Hyperthyroidism
Treatment of hyperthyroidism with antithyroid drugs
Carbimazole is associated with increased risk of congenital malformations, especially when administered in the first trimester of pregnancy and at high doses. Women of childbearing potential should use effective contraception during treatment with carbimazole. See Prescribing notes for MHRA link.
Carbimazole
Carbimazole 5mg tablets
Carbimazole 20mg tablets
Propylthiouracil may be an alternative in early pregnancy or for patients who suffer sensitivity reactions to carbimazole.
Propylthiouracil
Propylthiouracil 50mg tablets
Prescribing Notes:
- Patients should be counselled on of the importance of recognising bone marrow suppression induced by carbimazole and the need to seek medical advice.
- See also MHRA Drug Safety Update (February 2019) regarding use of Carbimazole in pregnancy and in those with childbearing potential.
History Notes
30/07/2026
Regional formulary chapter launched.
Treatment of hyperthyroidism with beta blockers (symptomatic treatment)
Propranolol
Propranolol 10mg tablets
Propranolol 40mg tablets
Prescribing Notes:
- Propranolol can be considered for the symptoms of hyperthyroidism such as tremor, rapid heart rate and palpitations. It does not treat the underlying condition.
- Prescribers should note recent updates on risk of overdose and ensure patients are counselled appropriately.
- Treatment should be limited to the lowest effective dose for the shortest duration and patients should be reviewed regularly.
History Notes
30/07/2026
Regional formulary chapter launched.
Hyperthyroid crisis
Iodine + Potassium iodide
Iodine aqueous oral solution
Prescribing Notes:
- Iodine aqueous oral solution is also known as Lugol's iodine.
History Notes
30/07/2026
Regional formulary chapter launched.