c. Cross-multiply.
1 capsule = X capsules
250 mg
500 mg
250X = 500
d. Solve for "X." Label the answer.
X = 2 capsules
EXAMPLE: You are to give Ampicillin 375 mg P.O. Ampicillin is stocked in
250 mg scored tablets.
1 tablet = X tablets
250 mg
375 mg
250 X = 375
X = 1 1/2 tablets
PRACTICE: Try this one yourself. Then refer to the solution provided to
check your work.
You are to administer phenobarbital gr 1/2 P.O. to a patient.
On hand are 15 mg tablets.
SOLUTION:
1 tablet = X tablets
15 mg
gr 1/2
gr 1 =
gr 1/2
60 mg
X mg
60 mg = X mg
gr 1
gr 1/2
X = 30 mg
1 tablet
= X tablets
15 mg
30 mg
15 X = 30
X = 2 tablets
e. Round dosages for tablets, pills, and capsules to the whole or half.
MD0904
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