A combination of the tyrosine kinase inhibitor—sorafenib—and the opioid analgesic— morphine—can be found in the treatment of cancer patients. Since both are substrates of Pglycoprotein (P-gp), and sorafenib is also an inhibitor of P-gp, their co-administration may affect their pharmacokinetics, and thus the safety and efficacy of cancer therapy. Therefore, the aim of this study was to evaluate the potential pharmacokinetic drug–drug interactions between sorafenib and morphine using an animal model................
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