During the assessment, the nurse finds a client has a low white blood cell count while on carbamazepine. What action should the nurse consider?

When a client is on carbamazepine and presents with a low white blood cell count (leukopenia), it is crucial for the nurse to notify the healthcare provider. Carbamazepine can often cause this side effect, which can increase the risk of infection and other complications. By notifying the healthcare provider, the nurse ensures that the client's condition is assessed properly and timely interventions are made.

This step is essential because the healthcare provider might consider adjusting the medication regimen, performing further lab tests, or implementing monitoring strategies to protect the client’s health. Appropriately addressing changes in blood counts is vital in mitigating potential risks associated with the medication.

Continuing the medication as prescribed, increasing the dosage, or simply switching to another oral formulation would not address the immediate concern of leukopenia and could expose the client to unnecessary risks. Therefore, notifying the healthcare provider is the most appropriate and safest course of action in this scenario.