My Cart

0 Item(s): $0.00

You have no items in your shopping cart.

Sildenafil 20 Mg Dosage

Sildenafil 20 Mg Dosage

What is sildenafil?

Sildenafil is a prescription drug. It comes in the form of a tablet and suspension (liquid). Both are taken by mouth. It also comes in an intravenous (IV) form, which is only given by a doctor. Sildenafil oral tablet is available as the brand-name drugs Viagra and Revatio. It’s also available as a generic drug. Generic drugs usually cost less than the brand-name version. In some cases, they may not be available in every strength or form as the brand-name drug.

Why it's used

Sildenafil oral tablet is used to treat ED and PAH. Generic oral tablets are available for both conditions, but the brand-name drugs each treat only one of the conditions. This drug is used to treat ED. With ED, you’re unable to get or maintain an erection.This drug is used to treat PAH. With PAH, the blood pressure in your lungs is too high. Your heart has to work very hard to pump blood into your lungs.

How it works

Sildenafil belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. A class of drugs is a group of medications that work in a similar way. These drugs are often used to treat similar conditions. Sildenafil works in different ways, depending on the condition it’s being used to treat.

Serious side effects

The side effect rates of are based on a dosage of 50 mg in people with erectile dysfunction, as reported in clinical trials for the brand equivalent, Viagra (see the FDA package insert). Side effects may be different when sildenafil is used for other conditions or at different dosages. For example, in clinical studies of people with a type of high blood pressure who took 20 mg three times a day, the rates increase for headache (46%) and insomnia (7%), but the rates decreased for flushing (10%). For detailed rates and more information, see the FDA package insert for generic sildenafil.Serious side effects and their symptoms can include the following:

  • blurry vision
  • confusion
  • dizziness
  • fainting
  • lightheadedness
  • nausea or vomiting
  • sleepiness
  • weaknesschest pain
  • shortness of breath
  • dizziness
  • trouble speaking
  • confusion
  • nausea or vomiting
  • feeling lightheaded


Our goal is to provide you with the most relevant and current information. However, this information does not contain all possible side effects. Also, rates observed in the clinical trials of a drug may not reflect the rates observed in practice, and each person may respond to drugs differently. This information is not a substitute for medical advice. Always discuss possible side effects with a healthcare provider who knows your medical history.

Important warnings

This drug can cause priapism, which is an erection that won’t go away. If you have an erection that lasts more than 4 hours, call 911 or go to the nearest emergency room. If it’s not treated right away, this condition can cause permanent damage to your penis. This drug can cause sudden vision loss in one or both eyes. This can be a sign of a serious eye problem. If this occurs, stop taking sildenafil and call your doctor right away. This drug can cause hearing loss, tinnitus (ringing in your ears), or dizziness. If you have sudden hearing loss with or without tinnitus or dizziness, stop taking sildenafil and call your doctor right away.