You can take it up to 4 hours before you want to have sex. The studies that established benefit demonstrated improvements in success rates for sexual intercourse compared with placebo. Based upon measurements of sildenafil in semen of healthy volunteers 90 minutes after dosing, less than 0. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. This increased blood flow can cause an erection.The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card. VIAGRA can cause your blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not take VIAGRA if you take any other medicines called “nitrates.” Nitrates are used to treat chest pain (angina). A sudden drop in blood pressure can cause you to feel dizzy, faint, or have a heart attack or stroke. AdDon’t go to the pharmacy without checking prices at GoodRx® first. No commitment or fees. Find the lowest price in your neighborhood & use our free coupons to save up to 80%Works for Whole Family · Prescription Discounts · No Credit Card Required · 5-Star Reviews”The lowest prices on specific drugs” – Family Circle.