A patient who has a seizure disorder is admitted to the hospital after an increase in seizure frequency, and the prescriber orders carbamazepine [Tegretol] 100 mg twice daily to be added to the patient's medication regimen
The nurse reviewing the patient's medical history notes that the patient is already taking lamotrigine [Lamictal] 375 mg twice daily. The nurse will contact the provider to discuss which action? a. Reducing the carbamazepine dose to 50 mg twice daily
b. Reducing the lamotrigine dose to 225 mg twice daily
c. Increasing the carbamazepine dose to 200 mg twice daily
d. Increasing the lamotrigine dose to 500 mg twice daily
D
Carbamazepine induces hepatic drug-metabolizing enzymes and can increase the rate at which lamotrigine and other drugs are metabolized; therefore, patients taking any of these drugs would need an increased dose. Reducing the dose of either drug is not indicated. Increasing the dose of carbamazepine may be necessary but only after serum drug levels have been checked.
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