Drugs & Medications Sildenafil Tablet Sildenafil Tablet – Uses, Side Effects, and More Common Brand (S): Viagra Generic Name (S): sildenafil Uses Sildenafil is used to treat male.Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider. Children 1 year of age and older weighing 45 kilograms kg or more—20 mg 3 times a day. Cialis tadalafil : This ED medication works with the same principle as Viagra, but lasts up to 36 hours. On the basis of distribution channel, the sildenafil market is segmented into hospital pharmacy, retail pharmacy, online pharmacy and others. Teva sued to have the latter patent invalidated, but Pfizer prevailed in an August federal district court case. Vardenafil usually works for 4 to 5 hours. You can take this medicine with or without food 30 minutes before sex, depending on the dose.Drug Facts Common Brands Viagra Drug Class PDE-5 inhibitor Controlled Substance Classification Not a controlled medication Generic Status Lower-cost generic available Availability Prescription only How Sildenafil (Viagra) works Sildenafil (Viagra) is a phosphodiesterase-5 (PDE-5) inhibitor. Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra Drug class: Impotence agents Medically reviewed by Sophia Entringer, PharmD. Last updated on Uses Warnings Before taking Dosage Side effects Interactions FAQ What is Viagra? Cart. Transfer your prescription for Sildenafil (Generic for Viagra, Oral Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime members.Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. This medication is taken with or without food an hour before sex. Brand names Why is this medication prescribed? How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. Generic versions of this low-dose form of sildenafil have been available in the U.