Final answer:
For a haloperidol prescription of 3mg twice a day, and 2mg tablets available, 2 tablets should be administered per dose, totaling 4 tablets per day.
Step-by-step explanation:
The order is for haloperidol 3mg PO twice a day. If the tablets available contain 2mg of haloperidol each, then you would need to administer 1.5 tablets per dose to meet the prescribed 3mg dosage. As you cannot give half of a scored tablet safely or accurately in a clinical setting, you would round up to the nearest whole tablet. Therefore, you would give 2 tablets per dose. Since the medication is to be taken twice a day, you would administer a total of 4 tablets each day to the patient.