What are Synthroid side effects?
More common side effects of Synthroid include minor hair loss. Some side effects which are more serious can include irritability; changes in weight; headaches; insomnia; changes in appetite; fever; changes in menstrual periods and hot flashes. Contact your doctor if you have any incidence off these more serious side effects. If you notice any signs of an allergic reaction such as rash or hives; trouble breathing or swollen tongue, throat, mouth or face you should seek medical advice straight away.