The common clinical side effects of Levothyroxine Sodium Tablet include arrhythmia, palpitations, angina, headache, muscle weakness and cramps, flushing, vomiting, menstrual disorders, tremor, fidgeting, insomnia, excessive sweating, weight loss and diarrhea. Side effects of taking Levothyroxine Sodium Tablet have a lot to do with overdose or exceeding the individual tolerated dose. When starting to use the drug, according to the actual condition of the patient, you can follow the doctor’s advice and start using the drug from a low dose. The drug is contraindicated in cases of hypersensitivity to the product and its excipients, untreated hypoadrenalism, pituitary insufficiency and thyrotoxicosis, acute myocardial infarction, acute myocarditis and acute total carditis. Patients taking Levothyroxine Sodium Tablets who feel unwell are advised to visit a medical institution as soon as possible.