Final answer:
To administer a Codeine dosage of gr 1/4 IM every 3hrs PRN with Codeine 30mg/ml on hand, convert the grain measurement to milligrams, and then calculate the volume in milliliters.
Step-by-step explanation:
The question involves the calculation of medication dosage, which is a common task in the field of medicine and nursing. The doctor has ordered Codeine gr 1/4 or codeine 0.25 grams .
To calculate how much to administer, convert grains to milligrams and then divide by the concentration of the solutions
Therefore, you will administer 0.5417 ml of Codeine 30mg/ml intramuscularly every 3 hours as needed.