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I was on 20mg Carbimazole since 5 weeks ago following Graves diagnosis. The medicine was working really nicely on my hyperthyroidism symptoms up until 2 days ago when I developed a nasty hive and a very sore stomach. For one day I was lethargic, completely unable to do anything else then be in bed (which was a massive change from the hyperthyroid life I had! I haven't slept in the afternoon in years!). Today I feel much better but the endocrinologist by email suggested this is an allergic reaction to Carbimazole and told me to stop immediately.
When I told her how disappointed I was, she suggested I could start PTU straight away instead.
I am here looking for experiences of people going form Carbimazole to PTU. As well I would like to know how can I be sure this reaction was induced by Carbimazole and not by something else?
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