Answer
Specialist review is required promptly. Liothyronine is generally not preferred because the fetus requires an adequate maternal T4 supply, but thyroid treatment should not be stopped without advice.
Sources for this answer
- Liothyronine Sodium 15 Microgram Tablets — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.