A nurse practitioner prepares an injection of promethazine... The rest in description!!!

Question

A nurse practitioner prepares an injection of promethazine, an anihistamine used to treat allergic rhinitis. If stock bottle is labeled 25 mg/mL and the order is a dose of 12.5 mg, how many milliliters will the nurse draw up in the syringe?

Answer 1

You can use dimensional analysis to solve this.

(x ml)(25 mg/ml) = 12.5 mg

x = 12.5/25 = 0.5 ml

Answer 2

Mikayla

Supposing it was 30 mg/ml and 13 mg needed

30 mg in 1 ml

1 mg in (1/30) ml

13 mg in 13 x (1/30) ml = 0.433 ml

Use the same method with your numbers

Mike