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T3 Cytomel LA 100 ug , (Liothyronine Sodium) by LA Pharma

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Liothyronine Sodium
20.00 Grams
100 tabs. / pack (100 ug)
Calculated at checkout
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Product Description



Liothyronine is a form of thyroid hormone used to treat hypothyroidism and myxedema coma. It is marketed as the sodium salt under the brand name Cytomel (or Tertroxin in Australia).



  • 1 Pharmacology
  • 2 Side effects
  • 3 Black box warning
  • 4 Uses
  • References
  • External links


    Liothyronine is the most potent form of thyroid hormone. As such, it acts on the body to increase the basal metabolic rate, effect protein synthesis and increase the body's sensitivity to catecholamines (such as adrenaline) by permissiveness. The thyroid hormones are essential to proper development and differentiation of all cells of the human body. These hormones also regulate protein, fat, and carbohydrate metabolism, affecting how human cells use energetic compounds.

    In comparison to levothyroxine (T4), liothyronine has a faster onset of action as well as a shorter biological half-life, which may be due to less plasma protein binding to thyroxine-binding globulin and transthyretin.


    Side effects

    Liothyronine may cause a number of side effects, mostly similar to symptoms of hyperthyroidism, which include:

    • weight loss
    • tremor
    • headache
    • upset stomach
    • vomiting
    • diarrhea
    • stomach cramps
    • nervousness
    • irritability
    • insomnia
    • excessive sweating
    • increased appetite
    • fever
    • changes in menstrual cycle
    • sensitivity to heat


    Black box warning

    The package insert for Cytomel contains the following black box warning:

    Drugs with thyroid hormone activity, alone or together with other therapeutic agents, have been used for the treatment of obesity. In euthyroid patients, doses within the range of daily hormonal requirements are ineffective for weight reduction. Larger doses may produce serious or even life-threatening manifestations of toxicity, particularly when given in association withsympathomimetic amines such as those used for their anorectic effects.



    Physicians can use this instead of levothyroxine (T4) for patients undergoing thyroid withdrawal. When a patient has thyroid cancer or Grave's, I-131 ablation therapy can be used to remove any trace thyroid tissue. In order for I-131 therapy to be effective, the trace thyroid tissue must be avid to iodine. The best method is to starve the tissue of iodine but this can lead to hypothyroid symptoms for the patient. Withdrawal from levothyroxine can be done but it takes 6 weeks of withdrawal for the remaining thyroid tissue to be completely starved. 6 weeks is needed owing to levothyroxine's long half life. 6 weeks can be inconvenient for the patient and delay treatment. Liothyronine instead can be taken and withdrawn from for 2 weeks to starve the thyroid tissue. This is much safer and more convenient than levothyroxine.



    1. ^ MedlinePlus. "Liothyronine." Last accessed July 14, 2007.
    2. ^ United States Food & Drug Administration. "Cytomel." Last accessed July 14, 2007.

    External links

    • Liothyronine bound to proteins in the PDB


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