glycerol phenylbutyrate will reduce the extent or result of triazolam by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Monitor. Glycerol phenylbutyrate is actually a weak inducer of CYP3A4. Watch for decreased efficacy of CYP3A4 substrates that have a slender therapeutic index.This info from Lexicomp® clarifies what you have