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As with any medicine, side effects are possible with Cytomel (liothyronine sodium). However, not everyone who takes the medication will experience side effects. In fact, most people tolerate it quite well. If Cytomel side effects do occur, in most cases, they are minor and either require no treatment or can easily be treated by you or your healthcare provider.
Cytomel side effects typically occur when the dose is too high. Too much thyroid hormone causes symptoms of an overactive thyroid (hyperthyroidism). Some of these symptoms can be quite dangerous, and any of these symptoms should be reported to your healthcare provider, as they may signal that your Cytomel dosage needs to be adjusted.
These side effects include: high blood pressure (hypertension), a rapid heart rate (tachycardia), an irregular heart rhythm (arrhythmia), heart failure, chest pain, or a heart attack, heart palpitations, an increased appetite, along with weight loss, feeling hot all the time and increased sweating, fever, hyperactivity, nervousness, anxiety, or irritability, insomnia, emotional changes, shakiness or muscle weakness, difficult or painful breathing, diarrhea, vomiting, or abdominal cramps (stomach cramps), hair loss, flushing, broken bones or other signs of weakened bones, difficulty breathing, especially if accompanied by fluid retention in the legs or feet (signs of congestive heart failure or CHF), menstrual problems or fertility problems, seizures.
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