Oral Tablet

MORE COMMON SIDE EFFECTS

The more common side effects of sildenafil can include:

nosebleeds

headaches

upset stomach

flushing (reddening and warming of the face)

trouble sleeping

fever

an erection that lasts longer than normal

respiratory infection

nausea

vomiting

bronchitis

pharyngitis (sore throat)

runny nose

If these effects are mild, they may go away within a few days or a couple of weeks. If they’re more severe or don’t go away, talk to your doctor or pharmacist.

SERIOUS SIDE EFFECTS

Call your doctor right away if you have serious side effects. Call 9-1-1 if your symptoms feel life-threatening or if you think you’re having a medical emergency. Serious side effects and their symptoms can include the following:

Low blood pressure. Symptoms can include:

blurry vision

confusion

dizziness

fainting

lightheadedness

nausea or vomiting

sleepiness

weakness

Increased shortness of breath or trouble breathing

Priapism (an erection that won’t go away). Symptoms can include:

an erection that lasts more than 4 hours

Vision problems. Symptoms can include:

sudden vision loss in one or both eyes

Hearing problems. Symptoms can include:

sudden hearing loss

tinnitus (ringing in your ears)

dizziness

Heart problems, such as heart attack, stroke, or irregular heart rate. Symptoms can include:

chest pain

shortness of breath

dizziness

trouble speaking

confusion

nausea or vomiting

feeling lightheaded

What is sildenafil?

Sildenafil is a prescription drug. It comes in the form of a tablet and suspension (liquid). Both are taken by mouth. This drug is also available in an intravenous (IV) form, which is only given by a doctor.

Sildenafil is available as a brand-name drug called Revatio. It’s also available as a generic drug. Generic drugs usually cost less. In some cases, they may not be available in every strength or form as the brand-name version. Talk to your doctor to see if the generic version will work for you.

Why it’s used

This drug is used to treat pulmonary arterial hypertension (PAH) in adults. With this condition, the blood pressure in your lungs is too high. Your heart has to work very hard to pump blood into your lungs. 

This drug slows down how fast your illness worsens. It also makes you more able to exercise.

How it works

This drug 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.

This drug works by relaxing the muscles and opening up the blood vessels in your lungs. This decreases the blood pressure in your lungs.

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