Question

Calculate the following dosage: The physician orders promethazine 12.5mg PO. The medical assistant has on hand promethazine syrup that has a concentration of 25mg/5mL. How many mLs should the medical assistant administer to the patient?

A) 0.5mL
B) 1.0mL
C) 1.5mL
D) 2.5mL

Answer 1

The medical assistant should administer 2.5mL of promethazine syrup to the patient. The correct option is D.

Step-by-step explanation:

To calculate the dosage, we can use the following formula:

Dose ordered (mg) = Concentration (mg/mL) * Volume (mL)

In this case, we have the dose ordered as 12.5mg, and the concentration as 25mg/5mL. To find the volume of syrup to administer, we rearrange the formula:

Volume (mL) = Dose ordered (mg) / Concentration (mg/mL)

Plugging in the values:

Volume (mL) = 12.5mg / 25mg/5mL

Simplifying the expression:

Volume (mL) = 12.5mg / 5mg/mL

Volume (mL) = 2.5mL

Therefore, the medical assistant should administer 2.5mL of promethazine syrup to the patient.