that won't go away (priapism). When you have an erection that lasts over 4 several hours, get professional medical enable