This medication is taken with or without food an hour before sex. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. These medicines are called PDE5 inhibitors. You can take this medicine with or without food 30 minutes before sex, depending on the dose. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension.the pharmacy you use whether Viagra has a savings program (see the “Financial and insurance assistance” section below) To find out what the average cost of . Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult . The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS .