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Viagra (sildenafil) is a brand name prescription drug. The Food and Drug Administration (FDA) approved it to treat erectile dysfunction (ED) in adults.

Viagra is an oral tablet that contains the active drug sildenafil. Sildenafil is also available in generic form. Viagra is classified as a phosphodiesterase type 5 (PDE5) inhibitor.

For more information on Viagra dosage including its pill form, strengths, and how to take the drug, keep reading. For a full overview of Viagra, check out this article.

This article describes the typical Viagra dosages provided by the manufacturer of the drug. When taking Viagra, always follow the dosage prescribed by your doctor.

Below are details of the dosages of Viagra commonly used to treat erectile dysfunction (ED).

Viagra form

Viagra comes in the form of tablets that you swallow.

Strengths of Viagra

Viagra tablets are available in three strengths:

  • 25 milligrams (mg)
  • 50 mg
  • 100 mg

Typical dosages

The following information describes the dosages commonly recommended for erectile dysfunction. However, be sure to take the dosage prescribed by your doctor. Your doctor will determine the best dose for you.

You will probably start with a 50 mg dose of Viagra. You should ideally take Viagra about an hour before sex. You can take the medicine 30 minutes to 4 hours before you anticipate sexual activity.

Depending on your response to this dosage and any side effects you may have, your doctor may either increase your dose to a maximum of 100 mg or decrease your dose to 25 mg.

You should not take Viagra more than once a day. And you should only take it when needed.

Long term use

Viagra is intended for use as a long term treatment. If you and your doctor determine that Viagra is safe and effective for you, you will likely take it for the long term.

Below are answers to some frequently asked questions about Viagra dosages.

Is Viagra dosage based on age or weight?

Viagra dosage is not based on weight, but your age may affect your dosage.

Specifically, you may have a lower starting dose than usual if you are over 65 years old. For example, a 30-year-old may start at a dose of 50 milligrams (mg), while a 70-year-old may have an initial dose of 25 mg. This is because in the elderly, the body eliminates Viagra from your system more slowly.

If you have any questions about Viagra dosages for your age, talk to your doctor or pharmacist.

Is Viagra prescribed in doses of 100 mg, 150 mg or 200 mg?

The highest recommended dose of Viagra for the treatment of erectile dysfunction (ED) is 100 mg per day, according to the drug’s manufacturer. Doses of 150 mg or 200 mg would be considered as off-label use. “Off label” is when a drug is prescribed to treat a disease for which it is not approved, or at a dose that is not approved by the Food and Drug Administration (FDA).

If you have any questions about the highest dose of Viagra that is safe for you, talk to your doctor or pharmacist.

What is the dosage of Cialis compared to Viagra?

Cialis (tadalafil) and Viagra are both prescribed to treat erectile dysfunction. Neither drug should be taken more than once a day.

Viagra is used as needed, which means you only take one dose before sexual activity. Cialis can be prescribed for use as needed, but can also be prescribed for use once a day, every day (without dose planning around sexual activity). This is the biggest difference in the approved dosages of Cialis compared to Viagra.

If you have more questions about the comparison between Viagra and Cialis, check out this article. You can also talk to your doctor or pharmacist about it.

The dosage of Viagra prescribed by your doctor will depend on several factors. These include:

  • your age
  • other medicines you may take
  • how you respond to Viagra, including any side effects you may have

Other medical conditions that you have can also affect your Viagra dosage.

Dosage adjustments

Your doctor may prescribe a lower dose of Viagra than usual if you:

Your doctor can give you more information about the safest Viagra dosage for you, including information about factors that may affect your dosage.

Viagra comes in the form of tablets that you swallow. Usually, you will take your dose about an hour before sexual activity. But Viagra can be taken between 30 minutes and 4 hours before you plan to have sexual activity.

Viagra tablets can be taken with or without food. Keep in mind that meals that are high in fat (like a cheeseburger) may cause Viagra to take longer than usual to start working.

Do not take more than one dose of Viagra per day. This can increase the risk of serious side effects.

Viagra is not a medicine that you take every day. You will only take one dose as needed before sex, no more than once a day.

It is important that you do not use more Viagra than your doctor has prescribed. For some medications, taking more than the recommended amount may cause side effects or overdose.

If you take more than the recommended amount of Viagra

Call your doctor immediately if you think you have taken too much Viagra. Another option is to call the American Association of Poison Control Centers at 800-222-1222 or use their online tool. If you have severe symptoms, immediately call 911 or your local emergency number, or go to the nearest emergency room.

The dosages in this article are typical dosages provided by the manufacturer of the drug. If your doctor recommends Viagra, they will prescribe the dosage that is right for you. Always take the dosage prescribed by your doctor.

As with any medication, never change your dose of Viagra without your doctor’s advice. If you have any questions about which Viagra dosage is right for you, talk to your doctor.

In addition to knowing more about dosage, you may want other information about Viagra. These additional articles might be helpful:

  • Learn more about Viagra. For more information on other aspects of Viagra, see this article.
  • Side effects. To learn more about Viagra side effects, check out this article. You can also view Viagra patient information.
  • Drug comparison. To find out how Viagra compares to other erectile dysfunction (ED) drugs, such as Cialis, Levitra, and Stendra, read this article.
  • Details about your condition. For more details on ED, check out this list of related articles, as well as our Men’s Health Center.

Disclaimer: Medical News Today has done everything possible to ensure that all information is accurate, complete and up to date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare practitioner. You should always consult your doctor or other healthcare professional before taking any medicine. The drug information contained herein is subject to change and is not intended to cover all uses, directions, precautions, warnings, drug interactions, allergic reactions, or possible side effects. The absence of warnings or other information for a particular drug does not indicate that the drug or drug combination is safe, effective or appropriate for all patients or all specific uses.

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