Mass for Mass Questions
Given an amount of mass per tablet, how many tablets do you require?
Therefore 25 mg = 1/50 x 25 = 0.5 tablets
Example: Potassium Chloride is available as 10 mg per tablet. Potassium Chloride (K-Dur), 40 mg is ordered. How many tablets would the nurse administer?
Alternatively, 10 mg = 1 tablet
Therefore 40 mg = 1/10 x 40 = 4 tablets
Example: (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug C 0.35 mg P.O.
AVAILABLE: Drug C tabs 0.7 mg
Alternatively, 0.7 mg = 1 tablet
Therefore 0.35 mg = 1/0.7 x 0.35 = 0.5 tablets
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