Thyrotoxicosis

1) Anti-thyroid drugs cross the placenta and over-treatment may result in fetal hypothyroidism and goitre

2) No place for "block-and replace" regimens

3) Diagnostic radio-iodine scans contra-indicated in pregnancy but may be undertaken if breast-feeding 
- stop breast-feeding for 24h. 
- Avoid pregnancy for at least 4 months after radio-iodine treatment