Final answer:
The patient should be given 3 tablets of Cogentin 0.5mg to meet the doctor's prescribed dose of 1.5mg.
Step-by-step explanation:
The question involves calculating the correct dosage of medication, which is a common calculation in the medical field. The doctor's order specifies Cogentin 1.5mg to be taken by mouth (p.o.) once a day (QD). The Cogentin tablets available are 0.5mg each. To find out how many 0.5mg tablets are needed to make up the total 1.5mg dose, you would divide the ordered dose (1.5mg) by the strength of each tablet (0.5mg).
Ordered dose: 1.5mg
Strength of available tablet: 0.5mg
Number of tablets = Ordered dose ÷ Strength of tablet = 1.5mg ÷ 0.5mg = 3 tablets
Therefore, the patient should be given 3 tablets of Cogentin 0.5mg to meet the prescribed dose of 1.5mg.