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Levothyroxine Can Cause Side Effects – T4 Medication
In addition to its needed effects, some unwanted effects may be caused by levothyroxine. In the event that any of these side effects do occur, they may require medical attention.
Severity: Major
You should check with your doctor immediately if any of these side effects occur when 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
Rare
- Blurred or double vision
- dizziness
- eye pain
- lack or slowing of normal growth in children
- limp or walk favoring one leg
- pain in the hip or knee
- seizures
- severe headache
If any of the following symptoms of overdose occur while taking levothyroxine, get emergency help immediately:
Symptoms of overdose
- Change in consciousness
- cold, clammy skin
- confusion
- disorientation
- fast or weak pulse
- lightheadedness
- loss of consciousness
- sudden headache
- sudden loss of coordination
- sudden slurring of speech
Severity: Minor
Some of the side effects that can occur with levothyroxine may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:
Less common
- Abdominal or stomach cramps
- change in appetite
- crying
- diarrhea
- false or unusual sense of well-being
- fear
- feeling not well or unhappy
- feeling of discomfort
- feeling of warmth
- feeling things are not real
- feelings of suspicion and distrust
- hair loss
- headache
- increased appetite
- mental depression
- muscle weakness
- nervousness
- quick to react or overreact emotionally
- rapidly changing moods
- redness of the face, neck, arms, and occasionally, upper chest
- restlessness
- trouble getting pregnant
- trouble sitting still
- unusual tiredness or weakness
- vomiting
- weight gain
- weight loss
Not all side effects for levothyroxine may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
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