Will not go your patch on to anybody else. It have to only be used from the person it's got been prescribed for.etravirine will lessen the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Stay clear of or Use Alternate Drug. Coadministration of fentanyl with CYP3A4 inducers may lead to your decrease in fentanyl