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What are the efficacy and functions of Euthyrox?

Jul 14, 2025 Source: Cainiu Health
Dr. Yang Chuanjia
Introduction
Levothyroxine sodium tablets, also known as Euthyrox, are a type of thyroid hormone medication. Generally, levothyroxine sodium tablets function to supplement thyroid hormones, treat hypothyroidism, suppress goiter, assist in the treatment of thyroid cancer, and regulate metabolism. It is important to follow medical instructions strictly when using this medication and to monitor thyroid function regularly.

Levothyroxine sodium tablets, commonly known as Euthyrox, are a type of thyroid hormone medication. Generally speaking, levothyroxine sodium tablets function primarily by supplementing thyroid hormones, treating hypothyroidism, inhibiting goiter, assisting in the treatment of thyroid cancer, and regulating metabolism. The specific functions are as follows:

1. Supplementing thyroid hormones: The main component of levothyroxine sodium tablets is chemically similar to the thyroid hormone secreted by the human thyroid gland. It can compensate for insufficient thyroid hormone in the body and is suitable for conditions where thyroid hormone secretion is reduced. By supplementing thyroid hormones, it helps maintain normal hormone levels in the body to meet physiological needs.

2. Treating hypothyroidism: Hypothyroidism is a condition caused by insufficient thyroid hormones. Levothyroxine sodium tablets can effectively treat this condition, alleviating symptoms caused by hormone deficiency such as fatigue, intolerance to cold, weight gain, and slowed heart rate. By supplementing hormones, it improves the body's metabolism and functions of various systems.

3. Inhibiting goiter: Levothyroxine sodium tablets can suppress the secretion of pituitary thyroid-stimulating hormone (TSH), thereby inhibiting the proliferation of thyroid tissue. It is suitable for the treatment and prevention of simple goiter. It can reduce the degree of thyroid enlargement and prevent further progression of goiter.

4. Assisting in the treatment of thyroid cancer: After thyroid cancer surgery, levothyroxine sodium tablets can be used as an adjunctive treatment. By suppressing the secretion of thyroid-stimulating hormone, it reduces the risk of thyroid cancer recurrence. It helps maintain stable thyroid hormone levels post-surgery and supports consolidation of treatment effects.

5. Regulating metabolism: Thyroid hormones play an important role in regulating the body's metabolism. Levothyroxine sodium tablets regulate the body's material and energy metabolism by supplementing thyroid hormones, improving symptoms caused by slow metabolism such as dry skin, constipation, and mental lethargy.

During use, it is also important to follow medical instructions strictly, regularly monitor thyroid function, and adjust the dosage according to test results to ensure the safety and effectiveness of the medication.

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Does Hashimoto's hypothyroidism require lifelong levothyroxine (Euthyrox) treatment?
Hashimoto's hypothyroidism, also known as Hashimoto's thyroiditis with hypothyroidism, is typically treated with Euthyrox (levothyroxine sodium tablets). In most cases, lifelong administration of levothyroxine sodium is required. However, in a minority of patients where hypothyroidism is caused by temporary thyroid damage, medication may be discontinued once thyroid function has recovered. If you have any concerns, it is recommended to consult a healthcare professional in advance.
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Dr. Yang Chuanjia
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What should not be eaten for breakfast after taking Euthyrox
Milk contains a high amount of calcium, which can combine with medications to form complexes that are difficult to absorb, reducing the bioavailability of levothyroxine sodium tablets and affecting drug efficacy. There should be at least a one-hour interval between consuming milk and the medication. Soy milk, rich in plant protein and calcium, can interfere with intestinal absorption of the medication when taken together, leading to insufficient drug concentration in the blood and ineffective regulation of thyroid function.
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Dr. Shen Yonghua
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What is Euthyrox used for?
Euthyrox is levothyroxine sodium tablets. Levothyroxine sodium tablets are generally used for the treatment of hypothyroidism, postoperative suppression therapy for thyroid cancer, prevention of recurrence after thyroidectomy for goiter, nontoxic goiter, and as adjunctive therapy for hyperthyroidism during antithyroid drug treatment. If any abnormalities occur, prompt medical attention is recommended.
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Dr. Yang Chuanjia
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Can pregnant women take Euthyrox?
In general, Euthyrox usually refers to levothyroxine sodium tablets. Whether pregnant women can take it depends on their thyroid function status and the professional guidance of a physician. Pregnant women must strictly follow the dosage and schedule recommended by their doctor when taking levothyroxine sodium tablets and should not adjust the dosage on their own. The demand for thyroid hormones typically increases during pregnancy.
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Dr. Zhang Lu
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Can I take Euthyrox during pregnancy?
Levothyroxine sodium tablets, also known as Euthyrox, can generally be taken during pregnancy. However, the dosage must be strictly controlled according to medical advice, and thyroid function should be regularly monitored. During pregnancy, due to increased demand for thyroid hormones, patients with existing hypothyroidism or pregnant women newly diagnosed with hypothyroidism need to maintain normal thyroid function through medication to avoid adverse effects on fetal development.
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Dr. Zhang Lu
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Can I get pregnant while taking Euthyrox?
In general, Euthyrox usually refers to levothyroxine sodium tablets. Whether one can become pregnant while taking levothyroxine sodium primarily depends on the individual's overall health status and thyroid function. To avoid unnecessary risks to both the mother and the fetus, it is recommended to use Euthyrox under the guidance of a specialist in endocrinology or obstetrics and gynecology, and to undergo regular thyroid function tests.
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Dr. Yang Chuanjia
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How long after taking Euthyrox can I drink milk?
Euthyrox usually refers to levothyroxine sodium tablets. Under normal circumstances, milk can be consumed 2-4 hours after taking levothyroxine sodium tablets. This should be determined based on the drug's absorption. For proper use of levothyroxine sodium tablets and dietary considerations, it is best to consult a healthcare professional for personalized guidance. Maintain healthy lifestyle habits during the treatment period.
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Dr. Yang Chuanjia
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Is Levothyroxine used to treat hypothyroidism or hyperthyroidism?
Hypothyroidism is caused by insufficient secretion of thyroid hormones. Sodium levothyroxine tablets can supplement the required thyroid hormones in the body and maintain normal metabolism. After administration, symptoms such as fatigue caused by slowed metabolism can be improved, allowing thyroid function to gradually return to normal. Hyperthyroidism is caused by excessive secretion of thyroid hormones; treatment requires inhibiting hormone synthesis or reducing its secretion.
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Dr. Yang Chuanjia
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