Answer:
To calculate the number of milliliters (mL) of a medication you should give when you have the dose and concentration, you can use the following formula:
Amount of Medication (mL) = Dose (mg) / Concentration (mg/mL)
In your case:
Dose (mg) = 12.5 mg
Concentration (mg/mL) = 25 mg/mL
Now, plug these values into the formula:
Amount of Medication (mL) = 12.5 mg / 25 mg/mL
Amount of Medication (mL) = 0.5 mL
So, you should give 0.5 milliliters of meperidine to achieve a 12.5 mg dose. Please make sure to follow proper dosage instructions and consult with a healthcare professional if you have any concerns or questions about medication administration.