Pharmaceutical calculations belongs to Therapeutics and patient care, which makes up about 45% of the Overseas Pharmacist Readiness Assessment (OPRA®). Answer each question yourself before opening the explanation.
B. 250 mg
The daily dose is 25 x 20 = 500 mg, divided into two gives 250 mg per dose. Reading whether a reference expresses the dose per day or per dose is the decisive step, since treating 20 mg/kg as the individual dose would double the intended daily amount.
C. 3.2 mL
The daily dose is 8 x 30 = 240 mg, divided into three gives 80 mg per dose. The suspension provides 25 mg/mL, so 80 divided by 25 gives 3.2 mL. Working stepwise from daily dose to individual dose to volume keeps each conversion visible and checkable.
C. 25 g
Per cent w/v means grams of solute in 100 mL of solution, so 5% w/v is 5 g per 100 mL. In 500 mL there are five such portions: 5 x 5 = 25 g. Keeping the definition in mind avoids the common slip of treating w/v as grams per litre.
These are 3 of the 80 questions on pharmaceutical calculations in the app.
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