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Drug Interactions between trimethoprim and tucatinib

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

trimethoprim tucatinib

Applies to: trimethoprim and tucatinib

MONITOR: Coadministration with inhibitors of CYP450 2C8 may increase the plasma concentrations of tucatinib, which is primarily metabolized by the isoenzyme. When gemfibrozil (600 mg twice daily), a potent CYP450 2C8 inhibitor, was administered with a single tucatinib dose of 300 mg, tucatinib peak plasma concentration (Cmax) and systemic exposure (AUC) increased by 1.6-fold and 3-fold, respectively.

MANAGEMENT: Increased monitoring is advised if tucatinib is coadministered with CYP450 2C8 inhibitors. Dosage adjustments may be required based on clinical response and tolerance.

References

  1. (2020) "Product Information. Tukysa (tucatinib)." Seattle Genetics Inc

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Drug and food interactions

No alcohol/food interactions were found. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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