If your friend is taking levothyroxine for hypothyroidism, it is generally not necessary to stop it before a minor oral surgical procedure. In fact, the usual recommendation is to continue the medication, even on the day of surgery, unless the treating surgeon or anesthetist has a specific reason to advise otherwise.
Next Steps
If she is asked to skip just one dose, it is unlikely to cause any significant side effects because levothyroxine has a long half-life (about 7 days). She should simply resume her regular dose the next day. There is no need to change the dose or brand.
Health Tips
It would be helpful to clarify which medication she was advised to stop, as sometimes instructions are meant for other medicines rather than
thyroid tablets.