A nurse is reinforcing teaching about phenytoin with a client who had a tonic-clonic seizure. Which of the following information should the nurse include in the teaching?

A. Taking ginkgo biloba increases phenytoin levels: Ginkgo biloba can actually decrease the effectiveness of phenytoin, not increase it. B. Taking phenytoin diminishes potassium levels: Phenytoin does not significantly affect potassium levels. C. Monitor for gingival hyperplasia: Gingival hyperplasia is a common side effect of phenytoin. D. Minimize exposure to sunlight: While this is a good practice, it is not as significant as monitoring for gingival hyperplasia with phenytoin use.