ArticleClinical case reports2026
Systematic Management of a Critical CYP3A4 Interaction Between Cabozantinib and Carbamazepine: A Case Report of a Clinically Relevant Pharmacokinetic Interaction.
Article in Clinical case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This was the case of a 62-year-old patient treated with cabozantinib and nivolumab for metastatic clear cell renal cell carcinoma, in whom a clinically significant pharmacokinetic interaction with carbamazepine was observed. Carbamazepine, a potent inducer of CYP3A4, caused a major decrease in systemic exposure to cabozantinib, as confirmed by a residual plasma concentration well below the therapeutic target. An adaptation strategy based on identifying the interaction, gradually replacing carbamazepine with a noninducing anticonvulsant, temporarily adjusting the cabozantinib dosage, and close pharmacokinetic monitoring made it possible to restore effective concentrations without toxicity or neurological decompensation. This optimization was accompanied by a significant clinical improvement and radiological tumor control. This case has led to the ongoing need for a medication review before initiating this type of cancer treatment and the implementation of pharmacokinetic monitoring when an interaction was detected.
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