For CrCl 50-79 mL/min, what is the Clozapine dose?

• A. 25 mg/day
• B. 5 mg/day
• C. 50 mg/day
• D. 12.5 mg/day

Answer: (D)

In this scenario, the important point is starting low and titrating slowly when kidney function is reduced. Clozapine is mainly cleared by the liver, but mild to moderate renal impairment can still affect how a drug and its metabolites behave in the body. To minimize the risk of excessive sedation, hypotension, or other adverse effects while still allowing therapeutic response, a cautious, lower starting dose is used.

Therefore, 12.5 mg per day is a conservative starting point for someone with CrCl 50–79 mL/min. From there, the dose can be increased gradually if needed and well-tolerated, with careful monitoring. The other options represent doses that would be higher than a cautious initial start in this renal function range (and may be more appropriate for patients with normal renal function or in different titration contexts), or are excessively low and unlikely to achieve a therapeutic effect.

As with all Clozapine therapy, ongoing monitoring for adverse effects and regular white blood cell/absolute neutrophil count checks are essential.