Final answer:
The correct dosage per administration is 22.5 mg of the drug, which is obtained by multiplying the volume of 4.5 ml by the concentration of 5 mg/ml. Since the dosage is to be given QID, the total daily dosage is 90 mg, calculated by multiplying the single dosage by four.
Step-by-step explanation:
The correct dosage of the drug to be given QID (four times a day) is calculated based on the ordered volume and the concentration of the drug. The veterinarian has ordered 4.5 ml of a drug with a concentration of 5mg/ml. To find the total dosage in milligrams (mg) per administration, we multiply the volume (in ml) by the concentration (mg/ml).
Dosage per administration: 4.5 ml × 5 mg/ml = 22.5 mg.
Since the medication is to be given QID, the total daily dosage would be four times the single administration dosage:
Total daily dosage: 22.5 mg × 4 = 90 mg.
Thus, the correct dosage per administration is 22.5 mg, and the total daily dosage is 90 mg.