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Lithium dehydration — GPhC CRA MCQ

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ModerateCNS TherapeuticsLithium dehydrationGPhC CRA

A patient taking lithium asks what to do during vomiting and diarrhoea. What would you advise the patient?

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

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Correct answer: C — Seek medical advice promptly and maintain fluids because toxicity risk increases

Dehydration can raise lithium levels and precipitate toxicity. In this vignette, "Seek medical advice promptly and maintain fluids because toxicity risk increases" is the safest single best answer. The other options are less appropriate because they miss the key clinical risk, conflict with UK medicines guidance, or delay needed review.

Reference: BNF; NICE CKS