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You are seeing a 35-year-old male in a GP setting who you diagnosed with hyperthyroidism 3 months ago. His repeat thyroid function tests show slight improvement, but the patient is complaining that this medication is making him feel nauseas. He is also complaining of a headache as well as muscle and joint pain and would like to discuss the option of starting another type of medication. What is the most appropriate second-line treatment for an individual who has just been diagnosed with hyperthyroidism who can no longer tolerate carbimazole?