Question

order zidovudine (retrovir) 100 mg by nasogastric tube every 6 hrs
supply: retrovir 50mg/5 ml

Explanation:

Step1: Determine the concentration of the supply

The supply has a concentration of $\frac{50\text{ mg}}{5\text{ mL}} = 10\text{ mg/mL}$.

Step2: Calculate the volume needed

We need 100 mg of the drug. Using the formula $V=\frac{m}{C}$, where $m$ is the mass of the drug and $C$ is the concentration. Substituting $m = 100\text{ mg}$ and $C=10\text{ mg/mL}$, we get $V=\frac{100\text{ mg}}{10\text{ mg/mL}} = 10\text{ mL}$.

Answer:

10 mL