Chantix (Champix) and drug resistance
Aug 15, 2007
Is there any known interaction between HAART medication and Champix (varenicline)? My husband is on HAART since October 2006. His doctor started him on Stocrin (efavirenz), but because he got really depressed from that, he switched to Viramune (nevirapine). In May this year he quit smoking, with support from Champix. Last month his doctor told him that he developed resistance to Viramune and therefore all NNRTI. Both medications work on the brain so... ? Do you know if Champix can have caused this resistance?
Thanks for all your support from The Netherlands.
Response from Dr. Young
Thank you for your post from The Netherlands, Mark.
It's highly unlikely that the varenicline (Chantix) was responsible for the drug resistance, since there isn't any known interaction between this medication and your husband's HIV meds.
Since the initial drug resistance mutations that cause drug resistance to efavirenz (Sustiva) and nevirapine (Viramune) differ, it's possible that your husband could have harbored the later and retained sufficient potency to efavirenz for the first regimen to work.
Either way, the presence of resistance now does likely impart cross resistance to all of the NNRTIs, a next drug regimen will probably include one of the newer ritonavir-boosted proteases.
Best of health to you and yours, BY
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