Keep from freezing. Read and follow these instructions carefully before you start using sildenafil and each time you get a refill of your medicine. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. This medicine comes with a patient information leaflet. Please expect up to 4 to 6 weeks for reimbursement. You may take this medicine with or without food.According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with . He or she will tell you how much VIAGRA to take and when to take it. Get into the mood. You will not get an erection just by taking VIAGRA. You must be sexually stimulated for it to work. Take your time. VIAGRA usually starts to work within minutes. You may take it up to 4 hours before sexual activity.  · For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed.