Dosing The dose of this medicine will be different for different patients. In healthy male volunteers, there was no evidence of a clinically significant effect of azithromycin mg daily for 3 days on the systemic exposure of sildenafil or its major circulating metabolite. If used together, your doctor may change the dose or how often you use this medicine, or give you special instructions about the use of food, alcohol, or tobacco. It continues to work for up to 4 hours, although its action is usually less after 2 hours. The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men.The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS . Buy Generic and Brand Viagra or sildenafil online, a generic erectile dysfunction medicine. Tracked 24/7 delivery. Lowest everyday prices pills with free shipping. Price Match Guarantee. Price $ Quantity: Decrease Quantity of Newport Guest Chair Increase Quantity of Newport Guest Chair. Total $ Lesro. Brooklyn Wood Guest. VIAGRA is supplied as blue, film-coated, rounded-diamond-shaped tablets containing sildenafil citrate equivalent to 25 mg, 50 mg, or mg of sildenafil. Tablets are debossed with PFIZER on one side and VGR25, VGR50 or VGR on the other to indicate the dosage strengths. Close.