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Viagra is approved for this use in males ages 18 years and older.

It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors.

(A class of drugs is a group of medications that act in a similar way.) Viagra works by increasing blood flow to your penis, which helps you have and keep an erection.

But this drug only works if you’re sexually aroused. In most cases, it should be taken about an hour before sexual activity, but it can be taken 30 minutes to 4 hours beforehand. Viagra is available in three strengths: 25 mg, 50 mg, and 100 mg.

In several clinical studies, Viagra was effective in treating ED. In these studies, men who used the drug had an improved ability to have and keep erections that allowed for successful sex. Across the studies, between 43% and 83% of men who took Viagra had improved erections. (These rates varied depending on the cause of their ED and the dosage of Viagra being used.) In comparison, improved erections occurred in 10% to 24% of men who took a placebo (no active drug). To learn more about Viagra’s effectiveness, see the “Viagra uses” section below.

A generic drug is an exact copy of the active drug in a brand-name medication. The generic is considered to be as safe and effective as the original drug. The following lists contain some of the key side effects that may occur while taking Viagra. These lists don’t include all possible side effects. For more information on the possible side effects of Viagra, talk with your doctor or pharmacist. They can give you tips on how to deal with any side effects that may be bothersome.

Note: The Food and Drug Administration (FDA) tracks side effects of drugs it has approved. If you would like to report to the FDA a side effect you’ve had with Viagra, you can do so through MedWatch.

Mild side effects of Viagra can include:* headache flushing indigestion mild and temporary vision changes, such as a blue tinge in your vision, blurred vision, and sensitivity to light nasal congestion (stuffy nose) back pain muscle pain nausea dizziness rash. Most of these side effects may go away within a few days or a couple of weeks.

But if they become more severe or don’t go away, talk with your doctor or pharmacist.

* This is a partial list of mild side effects from Viagra.

To learn about other mild side effects, talk with your doctor or pharmacist, or view the drug’s patient information . Serious side effects from Viagra aren’t common, but they can occur. Call your doctor right away if you have serious side effects.

Call 911 if your symptoms feel life threatening or if you think you’re having a medical emergency. Serious side effects and their symptoms can include: Non-arteritic anterior ischemic optic neuropathy (NAION), which is an eye condition that causes damage to your optic nerve. Symptoms can include: sudden decrease in vision in one or both of your eyes sudden loss of vision in one or both of your eyes Sudden decrease or loss of hearing.

This condition may also involve other symptoms, such as: tinnitus (ringing or buzzing in your ears) dizziness.

Other serious side effects, which are explained in more detail below in “Side effect details,” include: allergic reaction priapism (long-lasting and sometimes painful erection) low blood pressure, if Viagra is taken with certain other medications cardiovascular problems, such as heart attack, irregular heartbeat, or stroke, all of which occur mainly in people with heart disease.

You may wonder how often certain side effects occur with this drug . Here’s some detail on several of the side effects this drug may cause.

As with most drugs, some people can have an allergic reaction after taking Viagra.

In clinical studies, less than 2% of people who took Viagra had an allergic reaction.

It’s not known how often allergic reactions occurred in people who took a placebo (no active drug).

Symptoms of a mild allergic reaction can include: skin rash itchiness flushing (warmth and redness in your skin) A more severe allergic reaction is rare but possible. Symptoms of a severe allergic reaction can include: swelling under your skin, typically in your eyelids, lips, hands, or feet swelling of your tongue, mouth, or throat trouble breathing.

Call your doctor right away if you have a severe allergic reaction to Viagra. But call 911 if your symptoms feel life threatening or if you think you’re having a medical emergency. Rarely, Viagra can cause priapism, which is a long-lasting and sometimes painful erection. But it’s not known how often priapism occurs in men who take Viagra.

Priapism is a medical emergency that needs to be treated right away.

If it’s not treated, the condition can damage the tissues in your penis and cause irreversible erectile dysfunction (ED).

If you have an erection that lasts longer than 4 hours, go to the nearest emergency room or call 911.

Viagra can temporarily lower your blood pressure after you take the drug. In clinical studies, less than 2% of people who took Viagra had low blood pressure after taking the drug. It’s not known how often low blood pressure occurred in people who took a placebo (no active drug).

But keep in mind that a sudden drop in your blood pressure could be dangerous if you have certain heart conditions. Sudden low blood pressure may also be dangerous if you’re taking certain other medications.

For example, you shouldn’t take Viagra if you take nitrate medications to treat chest pain.

You should also avoid taking Viagra if you take a drug called riociguat (Adempas). Taking Viagra with these medications can cause a dangerous drop in your blood pressure that leads to heart attack or stroke.

If you have low blood pressure, taking Viagra could make you feel dizzy or lightheaded, or cause you to faint. You’re also more likely to have these problems if you take Viagra with certain drugs used to treat high blood pressure or enlarged prostate.

If you feel dizzy or faint after taking Viagra, lie down until this feeling passes. If you have a heart problem or low blood pressure, talk with your doctor about whether Viagra is safe for you. For more information about taking Viagra with other medications, see the “Viagra interactions” section below.

