There are several medications that are NOT OTC meds and some possibly are that will speed up the effect of many of these sorts of prescribed drugs. I did not personally do a search on each and everyone of them below, you will need to do that yourself. Some of the ones common are: drugs such as ritonavir, ketoconazole, itraconazole, troleandomycin, clarithromycin, nelfanivir, nefazadone, amiodarone, amprenavir, aprepitant, diltiazem, erythromycin, fluconazole, fasamprenavi, grapefruit juice(imagine that), and verapamil. many of the blood pressure meds speed things up. I would think that grapefruit juice most likely answer you may be looking for to speed up the process, and I also believe that ketoconazole is a medication for diarrhea so some are OTC meds. The info is as I stated info that is on the Maylan manufacturers web site for Fentanyl patch. I do know that all of the medications have went through a progressive reconfiguration of the methods in which they can be delivered after abuse of them and since they had so many deaths etc. My wife has taken grapefruit juice to enhance her patch and it worked good. It did enhance the speedup effect of that patch. So many abusers of these class of drugs they have no idea what they are doing to the real pain and opiate tolerant people. At any rate I do hope this helps in some good way to help you with your pain suffering. You may want to go the web site of your medication you asked about also, as it may tell which meds to NOT take while taking that drug also, "Because it Will Enhance Speeding Up The Effects". Good Luck
