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Ask the Experts about Managing Side Effects of HIV Treatment
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Viagra & Duovir
May 23, 2009

Dear Dr, I would like to know if there's any side effect or resistance problem if I take viagra pills. I am now on treatment and taking Duovir and Efavir. Thank you

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   Response from Dr. Henry

There may be an interaction between efavirenz and Viagra so that those drugs need to be be used carefully together. The major concern is that Viagra would be less effective so that higher doses might need to be used due to the effect of efavirenz on increasing how rapidly Viagra is cleared from the blood. KH



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