Agents inducing CYP3A metabolism Co-administration of TORISEL with rifampicin, a potent CYP3A4/ 5 inducer, had no significant effect on temsirolimus Cmax (maximum concentration) and AUC (area under the concentration vs. time curve) after intravenous administration, but decreased sirolimus Cmax by 65% and AUC by 56%, compared to TORISEL treatment alone.