A patient is prescribed 800 mg of quetiapine per day, divided into two doses. If quetiapine is available in 200 mg tablets, how many tablets should be given per dose?

Choice A reason: The total daily dose of quetiapine is 800 mg, divided into two doses, meaning each dose is 400 mg (800 mg ÷ 2). With 200 mg tablets, each dose requires 400 mg ÷ 200 mg = 2 tablets. This is the correct calculation for the number of tablets per dose. Choice B reason: Four tablets per dose would result in 800 mg per dose (4 × 200 mg), totaling 1600 mg daily, which doubles the prescribed daily dose of 800 mg. This is incorrect and could lead to an overdose. Choice C reason: Five tablets per dose would result in 1000 mg per dose (5 × 200 mg), totaling 2000 mg daily, far exceeding the prescribed 800 mg daily dose. This is incorrect and unsafe. Choice D reason: Three tablets per dose would result in 600 mg per dose (3 × 200 mg), totaling 1200 mg daily, which exceeds the prescribed 800 mg daily dose. This is incorrect and not aligned with the prescription.