Lithium and thiazide diuretic — GPhC CRA MCQ
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Correct answer: A — Thiazides can increase lithium concentration
Thiazide diuretics can increase lithium concentrations and toxicity risk. This makes thiazides can increase lithium concentration the single best answer in this scenario. The other options would either miss the key safety issue, delay appropriate review, or fail to meet the relevant clinical or professional requirement.
Reference: BNF interactions