Along with its needed effects, levothyroxine may cause some unwanted
effects. Although not all of these side effects may occur, if they do
occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking levothyroxine:
Less common
Check with your doctor immediately if any of the following side effects occur while taking levothyroxine:
Less common
- Chest pain or discomfort
- decreased urine output
- difficult or labored breathing
- difficulty with swallowing
- dilated neck veins
- extreme fatigue
- fainting
- fast, slow, irregular, pounding, or racing heartbeat or pulse
- fever
- heat intolerance
- hives or welts
- increased blood pressure
- increased pulse
- irregular breathing
- irritability
- menstrual changes
- nausea
- pain or discomfort in the arms, jaw, back, or neck
- shortness of breath
- skin itching, rash, or redness
- sweating
- swelling of the eyes, face, lips, throat, or tongue
- tightness in the chest
- tremors
- troubled breathing
