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A 34-year-old woman taking carbimazole for Graves disease presents with fever, malaise and two painful oral ulcers. She has a temperature of 38.7°C and mild cervical lymphadenopathy; the ulcers are not associated with dental caries or trauma. She has taken carbimazole for three months and has not started any other medicine. Which one of the following is the most appropriate next step?

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