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Drug Interactions between Iressa and mobocertinib

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

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Interactions between your drugs

Moderate

gefitinib mobocertinib

Applies to: Iressa (gefitinib) and mobocertinib

GENERALLY AVOID: Coadministration with mobocertinib may decrease the plasma concentrations and therapeutic effects of drugs that are substrates of CYP450 3A4. The interaction may be significant for sensitive CYP450 3A4 substrates or those that demonstrate a narrow therapeutic index. The proposed mechanism is increased clearance due to mobocertinib-mediated induction of CYP450 3A4. Concomitant use of mobocertinib 160 mg once daily with oral or intravenous midazolam (a sensitive CYP450 3A4 substrate) decreased the midazolam systemic exposure (AUC) by 32% and 16%, respectively.

MANAGEMENT: Use of mobocertinib with sensitive CYP450 3A4 substrates or those that demonstrate a narrow therapeutic index (e.g., cisapride, ergot alkaloids, colchicine, fentanyl, macrolide immunosuppressants, midazolam, pimozide, triazolam, vinca alkaloids) should generally be avoided. If coadministration is required, patients should be monitored for diminished therapeutic effects. Clinical and laboratory monitoring should be considered whenever mobocertinib is added to or withdrawn from therapy with these drugs, and the dosage of the sensitive CYP450 3A4 substrate drug adjusted in accordance with the approved product label.

References

  1. (2021) "Product Information. Exkivity (mobocertinib)." Takeda Pharmaceuticals America
  2. (2022) "Product Information. Exkivity (mobocertinib)." Takeda UK Ltd
  3. (2022) "Product Information. Exkivity (mobocertinib)." Takeda Pharmaceuticals Australia Pty Ltd, EXKIVITY PI V1.0 (CC

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Drug and food interactions

Major

mobocertinib food

Applies to: mobocertinib

GENERALLY AVOID: Grapefruit juice may increase the plasma concentrations of mobocertinib. The mechanism may involve inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruit. Inhibition of hepatic CYP450 3A4 may also contribute. The interaction has not been studied with grapefruit juice. Based on drug interaction studies using model-informed approaches, coadministration of mobocertinib with multiple doses of itraconazole or ketoconazole (strong CYP450 3A4 inhibitors) is predicted to increase the steady-state combined molar AUC (systemic exposure) of mobocertinib and its active metabolites by 374% to 419%, while coadministration with multiple doses of a moderate CYP450 3A4 inhibitor is predicted to increase this value by approximately 100% to 200%. In general, the effect of grapefruit juice is concentration-, dose- and preparation-dependent, and can vary widely among brands. Certain preparations of grapefruit juice (e.g., high dose, double strength) have sometimes demonstrated potent inhibition of CYP450 3A4, while other preparations (e.g., low dose, single strength) have typically demonstrated moderate inhibition. Elevated plasma concentrations of mobocertinib may increase the risk for adverse effects such as QT prolongation, heart failure or reduced ejection fraction, cardiomyopathy, heart block, diarrhea, rash, stomatitis, fatigue, and musculoskeletal pain.

MANAGEMENT: Patients should avoid consumption of grapefruit and grapefruit juice during treatment with mobocertinib.

References

  1. (2021) "Product Information. Exkivity (mobocertinib)." Takeda Pharmaceuticals America
  2. (2022) "Product Information. Exkivity (mobocertinib)." Takeda UK Ltd

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Therapeutic duplication warnings

Therapeutic duplication is the use of more than one medicine from the same drug category or therapeutic class to treat the same condition. This can be intentional in cases where drugs with similar actions are used together for demonstrated therapeutic benefit. It can also be unintentional in cases where a patient has been treated by more than one doctor, or had prescriptions filled at more than one pharmacy, and can have potentially adverse consequences.

Duplication

Egfr inhibitors

Therapeutic duplication

The recommended maximum number of medicines in the 'EGFR inhibitors' category to be taken concurrently is usually one. Your list includes two medicines belonging to the 'EGFR inhibitors' category:

  • Iressa (gefitinib)
  • mobocertinib

Note: In certain circumstances, the benefits of taking this combination of drugs may outweigh any risks. Always consult your healthcare provider before making changes to your medications or dosage.

See also

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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.

Medical Disclaimer