Side Effects

Does levothyroxine cause weight loss or weight gain? See what studies show, what to expect after treatment, and when weight changes signal a dose problem.

See the complete list of levothyroxine side effects, what symptoms suggest your dose is too high or too low, and when to get medical help.

Side effects of levothyroxine: hair loss, palpitations, anxiety, weight changes, and more. What’s normal, what’s a red flag, and what to do.