Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Drug class: Agents for pulmonary hypertension. Medically reviewed by Philip Thornton, DipPharm. Last updated on Uses. Warnings. Before taking. Dosage. Side effects.If you ever need emergency medical treatment for a heart problem, the healthcare providers who treat you will need to know when you last took sildenafil. Do not start these medications while taking sildenafil without discussing it with your healthcare provider. Tell your doctor if sildenafil is not working well or if you are experiencing side effects. Oral medicines for ED usually work well and cause few side effects. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. · 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. Comments: This drug may be taken anywhere from 30 minutes to 4 hours before sexual activity. Use: Treatment of erectile dysfunction.  · Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra Drug classes: Agents for pulmonary hypertension, Impotence agents Medically reviewed by Kaci Durbin, MD. Last updated on Uses Warnings Before taking Dosage Side effects Interactions FAQ What is sildenafil?  · Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where .These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. Sildenafil may cause side effects. If you are taking sildenafil for erectile dysfunction, your doctor will probably start you on an average dose of sildenafil and increase or decrease your dose depending on your response to the medication. It might work longer if you have mild to moderate erectile dysfunction. As with sildenafil, a high-fat meal or alcohol keep the body from absorbing it as quickly.

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