sildenafil pill packet

The active ingredient in Viagra®


Sildenafil is the active ingredient in Viagra, which is FDA approved to treat ED. It improves blood flow to the penis by relaxing blood vessels and smooth muscle. The result is a harder and longer-lasting erection. We offer this popular ED treatment at a fraction of the brand name price.

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

* Risks of this medication can include flushing, headache, nausea, dizziness, chest or arm pain and in rare cases, changes in vision or loss of sight. Seek emergency care…Read more

This page has been medically reviewed by Peter J. Stahl, MD.

What is Sildenafil?

Sildenafil (aka, sildenafil citrate) is proven to combat erectile dysfunction and help you get hard when the time is right. Sildenafil citrate is a well known PDE5 inhibitor that has been prescribed by doctors across the US for the last 20 years, ever since the FDA approved Viagra in 1998.

Order Sildenafil online

Hims offers access to genuine sildenafil online. Through our platform, you can get evaluated for ED treatment discreetly, skipping in-person conversations, physical trips and complicated insurance issues. First, you'll be securely connected online to a medical provider licensed in your state to evaluate you and answer any questions. If determined to be appropriate by the provider, you can be prescribed sildenafil, tadalafil or other prescription ED drugs, which will be delivered right to your door at a pace that suits you. Ongoing adjustments are made simple by contacting a provider through our platform. Basically, we aim to redefine quality care.

How to take Sildenafil

Sexy time is meant to be sexy. Take sildenafil exactly as your provider tells you. Typically sildenafil is recommended to be taken on an empty stomach about an hour before you plan to get busy, and you should be able to keep that erection strong for as long as it’s needed. Ain't no one have time for bad sexy time.

Sildenafil side effects

Some men experience a tingly feeling in their body, headaches, temporary visual symptoms and other side effects from sildenafil. Make sure to read all the important safety information and other patient information that comes with your prescription. If you are experiencing side effects that are bothersome or persistent, use our platform to talk to a provider who can recommend adjustments to your treatment.

Viagra vs Sildenafil

The main difference is branding and price. Viagra is a brand name medication invented by Pfizer, while sildenafil (or sildenafil citrate) is the active ingredient in Viagra that’s responsible for its positive effects on treating erectile dysfunction.

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Important Safety Information

We’ve got answers

Frequently asked questions about Sildenafil

How does sildenafil work?
Sildenafil is a type of drug called a PDE5 inhibitor. PDE5 inhibitors work by blocking an enzyme called PDE5 (phosphodiesterase type 5), which in turn temporarily relaxes blood vessels and improves blood flow to the penis during sexual stimulation. For men who have trouble getting or staying hard, PDE5 inhibitors like sildenafil are typically the first line of treatment for erectile dysfunction.
What is sildenafil used for?
Sildenafil is used to treat erectile dysfunction by improving blood flow to the penis. Sildenafil is also used to treat pulmonary arterial hypertension by relaxing blood vessels in the chest near the heart and lungs. The PDE5 enzyme is active in both the lungs and penis, which is why sildenafil is approved by the Food and Drug Administration for the treatment of erectile dysfunction and pulmonary arterial hypertension.
How long does sildenafil last?
Sildenafil typically lasts for at least four and up to 8-12 hours, but its effect is strongest 2-4 hours after it’s taken. As the amount of sildenafil in the blood stream drops, so do the effects.
You should not experience erections that won't go away. If you have an erection that lasts more than 4 hours after taking sildenafil, get medical help right away.
How long does it take for sildenafil to take effect?
Sildenafil typically starts working in about 15-30 minutes, but its peak effect begins for most men about one hour after it’s taken on an empty stomach. Keep in mind that food in the stomach can delay the absorption of sildenafil by up to an hour, and also that the timing of each individual’s response is a little bit different.
Remember that sildenafil will only work when you are sexually aroused, but it should make it easier to get and sustain an erection during sexual intercourse.
How much sildenafil is too much?
In short, if you take more sildenafil than you were prescribed, that is too much sildenafil. You should take your prescribed dose (for example, 40mg, 60mg, 80mg or 100mg) no more than one time per day. Even if you have sex more than once per day, you still should only take sildenafil once.
If you feel that your prescribed dosage is not effectively treating your erectile dysfunction, message a provider through our platform.
Does sildenafil work?
Yes, sildenafil was found to improve erections in about two-thirds of men, according to a clinical study. If sildenafil does not work, it may be because it wasn’t taken soon enough before engaging in sexual activity, it was taken with food, or that the dosing is incorrect.
Some men try sildenafil 4-5 times before coming to conclusions about whether or not it works for them - the mind and body sometimes need time to acclimate to the medication. Message a provider through our platform if you are not happy with the effects of sildenafil.
What are the side effects of sildenafil?
The most common side effects of sildenafil include headache, muscle aches, back pain, stuffy or runny nose, dizziness, facial flushing, rash, upset stomach or nausea, blurred vision or other visual changes and lowered blood pressure. If any of these effects do not go away over time or are particularly bothersome, talk to your healthcare provider.
Serious side effects of sildenafil include sudden loss of vision, hearing problems and priapism, which is an erection lasting longer than four hours. These side effects are rare, but require immediate medical attention.
If you experience signs of an allergic reaction, such as hives or trouble breathing, seek emergency medical help.
Is sildenafil safe?
Sildenafil has been shown to be safe for most men with erectile dysfunction. However, men with certain pre existing medical conditions may be at greater risk for specific adverse effects.
If you have (or have ever had) heart problems (such as a heart attack), heart disease, irregular heartbeat, angina, chest pain, narrowing of the aortic valve, heart failure, heart surgery, pulmonary hypertension including pulmonary arterial hypertension, stroke, low blood pressure, high blood pressure, a deformed penis shape (Peyronie’s Disease), priapism (an erection that lasts for more than 4 hours), sickle cell anemia, multiple myeloma, leukemia, retinitis pigmentosa (a rare genetic eye disease), severe vision loss (such as NAION), bleeding problems, stomach ulcers, liver problems or kidney problems (such as kidney dialysis), you may be at higher risk for adverse effects.
If you have any of these health conditions, or any other health condition, tell your healthcare provider. Your provider should be aware of all medical conditions, prescription drugs and over-the-counter medications that you are taking.
Can I take sildenafil with other medications?
Sildenafil does have known drug interactions with some other prescription medications. Sildenafil interacts with nitrates (nitroglycerin), guanylate cyclase stimulators (riociguat), alpha-blockers, HIV protease inhibitors (ritonavir, indinavir sulfate, saquinavir, atazanavir sulfate), oral antifungal medicines (ketoconazole, itraconazole), antibiotics (clarithromycin, telithromycin, erythromycin) and other high blood pressure drugs.
Be sure to avoid taking sildenafil at the same time as any nitrate medications (eg, nitroglycerin, isosorbide, etc) or other PDE5 inhibitors, including Revatio®, Cialis® (tadalafil), Levitra® (vardenafil) and Stendra® (avanafil).
Better yet, give your provider a list of all medications you are taking to get professional medical advice.

If you are interested in a prescription, Hims will match you with an independent physician who will evaluate whether or not you are an appropriate candidate for the prescription product and if appropriate, may write you a prescription for the product.

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