![]() ![]() Do not take more or less of it or take it more often than prescribed by your doctor. Take sildenafil at around the same times every day.įollow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. If you are taking sildenafil to treat PAH, you will probably take sildenafil three times a day with or without food. However, if you take sildenafil with a high-fat meal, it will take longer for the medication to start to work. You can take sildenafil with or without food. If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. Sildenafil usually should not be taken more than once every 24 hours. The best time to take sildenafil is about 1 hour before sexual activity, but you can take the medication any time from 4 hours to 30 minutes before sexual activity. Take sildenafil as needed before sexual activity. If you are taking sildenafil to treat erectile dysfunction, follow your doctor's directions and the guidelines in this paragraph. Sildenafil comes as a tablet and suspension (liquid) to take by mouth. Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus (HIV). If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. This increased blood flow can cause an erection. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Sildenafil is in a class of medications called phosphodiesterase (PDE) inhibitors. ![]() Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness). Sildenafil (Viagra) is used to treat erectile dysfunction (impotence inability to get or keep an erection) in men.
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