glycerol phenylbutyrate will minimize the level or result of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Watch. Glycerol phenylbutyrate is often a weak inducer of CYP3A4. Watch for lowered efficacy of CYP3A4 substrates which have a slim therapeutic index.darifenacin will improve the amount or result of triazolam