The products discussed in this site may have different product labeling in different countries. You can take sildenafil with or without food. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Tell your doctor if sildenafil is not working well or if you are experiencing side effects. However, if you take sildenafil with a high-fat meal, it will take longer for the medication to start to work.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. Erectile dysfunction in older men. Erections mainly involve the blood vessels. And the most common causes of ED in older men are conditions that block blood flow to the penis. These include. 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 If your pharmacy does not participate, you may be able to submit a request for a rebate in connection with this Savings Offer.