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“Verapamil, cimetidine, carbamazepine, quinidine , and desipramine inhibited the carnitine uptake but required supratherapeutic concentrations, suggesting robustness of the carnitine uptake systems against xenobiotic challenge.”
American journal of physiology. Regulatory, integrative and comparative physiology • 2006 | View Paper
“ Carnitine uptake was also noncompetitively inhibited by verapamil and quinidine , inhibitors of the multidrug resistance family of membrane transporters, suggesting that the carnitine transporter may share a functional motif with this class of transporters.”