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Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men.
Sildenafil (Revatio) is used to improve the ability to exercise in adults with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness).
Children should not usually take sildenafil, but in some cases, a doctor may decide that sildenafil (Revatio) is the best medication to treat a child’s condition. Sildenafil is in a class of medications called phosphodiesterase (PDE) inhibitors.
Sildenafil is used for:
Treating high blood pressure in the lungs (pulmonary arterial hypertension [PAH]). It may also be used for other conditions as determined by your doctor.
Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor. It works by relaxing and dilating the blood vessels in the lungs. This lowers the blood pressure in the lungs and helps to improve your ability to exercise.
How to use Sildenafil
Sildenafil comes as a tablet and suspension (liquid; Revatio only) to take by mouth.
1:to treat erectile dysfunction, follow your doctor’s directions and the guidelines in this paragraph.
Take sildenafil as needed before sexual activity. 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. Sildenafil usually should not be taken more than once every 24 hours. If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. You can take sildenafil 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.
2.to treat PAH, follow your doctor’s directions and the guidelines in this paragraph.
You will probably take sildenafil three times a day with or without food. Take sildenafil at around the same times every day, and space your doses about 4 to 6 hours apart.
Do NOT use sildenafil if:
you are allergic to any ingredient in sildenafil
you have pulmonary veno-occlusive disease (PVOD)
you are taking nitrates (eg, isosorbide, nitroglycerin) in any form (eg, tablet, capsule, spray, patch, ointment) or nitroprusside
you take another medicine that contains sildenafil, another PDE5 inhibitor (eg, tadalafil, vardenafil), or ritonavir
you use certain recreational drugs called “poppers” (eg, amyl nitrate or nitrite, butyl nitrate or nitrite)
Contact your doctor or health care provider right away if any of these apply to you.