The physician orders nitroglycerin tablets gr 1/150 sublingual every 5 minutes up to three tablets for chest pain. The medication is supplied in 0.4-mg tablets. The patient took three tablets. How many milligrams did she receive? Round to the nearest tenth.

Choice A reason: 0.8 mg assumes two 0.4-mg tablets, but the patient took three. Nitroglycerin gr 1/150 equals 0.4 mg per tablet, so three tablets total 1.2 mg, making 0.8 mg incorrect. Choice B reason: Nitroglycerin gr 1/150 is 0.4 mg per tablet. Three tablets (0.4 mg × 3 = 1.2 mg) were taken, matching the order. Rounded to the nearest tenth, 1.2 mg is correct. Choice C reason: 1.6 mg assumes four 0.4-mg tablets or a miscalculation. The patient took three tablets (1.2 mg total), making 1.6 mg incorrect for the administered dose. Choice D reason: 2.0 mg significantly overestimates the dose. Three 0.4-mg tablets total 1.2 mg, not 2.0 mg, making this incorrect based on the supplied medication strength.