Why has your g p only given you 20mg of carbimazole when you have a very very high reading for hypothyroid?

Your GP may have prescribed 20mg of carbimazole as an initial dose to manage your hyperthyroid condition, rather than hypothyroidism, as carbimazole is typically used to treat hyperthyroidism by reducing thyroid hormone production. The dosage may be conservative to monitor your response to the medication and minimize potential side effects. Regular follow-up appointments will likely be needed to adjust the dosage based on your thyroid hormone levels and symptoms. Always discuss any concerns with your healthcare provider for personalized advice.