Pharmaceutical formulas

Question

Determine the correct dose of a drug 15 mg/kg to be administered for a patient who weighs 55 pounds and is 8 years old.
Multiple Choice

 

125 mg
250 mg
375 mg
425 mg

Answer 1

Answer:  375 mg

 

Step 1: Convert weight in lbs to kg

 

1 kg = 2.2 lbs  55/2.2 = 25 kg

 

Step 2: Calculate the dosage based on the child's weight in kg

 

Ratio and proportion method is very helpful

 

15 mg  =  x mg

 1 kg          25 kg

 

Cross multiply

 

15 * 25 = 1x

 

x = 375 mg