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 treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus (HIV). The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a satisfactory erection to complete intercourse). Its use is now one of the standard treatments for erectile dysfunction, including for men with diabetes mellitus. Rare but serious adverse effects found through postmarketing surveillance include prolonged erections, severe low blood pressure, myocardial infarction (heart attack), ventricular arrhythmias, stroke, increased intraocular pressure, and sudden hearing loss. Care should be exercised by people who are also taking protease inhibitors for the treatment of HIV infection. Protease inhibitors inhibit the metabolism of sildenafil, effectively multiplying the plasma levels of sildenafil, increasing the incidence and severity of side effects. Those using protease inhibitors are recommended to limit their use of sildenafil to no more than one 25 mg dose every 48 hours. blocker (typically prescribed for hypertension or for urologic conditions, such as benign prostatic hypertrophy) at the same time may lead to low blood pressure, but this effect does not occur if they are taken at least 4 hours apart. Lasix is used for Cheap cialis pills Learn about Viagra Sildenafil Citrate may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Sildenafil learn about side effects, dosage, special precautions, and more on MedlinePlus. Find patient medical information for Sildenafil Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. This medicine is not recommended for use in pregnant women unless absolutely necessary. Your doctor will determine the appropriate course of treatment after evaluating all the risks and benefits associated with the use of this medicine. This medicine may be used in women only to treat pulmonary arterial hypertension. This medicine is not recommended for use in breastfeeding women unless absolutely necessary. Your doctor will determine the appropriate course of treatment after evaluating all the risks and benefits associated with the use of this medicine. Your doctor may advise you to discontinue the drug or to discontinue breastfeeding based on your clinical condition. This medicine may be used in women only to treat pulmonary arterial hypertension. Generic Name: sildenafil Product Name: Viagra Viagra is used to treat erectile dysfunction, more commonly known as impotence, in men. Viagra belongs to a group of medicines called phosphodiesterase type 5 inhibitors (PDE5 inhibitors). This is when a man cannot get, or keep, a hard erect penis suitable for sexual activity. It works by relaxing the blood vessels in your penis when you are sexually excited. This medicine is available only with a doctor’s prescription. This allows blood to flow into your penis, allowing you to get an erection in a natural way. The physiological mechanism responsible for the erection of the penis involves the release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation. NO then activates the enzyme, guanylate cyclase, which results in increased levels of cyclic guanosine monophosphate (c GMP), producing smooth muscle relaxation in the corpus cavernosum and allowing inflow of blood. Viagra tablets contain sildenafil (as citrate) equivalent to 25 mg, 50 mg or 100 mg sildenafil. 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