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Lithium monitoring — GPhC CRA MCQ

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HardCNS TherapeuticsLithium monitoringGPhC CRA

A 45-year-old man taking lithium MR tablets presents with tremor, diarrhoea and unsteadiness after a week of gastroenteritis. What monitoring is required?

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Correct answer: B — Urgent lithium level, renal function and electrolytes

Dehydration can increase lithium concentrations and precipitate toxicity. Symptoms such as tremor, diarrhoea and ataxia are concerning and require urgent lithium level and renal/electrolyte assessment. Lithium has a narrow therapeutic index.

Reference: BNF; NICE CKS