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Question

How much time does Viagra take to start working? How does Viagra keep working?

Answer

For the strongest effect, take Viagra® about an hour before having intercourse. You can take Viagra® any time between 30 minutes and 4 hours before having sex. Viagra® does not cause an erection by itself. Instead, there must be sexual stimulation to cause an erection. Normally, it starts to work about 10 to 40 minutes after using a dose between 25 and 100 mg. Viagra's effects can last up to four hours, but it will lessen its effect after about two hours. If an erection lasts longer than four hours, be sure to call a doctor. Always take a prescribed medication as directed by a physician for the most effective and safest treatment.

Learn more about erectile dysfunction in our Health Encyclopedia.

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DISCLAIMER:
The information provided is not a substitute for medical advice. Consult your physician for diagnosis and treatment of your medical condition. Advances in medicine may cause this information to become outdated, invalid or subject to debate. Professional opinions and interpretations of the scientific literature may vary. Walgreens' terms of use and general warranty disclaimer apply to all services provided. If you are in need of immediate medical attention, contact your physician, poison control center or emergency medical professional. If you need to speak with a pharmacist for non-emergency matters, contact your local Walgreens pharmacist or call a Walgreens.com pharmacist toll-free at 1 (877) 250-5823.