A nurse practitioner prepares an injection of promethazine, an antihistamine used to treat allergic rhinitis. If the stock bottle is labeled 15 mg/mL and the order is a dose of 12.0 mg, how many milliliters will the nurse draw up in the syringe?
Express the volume in milliliters to two significant figures.
The nurse will draw up in the syringe 0.80 mL of the promethazine.
To determine the volume in milliliters that the nurse should draw up in the syringe, we can use the formula:
Volume (mL) = Dose (mg) / Concentration (mg/mL)
Given that the dose is 12.0 mg and the concentration is 15 mg/mL, we can plug these values into the formula:
Volume (mL) = 12.0 mg / 15 mg/mL
Now let's calculate:
Volume (mL) = 0.8 mL
Therefore, the nurse should draw up 0.8 mL of promethazine in the syringe.