Final answer:
To find the number of 0.125 mg Lanoxin tablets required for a 0.250 mg dosage, divide the ordered dose by the dose per tablet, which results in 2 tablets needed.
Step-by-step explanation:
The student's question asks how many 0.125 mg tablets of Lanoxin are needed to achieve a dosage of 0.250 mg. Since each tablet contains 0.125 mg, the required dosage can be obtained by dividing the ordered dose by the dose per tablet. In this instance, you would divide 0.250 mg by 0.125 mg per tablet to get the number of tablets needed.
Calculation:
0.250 mg ÷ 0.125 mg/tablet = 2 tablets
Therefore, 2 tablets of Lanoxin will be given to the patient to meet the physician's order of 0.250 mg.