A patient with diagnosed bipolar disorder was hospitalized 7 days ago and has been taking lithium 600 mg tid. Staff observes increased agitation, pressured speech, poor personal hygiene, and hyperactivity. Which action demonstrates that the nurse understands the most likely cause of the patient's behaviour?

Choice A reason: Educating a patient in an acute manic state about hygiene is ineffective. During mania, patients experience significant distractibility and poor impulse control. They are cognitively unable to process or retain complex instructions regarding social norms or grooming until their mood is stabilized through pharmacological interventions. Choice B reason: Increasing the dose without knowing the current serum concentration is dangerous. Lithium has a very narrow therapeutic index, typically between 0.6 and 1.2 mEq/L. Escalating the dose blindly could lead to lithium toxicity, which can cause permanent neurological damage, renal failure, or even death. Choice C reason: Lithium 600 mg tid (1800 mg daily) is a robust dose that should typically produce a therapeutic effect within 7 days. If the patient is still showing acute manic symptoms like pressured speech and hyperactivity, the nurse must suspect non-adherence ("cheeking" the pills) or subtherapeutic serum levels. Choice D reason: Monitoring and documentation are necessary nursing functions, but they do not address the underlying clinical problem. A patient who remains highly agitated after a week of high-dose lithium therapy requires an active intervention to determine why the medication is not producing the expected clinical response.