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
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).
The Rx (prescription) is written as follows:
Phenobarbital gr 1/2 po
Rx stands for 'recipe' and it is used to specify the medication, dosage form, dose, route of administration, and any special instructions for a patient.
To calculate the strength (S) of the phenobarbital in mg/tan, we need to convert the grain (gr) measurement to milligrams (mg).
1 grain (gr) is equivalent to approximately 64.79891 milligrams (mg).
Given that the prescription calls for half a grain (1/2 gr) of phenobarbital, we can calculate the strength (S) as follows:
S = (1/2 gr) * (64.79891 mg/gr)
S = 32.39946 mg/tan
Therefore, the strength of the phenobarbital is 32.39946 mg/tan.