Pentobarbital will lower the extent or impact of fesoterodine by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Observe. Barbiturates tend not to impair usual hepatic functionality, but have already been shown to induce liver microsomal enzymes, thus raising and/or altering the metabolism of barbiturates together with other medicines. (See “DRUG INTERACTIONS” https://elliottrxelr.bloggip.com/36005739/detailed-notes-on-order-nembutal-pills-online