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Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where this enzyme works. Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. When a man is sexually stimulated, his body's normal response is to increase blood flow to his penis to produce an erection. By controlling the enzyme, sildenafil helps to maintain an erection after the penis is stroked. Without physical action to the penis, such as that occurring during sexual intercourse, sildenafil will not work to cause an erection.

Other names for this medication:
Caverta, Intagra, Kamagra, Penegra, Revatio, Silagra, Sildenafil, Sildenafila, Sildenafilo, Sildenafilum, Sildigra, Suhagra, Veega, Zenegra

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Sildenafil is approved to treat erectile dysfunction (ED) in men. With ED, you have trouble getting and keeping an erection that’s firm enough to allow you to have sex.

What causes an erection?

When you’re sexually aroused, either through sexual thoughts or touch, your brain sends messages to your penis. These messages cause certain chemicals to be released in your penis.

One of these chemicals, called cyclic GMP, relaxes and widens certain blood vessels in your penis. Cyclic GMP also relaxes the muscles around the erectile tissue in your penis that’s called the corpus cavernosum. These actions allow blood to flow into the corpus cavernosum, which causes your penis to get hard and become erect.

What happens with ED?

ED can occur if you have certain problems that affect your body’s ability to have an erection. The condition can result from problems with messages being sent from your brain. ED can also result from problems with blood flow into your penis.

What does Sildenafil do for ED?

Sildenafil works to treat ED by helping you have and maintain an erection. The drug does this by improving blood flow into your penis when you’re sexually aroused.

Sildenafil is a type of drug called a phosphodiesterase type 5 (PDE5) inhibitor. It works by inhibiting (blocking) the action of an enzyme called PDE5. (An enzyme is a protein that helps chemical reactions to happen inside your body.)

Normally, an erection goes away when PDE5 breaks down the cyclic GMP in your penis. But Sildenafil blocks the action of PDE5, so it allows cyclic GMP to keep working for a longer period of time than usual. This action improves blood flow to your penis and helps you to have and keep an erection.

Does Sildenafil increase a man’s sex drive?

No, Sildenafil doesn’t directly increase your sex drive. And it doesn’t make you sexually aroused. However, some men find that if Sildenafil works to treat their erectile problem, it also increases their sexual confidence. And this may lead to an increased sex drive.

How can I tell if Sildenafil’s not working?

Sildenafil may not work for everyone, and it may not work every time you take it.

If you’re sexually aroused, Sildenafil should work to help you have or keep an erection within 30 minutes to 2 hours. But if you don’t get an erection within 4 hours after taking a dose, Sildenafil didn’t work for you this time.

If the drug doesn’t work for you, you shouldn’t take another dose until at least 24 hours later. And talk with your doctor if you feel Sildenafil isn’t helping to treat your ED. They may recommend that you try a different medication for your ED.

How can I get Sildenafil to work?

It’s important to remember that Sildenafil only works if you’re already sexually aroused. Arousal may involve having sexual thoughts, looking at sexual images, masturbating, or engaging in foreplay.

But if you feel anxious, nervous, depressed, or stressed, your body may not respond well to sexual stimulation. If this is the case, try to relax, make yourself comfortable, and take your time. In addition, it’s best to avoid drinking a lot of alcohol. This is because consuming large amounts of alcohol can make it more difficult for you to get an erection.

If you’re having trouble getting an erection, even while using Sildenafil, talk with your doctor.

Is Sildenafil a blood thinner?

No, Sildenafil isn’t a blood thinner. Instead, it belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. (A class of drugs describes a group of medications that work in a similar way.) Sildenafil works by inhibiting (blocking) the action of a certain enzyme in your body.

Since Sildenafil has been released onto the market, there have been a few reports of bleeding in people who’ve taken the drug. However, there’s no evidence that Sildenafil caused these bleeding problems.

It’s not known if Sildenafil is safe for use by people with a bleeding problem. If you have any bleeding problems, talk with your doctor about whether Sildenafil is safe for you.


For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, Viagra may be taken anywhere from 4 hours to 0.5 hour before sexual activity. Based on effectiveness and toleration, the dose may be increased to a maximum recommended dose of 100 mg or decreased to 25 mg. The maximum recommended dosing frequency is once per day.

Ask your health care provider any questions you may have about how to use Viagra.


In studies with healthy volunteers of single doses up to 800 mg, adverse reactions were similar to those seen at lower doses but incidence rates and severities were increased.

In cases of overdose, standard supportive measures should be adopted as required. Renal dialysis is not expected to accelerate clearance as sildenafil is highly bound to plasma proteins and it is not eliminated in the urine.


Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F) away from moisture and heat. Throw away any unused medicine after the expiration date. Keep out of reach of children.

Side effects

The most common side effects associated with Sildenafil are:

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Side effect occurrence does not only depend on medication you are taking, but also on your overall health and other factors.


Patients should be reminded that sildenafil, when used for erectile dysfunction, offers no protection against sexually transmitted disease. Counseling of patients about protective measures, including the prevention of transmission of human immunodeficiency virus (HIV) infection, should be considered.

Sildenafil has no effect on bleeding time when taken alone or with aspirin. In vitro studies with human platelets indicate that sildenafil potentiates the antiaggregatory effect of sodium nitroprusside (a nitric oxide donor). There is no safety information on the administration of sildenafil to patients with a coagulopathy or active peptic ulcer disease. Therefore, sildenafil should be administered with caution to these patients.

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