Question

1. the physician orders seconal 200 mg p.o. h.s. p.r.n. it is available in 1 1/2 gr capsules. how many capsules will you administer?

Explanation:

Step1: Convert grains to milligrams

1 grain (gr) is approximately equal to 60 mg. So, if a capsule is 1.5 gr, then the mass of one - capsule in mg is $1.5\times60 = 90$ mg.

Step2: Calculate the number of capsules

The physician orders 200 mg p.o. Let the number of capsules be $n$. We know that the mass per capsule is 90 mg. So, $n=\frac{200}{90}=\frac{20}{9}\approx2.22$. Since we can't administer a fraction of a capsule in practice, and we need to meet the dosage as closely as possible without under - dosing, we would round up to 3 capsules.

Answer:

3