Levothyroxine sodium

Levothyroxine sodium – synthetic thyroid hormone. He is the L-isomer of a natural tetraiodothyronine (T4). Thyroid hormones speed up the metabolism, and therefore they are used for medicinal purposes to fight thyroid insufficiency, obesity, metabolic disorders, and fatigue. Also, levothyroxine is used when the patient’s thyroid gland does not produce the desired level of thyroid hormones. Hypothyroidism is detected by analysis on hormones (T3, T4 and TSH), and has features as sleepiness, weight gain, loss of hair, and changes in skin texture. T3 is more active in the human body and it is stronger than the preparations of levothyroxine (T4).

Action levothyroxine very similar to the effect of liothyronine. Liothyronine is different in structure, making it 4 times stronger substance in equal amounts.

Bodybuilders have resorted to the drug when it is necessary to burn excess fat. It is most commonly used in the preparation of precompetitive, since his admission can not monitor the amount of calories consumed. It is often used in conjunction with sympathomimetic and growth hormone. Some use them to “course” to strengthen the anabolic effect of anabolic steroids. In theory, they can increase the utilization of protein and carbohydrates in the process of muscle growth.


Levothyroxine was the first synthetic thyroid substance, which fell to the US market in 1955.

Product form:

Levothyroxine sodium is usually produced in the form of tablets 25mkg, 50mkg, 75mkg, 100mcg, 125mkg, and 150mkg 200mkg.

Structural features:

Levothyroxine sodium – a synthetic form of the hormone T4. Its chemical formula is 3,5,3 ‘, 5′-tetrayodo-L-thyronine.


FDAtrebuet print on preparations levothyroxine sodium warning that its misuse can lead to life-threatening consequences.

Side effects:

Side effects associated with overdose and include headache, irritability, sweating, irregular heartbeat, increased bowel motility, and menstrual irregularities. Overdosing may cause shock or provoke angina. Chronic overdose has symptoms of hyperthyroidism. Acute severe overdose can be life-threatening.


Most bodybuilders to burn fat is enough to start with 25-100mkg doses per day. This dose may be increased every 1-2 days in steps of 25-50mg, but it should not exceed 400mkg day. The faster the increase in the dose – the more likely side effects. This drug should not be taken for more than 6 consecutive weeks and throwing his reception once it is impossible – it is necessary to reduce the dose gradually by 25mkg every 1-2 days.

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