Head-to-head comparisons of medication uses, side effects, warnings, and more.
Sildenafil (Revatio) and sildenafil (Viagra) are both medications that belong to the PDE-5 inhibitor class and contain the same active ingredient, sildenafil. They are used to treat different conditions: Revatio is FDA-approved for pulmonary arterial hypertension (PAH), while Viagra is FDA-approved for erectile dysfunction (ED). Revatio is taken three times a day in doses of 10 mg or 20 mg, whereas Viagra is taken as needed, typically 50 mg about an hour before sexual activity, with a maximum dose of 100 mg. Revatio is available in oral, liquid, and injection forms, while Viagra is only available as an oral tablet. Both medications are available as a lower-cost generic. Common side effects include headache, flushing, and indigestion. You should not take either medication with nitrates, like nitroglycerin or isosorbide. Doing so can lead to dangerously low blood pressure.
Sildenafil (Revatio) is used to treat pulmonary arterial hypertension (PAH) in children and adults. It improves your ability to exercise and can help prevent PAH from getting worse.
Sildenafil (Viagra) is a tablet that's taken by mouth for erectile dysfunction (ED) in adults. It works as a phosphodiesterase-5 (PDE-5) inhibitor to help people get an erection or keep an erection that lasts for sex. You only take a dosage when you need it (usually about an hour, or anywhere from 30 minutes to 4 hours, before sex). Take sildenafil (Viagra) no more than once a day. Otherwise, it can put you at risk of serious side effects, such as vision loss or low blood pressure. Other more common side effects include headache and flushing. Sildenafil (Viagra) is a brand-name and generic medication.
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