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HardPharmacologymrcgp aktmrcp part 1ukmlaprescribing safety assessment

A 25-year-old man with known epilepsy, well-controlled on lamotrigine 200mg BD, is started on a new medication by his psychiatrist for bipolar disorder. Two weeks later, he presents with a widespread erythematous macular rash, fever, and malaise. Blood tests show eosinophilia and mildly elevated liver enzymes. Which new medication is most likely to have caused this reaction?

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