Yes, taking Thyronorm (levothyroxine) can sometimes cause a fast heart rate or palpitations, even while sleeping. This usually happens if the dosage is a bit higher than what your body currently needs, causing mild symptoms of an overactive thyroid. Please don't worry, as this is highly manageable. I gently recommend contacting your doctor so they can check your thyroid levels with a simple blood test and adjust your dose if needed.
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Can taking Thyronorm cause a fast or racing heartbeat, especially while sleeping?