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viagra with nitrates
Dec 17, 2006

I take isosorbide dinitrate daily and I would like to try viagra. How long would I have to get off isosorbide before I could take viagra

Response from Dr. Pierone

Nitrates cannot be used with Viagra or the other medications for erectile dysfunction (Cialis and Levitra) because of a potentially fatal interaction. Isosorbide has a half of about 6 to 12 hours depending on the formulation. So taking this medication within 3 days of Viagra would not be prudent. But anyone who needs isosorbide in the first place would need to get clearance from their cardiologist before taking Viagra at all.

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