And for more information about taking Viagra if you have heart or blood pressure problems, see the “Viagra precautions” section below. On rare occasions, some people taking Viagra have had heart attack, stroke, or irregular heartbeat.

These conditions mainly occurred in people who already had a heart problem. But sometimes these conditions occurred in people who didn’t have real cialis without a doctor prescription a heart problem. It’s not known for sure if Viagra caused the side effects. If you have chest pain after taking Viagra, you should stop having sexual activity right away. But call 911 if your symptoms feel life threatening, or if you think you’re having a medical emergency. And if you have a heart problem, talk with your doctor before starting Viagra. They can discuss with you whether it’s safe for you to use this drug.

For more information about taking Viagra if you have heart problems, see the “Viagra precautions” section below. Headaches, as well as flushing and dizziness, occur because Viagra widens certain blood vessels in your body.

(The drug doesn’t just affect the blood vessels in your penis.) In clinical studies, headaches were reported in 16% to 28% of people who took Viagra.

(This percentage varied depending on the dose of Viagra used and how often the drug was taken.) In comparison, headaches were reported in 4% to 7% of people who took a placebo (no active drug). If you have a headache after taking Viagra, it should go away fairly quickly. But if it’s bothersome, you can take a pain reliever containing acetaminophen or ibuprofen.

Ask your doctor or pharmacist to recommend a medication that’s safe for you to use.

If you have a severe headache or a headache that won’t go away, call your doctor.

They’ll help determine the best treatment for your headache. Men ages 65 years and older tend to get higher levels of Viagra in their blood after taking a dose than younger men do.

Having a higher level of the drug in your

body

If you have concerns about using Viagra given your age, talk with your doctor.

Erectile dysfunction (ED) Taking Viagra doesn’t cause new or worsening ED. However, Viagra can sometimes cause priapism, which is a long-lasting and sometimes painful erection.

Priapism is a medical emergency that needs to be treated right away. If it’s not treated, priapism can damage the tissues in your penis and cause irreversible ED. If you have an erection that lasts longer than 4 hours, you should immediately go to an emergency room or call 911. Most of the mild side effects of Viagra either tend to go away within a few hours of taking your dose or can be easily relieved. For example, headaches, flushing, and dizziness can often be eased by lying down and resting. Avoiding alcohol will also help reduce these side effects. Headaches and sensitivity to light can also be improved by turning off any bright lights around you. If you have bothersome headaches with Viagra, ask cheap non prescription viagra your doctor or pharmacist to recommend a pain reliever that’s safe for you to use. If you get indigestion after taking Viagra, try taking your dose of Viagra with a snack or light meal. Just be aware that if you do this, Viagra may take slightly longer to start working for you. (This is especially true if you eat a high-fat meal with your dose.) If your indigestion is bothersome, ask your doctor or pharmacist to recommend medication to help reduce your discomfort.

Also keep in mind that certain side effects occur more often with higher doses of Viagra. These side effects include headaches, flushing, indigestion, nasal congestion, and changes in your vision. So if these side effects are a problem for you, talk with your doctor about taking a lower dosage of Viagra.

Don’t forget that some of Viagra’s rare side effects need immediate medical attention. For example, you should call your doctor right away if you have: an erection that doesn’t go away and lasts for more than 4 hours chest pain, dizziness, or nausea while you’re having sex, and these symptoms don’t go away when you stop having sex and begin to rest sudden loss of vision in one or both of your eyes sudden decrease or loss of hearing.

The Viagra dosage your doctor prescribes will depend on several factors. These include: your age whether you have liver or kidney problems other medical conditions you may have other medications you may be taking.

The following information describes dosages that are commonly used or recommended.

However, be sure to take the dosage your doctor prescribes for you.

Your doctor will determine the best dosage to fit your needs. It’s available in three strengths: 25 mg, 50 mg, and 100 mg. The typical dose of Viagra for erectile dysfunction (ED) is 50 mg. You can take this dose 30 minutes to 4 hours before you plan to have sexual activity. But for most people, it’s recommended that you take your dose about an hour before having sex.

Your doctor may prescribe a different dosage of Viagra for you depending on several factors.

These factors may include whether you have liver or kidney problems, or if you’re taking certain other medications.

If any of these factors apply to you, your starting dose might be 25 mg, which is lower than the typical recommended dose. If you have questions about the Viagra dosage that’s right for you, talk real cialis without a doctor prescription with your doctor.

And keep in mind that if Viagra isn’t working for you, your doctor may increase your dose of the drug. Below, we answer some common questions related to Viagra’s dosage.

Your dosage of Viagra won’t be based on your weight, but it may be based on your age.

For example, people ages 65 years and older tend to get higher levels of Viagra in their blood after taking a dose.

So, if you’re over 65 years of age, your doctor will usually recommend a starting dose of Viagra for you that’s lower than the typical starting dose. For example, they may recommend that you take 25 mg of the drug rather than 50 mg.

Can I take Viagra just for fun, even if I don’t have ED?