Generic Viagra (Sildenafil)

Treat erectile dysfunction with an affordable FDA-approved medication that has the same active ingredient as “name brand” Viagra, but costs significantly less.

Through Rex MD, a licensed healthcare provider can prescribe sildenafil or another ED treatment online, if appropriate. No in-person doctor visit needed. Plus, you’ll get your medication quickly and discreetly with free, rush shipping.

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Save up to 95% Off with Generic Viagra® (Sildenafil)

Meet sildenafil

The more affordable, generic version of Viagra
Flexible dosage options
Taken on an as-needed basis for satisfying sex

How to take it

Always take sildenafil as instructed by your healthcare provider. It’s typically taken about one hour before you plan to have sex. After about 30 minutes, its effects will kick in, and for up to four hours, you are able to get hard if you are sexually excited. If you take sildenafil after a high-fat meal, it may take longer for the medicine to start working.

Common sildenafil side effects

Potential side effects can include flushing, headache, nausea, dizziness, chest or arm pain, and, in rare cases, changes in vision or loss of sight. Seek emergency care right away if you have an erection that lasts longer than four hours or it becomes painful. Do not drink alcohol to excess (more than five drinks) while taking this medication.

Prescription products require an online consultation with a physician who will determine if a prescription is appropriate.

Why sildenafil?

While it has the same active ingredient as branded Viagra®, sildenafil (the generic version of Viagra) is about 95% cheaper.

Sildenafil can be taken as-needed to help men achieve optimal erectile function. It’s good for guys who don’t want to take a pill every day.

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Inhibits PDE5

Sildenafil works by suppressing an enzyme called phosphodiesterase type 5 (PDE5).

Boosts blood flow

When PDE5 is suppressed, blood is able to move more freely to the penis.

Gets you hard

More blood flow allows for harder, longer-lasting erections with sexual stimulation.

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Free Prescription + Free Rush Delivery

Why choose Rex MD?

Rex MD helps eligible patients get prescription ED medications like sildenafil quickly, discreetly, and affordable — right from home. No in-person doctor visit needed.

The best price per pill, guaranteed
Free online consultation
Branded and generic treatment options
Fast, free delivery
Ongoing support from our care team

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How to take sildenafil

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ⓘ Important safety information ›

How to get sildenafil online through Rex MD

Free online consultation

Answering questions about your symptoms and health history.

Personalized review

If appropriate, a licensed physician will prescribe a treatment plan that meets your needs.

Fast, discreet shipping

Your medication will ship out in discreet packaging within two days.

Ongoing support

Contact our team anytime to discuss your treatment and make adjustments, if needed.

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Frequently asked questions about sildenafil

What is generic Viagra?

Sildenafil is the generic form of “name brand” Viagra. It’s used to treat erectile dysfunction.

How does sildenafil work?

Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection.

Does sildenafil lower blood pressure?

Sildenafil relaxes arteries throughout the body, which can cause your blood pressure to decrease. This can cause mild increases in heart rate. Patients with low blood pressure should use sildenafil with caution.

Can women take sildenafil?

While some research suggests sildenafil may benefit women with sexual dysfunction, the FDA has not approved it for use in women. In some cases, a doctor can prescribe it for off-label use. Women should not take sildenafil or any other prescription drug unless it's been prescribed by their doctor.

What does sildenafil look like?

Unlike branded Viagra, which comes in a blue diamond-shaped pill, sildenafil (generic Viagra) comes in white round or oval-shaped pills.

Is sildenafil safe?

Sildenafil is generally safe as long as you take the recommended dose and follow the instructions of your prescribing healthcare provider. Taking more than the recommended dose of sildenafil puts you at risk for serious side effects, such as heart problems, vision problems, or permanent damage to the penis.

Can I take 200 mg of sildenafil?

The highest recommended sildenafil dose for treating ED is 100 mg per day. Doses of 150 mg or 200 mg would be considered off-label use.

How much does sildenafil cost?

With Rex MD, patients can get sildenafil (generic Viagra) for as little as $6 a pill.

Is sildenafil (generic Viagra) as effective as “name brand” Viagra?

Yes. Sildenafil works the same as Viagra, but it costs less.

How long does sildenafil last?

The effects of sildenafil usually last about four hours, giving you a large time frame where you can have sex with optimal erectile function.

How long does sildenafil take to work?

The effects of sildenafil typically kick in about 30 minutes after you take it. That means, you should be able to achieve an erection with sexual stimulation.

Can you take sildenafil with alcohol?

If you have taken sildenafil, excessive alcohol consumption (more than a few drinks) can increase your likelihood of experiencing symptoms such as dizziness, lightheadedness, fainting, flushing, headache, and heart palpitations. You should avoid or limit the use of alcohol while taking sildenafil, and use caution when getting up from a sitting or lying position.