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A nurse practitioner prepares an injection of promethazine, an antihistamine used to treat allergic rhinitis. If the stock bottle is labeled 20. mg/mL and the order is a dose of 10.0 mg , how many milliliters will the nurse draw up in the syringe?

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\(d=20\frac{mg}{mL}\\ m=10mg\\ V=?\\\\ d=\frac{m}{V} \ \ \ \ \Rightarrow \ \ \ \ V=\frac{m}{d}=\frac{10mg}{20\frac{mg}{mL}}=0,5mL\)

Nurse will draw up 0,5mL in the syringe.

Answer:

0.5 milliliters will the nurse drew up in the syringe

Explanation:

Stock bottle is labeled 20 mg/mL

In 1 mL of the solution there are 20 mg of the promethazine.

Volume of medicine required for the 10.0 mg of the dose.

\(\frac{1}{20 mg}\times 10.0 mg = 0.5 mL\)

0.5 milliliters will the nurse drew up in the syringe

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