You receive and order for phenobarbital gr 1/2 po. The phenobarbital you have on hand comes as 15mg/tan

What is the Rx? And S? Show all work

1 answer

Rx: Phenobarbital 1/2 grain (gr) PO
S: Take 1/2 tablet

To calculate the dosage, we need to convert grains (gr) to milligrams (mg):

1 grain (gr) = 65 mg

So, 1/2 grain (gr) = 65/2 = 32.5 mg

Given that the phenobarbital on hand comes as 15 mg per tablet, we need to find the number of tablets that contain 32.5 mg:

32.5 mg / 15 mg per tablet = 2.17 tablets

Since we cannot provide a fraction of a tablet, we round up the number of tablets to the nearest whole number.

Therefore, the patient should be given 3 tablets of phenobarbital.

Hence, the Rx is Phenobarbital 1/2 grain (gr) PO and the S is Take 1/2 tablet (3 tablets in total).