Side Effects

Eltroxin 100 Side Effects

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Side Effects

Eltroxin 100 (levothyroxine sodium) can cause a range of side effects, some common and mild, others rare but serious. It is important to monitor for side effects and discuss any concerns with your doctor.

Common side effects may include:

  • Headache
  • Nausea or feeling sick
  • Vomiting
  • Diarrhea
  • Increased sweating or flushing
  • Hair loss (usually temporary in children during the first month)
  • Weight changes
  • Appetite changes
  • Fatigue or restlessness
  • Trouble sleeping
  • Muscle weakness or cramps
  • Tremor (shaking, usually hands)
  • Menstrual changes
  • Nervousness or irritability
  • Sensitivity to heat

If these effects are severe or persistent, contact your healthcare provider.[3][6][5]

Less common but potentially serious side effects may include:

  • Chest pain, discomfort, or tightness
  • Palpitations (fast, pounding, irregular heartbeat)
  • Shortness of breath or difficulty breathing
  • Extreme fatigue or fainting
  • Swelling of face, eyes, lips, throat, or tongue
  • Irritability or agitation
  • Severe headache
  • Blurred or double vision
  • Seizures
  • Reduced final height in children (rare, with long-term overdosage)
  • Weak bones (osteopenia or osteoporosis with long-term excessive dosing)

Seek immediate medical attention if any of these symptoms occur.[1][2][4]

Allergic reactions are rare but can be life-threatening:

  • Rash, hives, or itching
  • Sudden swelling of lips, mouth, tongue, or throat
  • Breathing difficulty or wheezing
  • Severe dizziness or fainting

These can be signs of a serious allergic reaction (anaphylaxis) and require emergency medical care.[2][5]

Symptoms of overdose may include:

  • Change in consciousness or confusion
  • Cold, clammy skin
  • Fast or weak pulse
  • Sudden loss of coordination or slurred speech
  • Loss of consciousness
  • Seizures

Overdose can be dangerous; contact emergency services if these occur.[1][4]

Most people tolerate Eltroxin well when the dose is correctly managed. Not all possible side effects are listed here; contact your doctor if you notice any new or concerning symptoms.[6][3]

References

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