Tagrisso and Caffeine

Osimertinib may reduce the blood levels and effects of caffeine. Contact your doctor if your symptoms worsen or your condition changes during treatment with these medications. Your doctor may be able to prescribe alternatives that do not interact, or you may need a dose adjustment or more frequent monitoring to safely use both medications. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

MONITOR: Coadministration with osimertinib may decrease the plasma concentrations of drugs that are primarily metabolized by CYP450 1A2. In vitro, osimertinib has been shown to be an inducer of the isoenzyme. However, no pharmacokinetic data are available from drug interaction studies.

MANAGEMENT: Caution is advised when osimertinib is prescribed with drugs that undergo metabolism by CYP450 1A2. Dosage adjustments as well as clinical and laboratory monitoring may be appropriate for some drugs whenever osimertinib is added to or withdrawn from therapy. Sensitive CYP450 1A2 substrates or substrates with narrow therapeutic ranges (e.g., theophylline) should preferably be avoided with osimertinib, if possible.