Question

A nurse practitioner prepares an injection of promethazine, an antihistamine used to treat allergic rhinitis. If the stock bottle is labeled 30. mg/mL and the order is a dose of 15.0 mg , how many milliliters will the nurse draw up in the syringe?

Answer 1

Essentially what the question is asking you to find is the volume of promethazine the nurse will fill the syringe with. The question gives you :
- Density = 30 mg / mL
- Mass = 15.0 mg

Therefore you can solve using the formula:

`Volume = (mass)/(density)`
=
`(15 mg)/(30 mg / L)`
= 0.5 mL