This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.
Serious. These medicines may interact and cause very harmful effects. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Rifampin may speed up how quickly your liver processes irinotecan.
What might happen:
The amount of irinotecan and the active metabolites in your blood may decrease and they may not work as well.
What you should do about this interaction:
Let your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together. Your doctor may want to check the amounts of irinotecan in your blood and may want to adjust the dose of your medicine while you are taking rifampin.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
1.Camptosar (irinotecan hydrochloride) US prescribing information. Pharmacia & Upjohn Company December, 2014..