Question

a nurse is providing instruction to a client who has a new prescription for diphenhydramine 25 mg po every 6 hr. available is diphenhydramine syrup 12.5 mg/5 ml. how many tsp should the nurse instruct the client to take per dose? (round the answer to the nearest whole number. use a leading zero if it applies. do not use a trailing zero.)

Explanation:

Step1: Calculate volume in mL

First, find the volume of the syrup in mL needed per dose. We know the concentration is 12.5 mg/5 mL and the prescribed dose is 25 mg. Let the volume be $V$. Using the proportion $\frac{12.5\ mg}{5\ mL}=\frac{25\ mg}{V}$. Cross - multiply: $12.5V = 25\times5$. Then $V=\frac{25\times5}{12.5}=10$ mL.

Step2: Convert mL to tsp

Since 1 tsp = 5 mL, to convert 10 mL to tsp, we use the conversion formula. Let the number of tsp be $x$. Then $x=\frac{10\ mL}{5\ mL/tsp}=2$ tsp.

Answer:

2