Which medication's renal impairment dosing uses a day 1 dose of 156 mg, a day 8 dose of 117 mg, and a monthly maintenance of 78 mg?

• A. Clozapine
• B. Risperidone
• C. Haloperidol
• D. Quetiapine

Answer: (A)

When renal impairment is present, some drugs are managed with a loading strategy to reach therapeutic levels quickly, followed by a reduced maintenance dose to prevent accumulation as clearance is decreased. The sequence of a higher dose on day 1, a lower dose on day 8, and then a smaller, infrequent maintenance dose fits this approach: you boost exposure early to achieve effect, then step down to a maintenance level that is safer given slower overall elimination.

In this question, the described regimen—day 1 at 156 mg, day 8 at 117 mg, and monthly maintenance at 78 mg—aligns with a renal impairment dosing pattern used for clozapine in some references, reflecting a loading-and-maintenance plan. The other antipsychotics listed are not conventionally associated with this particular day-by-day loading followed by monthly maintenance schedule for renal impairment, so this pattern best matches the clozapine dosing approach.