Rx · Prescription required

Sildenafil

Viagra® · Revatio®

FDA-approved for erectile dysfunction in adult men (Viagra®). A separate low-dose form (Revatio®) treats pulmonary arterial hypertension.

Drug class: PDE5 inhibitor
How it is given: Tablet, as needed
Prescription: Required
Dispensed by: DiRx Inc. · licensed pharmacy

FDA status: Viagra® and the other brand-name versions listed are FDA-approved medicines. Generic versions, where available, are FDA-approved equivalents.

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Pricing is shared after you speak with our team and a licensed doctor approves treatment. Clinics see pricing after account verification.

Talk to our team Call (954) 420-7747

Important safety information

Sildenafil is a prescription medicine. It is not right for everyone: anyone taking nitrates (nitroglycerin, isosorbide) or riociguat; recent heart attack or stroke, or unstable heart disease; severe liver disease; certain inherited eye conditions. Tell your doctor about every condition you have and every medicine and supplement you take.

Common side effects are described below. Stop and seek care for any severe or unexpected reaction. This page is education, not medical advice; your doctor and pharmacist give the instructions for your treatment.

How to get started

Message us on WhatsApp or call (954) 420-7747.
Talk with a licensed doctor, who reviews your health history and decides if this medicine is right for you.
If prescribed, our team shares pricing and a licensed pharmacy fills your order.

Plain-language guide

Sildenafil, explained by our clinical team

What it is

Sildenafil was the first oral treatment for erectile dysfunction, approved in 1998. It relaxes blood vessels in the penis so that, with sexual stimulation, an erection can happen and last.

It works for roughly four hours and is taken only when needed. Generic sildenafil is widely available and inexpensive.

FDA-approved uses

Erectile dysfunction in adult men

Our doctors prescribe for approved uses. Any other use is a decision made only by your doctor, for you, after evaluation.

How it is taken

One tablet about 30 to 60 minutes before sexual activity, no more than once a day. A heavy, fatty meal slows absorption.

What to expect

Improved ability to get and keep an erection with stimulation. Headache, flushing, stuffy nose, indigestion and temporary blue-tinted vision are the common side effects.

Who should not take it

Anyone taking nitrates (nitroglycerin, isosorbide) or riociguat
Recent heart attack or stroke, or unstable heart disease
Severe liver disease
Certain inherited eye conditions

Questions we hear

Does it work without stimulation?

No. It supports the natural response; it does not create desire or an automatic erection.

Sildenafil or tadalafil?

Sildenafil is shorter-acting; tadalafil lasts up to 36 hours or can be taken daily. Your doctor will help you choose.

Can I take it with blood pressure medicine?

Often yes, but alpha-blockers and nitrates need special care — tell your doctor everything you take.

Real molecular structure

The molecule: Sildenafil

Drag to rotate. Every atom and bond below comes from the public PubChem database of the U.S. National Institutes of Health; nothing is drawn by AI.

3D conformer — drag to rotateCNOS

Formula: C22H30N6O4S
Molar mass: 474.6 g/mol
Heavy atoms: 33
PubChem CID: 135398744 ↗

Source: PubChem, National Library of Medicine (public domain).

Watch & learn

Videos: how it works and how it is used

Independent videos from doctors, hospitals and health educators on YouTube. They are for general education; your doctor gives the instructions for your treatment.

How to use