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Liquid formulation calculation check — GPhC CRA MCQ

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ModerateDispensing and SupplyLiquid formulation calculation checkGPhC CRA

A prescription asks for sodium valproate liquid 200 mg twice daily. The stock bottle is 200 mg/5 mL, and the trainee has labelled 5 mL twice daily. The patient is a child. What is the most appropriate action?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: D — Check the calculation and supply 5 mL twice daily if appropriate

The concentration is 200 mg in 5 mL, so 200 mg corresponds to 5 mL. Paediatric liquid doses require careful independent calculation checks. Formulation changes should consider the child's ability to take the medicine and prescriber intent. Diluting the stock bottle would be inappropriate.

Reference: BNF; MEP