Thyronorm contains levothyroxine, a thyroid hormone replacement. Sometimes, if the dose is slightly higher than your body needs, it can mimic an overactive thyroid, leading to a fast or fluttering heart rate. Please contact your doctor soon. They will likely order a simple blood test to check your thyroid levels and adjust your levothyroxine dose if needed. Do not stop your medication without speaking to them first.
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Can taking Thyronorm (50 mg) for an underactive thyroid cause a racing or fluttering heartbeat?