A patient is on phenytoin and amitriptyline. He c/o of dry mouth and urinary retention. His antidepressant dose has not change? What is the most likely explanation of the phenytoin dose?

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1. A patient is on phenytoin and amitriptyline. He c/o of dry mouth and urinary retention. His antidepressant dose has not change? What is the most likely explanation of the phenytoin dose?