Which monitoring is essential for a patient who is on haloperidol and lithium to minimize risk?

• A. Monitor blood glucose.
• B. Monitor potassium levels.
• C. Monitor lithium levels and extrapyramidal side effects.
• D. Monitor kidney function.

Answer: (C)

The main idea here is that this combination requires careful tracking of both drug levels and movement-related side effects. Haloperidol, a typical antipsychotic, can cause extrapyramidal symptoms (EPS) such as tremor, rigidity, slowed movements, and restlessness because it strongly blocks dopamine pathways in the brain. Lithium, a mood stabilizer with a very narrow therapeutic window, needs regular monitoring of its blood levels to prevent toxicity, which can affect the nervous system, kidneys, and thyroid. When used together, you want to watch lithium levels to stay within the safe range and actively look for EPS so you can adjust treatment promptly if movement disorders appear. Monitoring kidney function is important for lithium long-term, but the most essential checks to minimize immediate risk with this combination are lithium levels and signs of extrapyramidal side effects.