Viagra Tabs Dosage Information

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Proper Method of Taking Viagra

Take Viagra tabs by mouth with a full glass of water.

Take 1 hour ahead of sexual activity. However, Viagra can be taken anywhere from 15 minutes to 4 hours ahead.

Do not take more than once in a 24 hour period.

Proper Dosage of Viagra

Your doctor needs to know your medical history, health conditions and what other medications/supplements you are taking in order to determine the proper dosage of Viagra. Follow your doctor's instructions exactly. Do not take more or less than what has been prescribed.

If Viagra is not working for you or if you experience side effects, tell your doctor. Your dosage may need to be adjusted.

Considerations for Viagra Dosage

• If you take alpha blockers for high blood pressure or prostrate problems, take the dose prescribed by your doctor. It may be as low as 5 mg.


• If you are taking an alpha blocker such as Cardura, do not take the 50 mg or 100 mg dose of Viagra. It may cause low blood pressure.


• If you take medication which affects your liver, your dose may need to be lower to no more that 25 mg a day. These drugs include:


• erythromycin
• indinavir (Crixivan)
• itraconazole (Sporanox)
• ketoconazole (Nizoral)
• ritonavir (Norvir)


• 65 years old or older, begin with 25 mg, once a day.


• If you have renal impairment, the recommended starting dose is 25 mg every 48 hours.


• If you have a liver disease, begin with 25 mg, once a day.

Viagra should not be taken more than once a day. You doctor may restrict you to once every 48 or 72 hours (2 or 3 days).

Viagra may take longer to work if you take it after you have eaten a meal high in fat such as a hamburger and French fries.

What Do You Do if You Forget a Dose?

Since Viagra is taken as needed, this is not a problem.

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