· 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.If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. If you are taking sildenafil to treat erectile dysfunction, follow your doctor’s directions and the guidelines in this paragraph. Do not press on the plunger of the syringe. If you experience a sudden loss of vision in one or both eyes, contact your doctor immediately. Do not mix the liquid with other medications or add anything to flavor the medication. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. Using this medicine with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases.Viagra. 50 mg orally 1 hour before sexual activity. may be increased to mg or reduced to 25 mg, depending on effectiveness and tolerance. not to exceed mg/day. Pulmonary Arterial Hypertension. Revatio. Oral: 5 mg or 20 mg 3 . · Initial dose: 50 mg orally once a day, as needed, 1 hour prior to sexual activity Maintenance: 25 to mg orally once a day, as needed, 1 hour prior to sexual activity Is generic Viagra available in the U.S.? More about sildenafil. Check interactions; Compare alternatives; Pricing & coupons; Reviews () Drug images; Latest FDA alerts (13). Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when you get sexually excited.It lasts 4 to 5 hours, or longer if you have mild to moderate ED. You should only be treated with one of these products at a time. Other uses for this medicine This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. These medicines are called PDE5 inhibitors. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse.
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