glycerol phenylbutyrate will lessen the level or impact of triazolam by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Monitor. Glycerol phenylbutyrate is often a weak inducer of CYP3A4. Watch for lessened efficacy of CYP3A4 substrates that have a slim therapeutic index.  The believed background chance of key beginning defect