What post-administration instruction should a nurse provide after giving phenytoin?

After administering phenytoin, it is important to instruct the client to brush their teeth after each meal. This is crucial because phenytoin can cause gingival hyperplasia, a condition where the gum tissue becomes swollen and overgrown, leading to an increased risk of periodontal disease. Maintaining good oral hygiene is essential in preventing these complications. By brushing thoroughly and regularly, the patient can help minimize the adverse effects on their gums and dental health.

While increased fluid intake, avoidance of physical activity, and dental checkups are relevant considerations for patients on phenytoin, they do not directly address the immediate oral health concerns linked to the medication. Encouraging increased fluid intake is important for overall health but does not specifically mitigate the risk of gingival overgrowth. Avoiding physical activity isn't generally necessary unless specific complications arise. Regular dental checkups are certainly beneficial, but they should complement, rather than replace, a diligent home oral hygiene routine that includes brushing after meals.