glycerol phenylbutyrate will decrease the level or impact of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep an eye on. Glycerol phenylbutyrate is a weak inducer of CYP3A4. Monitor for reduced efficacy of CYP3A4 substrates that have a slim therapeutic index.If unavoidable, keep an eye on individuals for lack of