Common side effects of Eugenol, or levothyroxine sodium tablets, if taken in excess over a long period of time, include hyperthyroidism and angina pectoris. If you take the right amount of the drug for a long period of time as prescribed by your doctor, there are usually no side effects. Levothyroxine Sodium Tablet is a thyroid hormone drug. According to authoritative information, if long-term overdose of levothyroxine sodium tablets, when more than the individual’s tolerated dose, then it will cause hyperthyroidism, the patient may appear tachycardia, palpitations, headache, insomnia, excessive sweating, weight loss and other symptoms, generally reduce the dosage or discontinue the drug, the uncomfortable symptoms can gradually disappear. Besides, long-term overdose of this drug may cause angina pectoris or myocardial infarction, especially in the elderly and patients with heart disease. However, in general, there are usually no side effects when the right amount of Levothyroxine Sodium Tablet is taken on time as prescribed by the doctor for a long period of time. All in all, patients must take levothyroxine sodium tablets under the guidance of a doctor, do not self-medication, so as not to affect the therapeutic effect of the drug and delay the condition.