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Managing Side Effects of HIV TreatmentManaging Side Effects of HIV Treatment
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Is cialis working less well with my new regimen?
Jul 16, 2008

Hello. After being on Reyataz and Epzicom for several years, I have just switched to Isentress and Truvada. I haven't experienced any notable side effects so far, but the last three times I've taken cialis, it's worked noticeably less well than usual. I usually have a strong erection and my penis feels harder even when I'm not having sex. These last times my penis has been about as hard or limp---depending on having stimulation or not---as if I had taken no ED drug at all.

I've searched the web for any possible interactions and haven't found anything. Other than this change in regimen, the only other change in my drugs has been adding Pancrease for pancreatic insuffiency. Is there any explanation for this change? I thought the cialis lot might have been defective, but the pills came from two different lots.

Thank you again for this very helpful forum.

Response from Dr. Henry

Your previous regimen with a protease inhibitor may have increased the blood levels of Cialis (a known interaction) which in some patients will result in a magnified/enhanced effect (in some patients might results also in more side effects). Such an effect is not expected with Isentress to my knowledge. KH

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