UNI-PHARMA T3 30 tabs (25 mcg/tab)

Liothyronine – Cytomel

Thyroid hormones are produced naturally in the body; however, their simple molecular structure has led many pharmaceutical companies to create synthetic versions. The two primary types are T4, known as levothyroxine, and T3, known as liothyronine, both manufactured and stored in the thyroid gland.

Pharmaceutical thyroid hormones come from two sources: animal thyroid glands (bovine or ovine) or are synthetically produced. In the USA, the iodine content in thyroid preparations is rigorously controlled.

Cytomel (liothyronine sodium) is available as a tablet or in salt form from natural thyroid hormones. T3 is significantly more potent than T4.

Pharmacology

The precise mechanism by which thyroid hormones operate remains largely unknown, but they initiate numerous biochemical changes within cells and provide essential energy. They boost the use of carbohydrates, lipids, and proteins, and enhance oxygen consumption. Users often experience an increased basal metabolic rate, affecting nearly every organ, including the brain. The significance of thyroid hormones becomes apparent when observing patients with deficiencies.

Dosage

Thyroid hormone is readily absorbed from the stomach into the bloodstream, with effects beginning swiftly—typically within hours, although peak activity can take days. These hormones often remain in the system for several days, primarily due to binding with albumin, which protects them from hepatic breakdown.

Indications for thyroid hormone therapy include:

• Replacement therapy for hypothyroidism
• Post-surgical thyroid removal therapy
• Treatment for goiters and thyroid nodules
• Diagnostic use in suppression tests for hyperthyroidism assessment
• Suitable for patients allergic to pork or beef thyroid

Body Builders and Weight Loss

For years, both amateur and professional athletes have misused thyroid hormones for weight loss. As these hormones can accelerate fat and carbohydrate metabolism, many have adopted Cytomel to enhance athletic performance. Typically, thyroid hormones are taken for 4-6 weeks, ceasing a week before an event. While effective, this complex issue often overlaps with other supplements and hormones also used for performance enhancement.

Internet vendors recommend starting with 25 ug/day, gradually increasing the dosage by 5-10 ug/day over subsequent weeks. The maximum safe dose without side effects is approximately 100 ug/day. Users should be aware that discontinuation may lead to a temporary thyroid insufficiency due to gland suppression caused by prior Cytomel use. Therefore, dosage should be tapered over several weeks to months.

Consulting a healthcare provider is strongly advised for anyone considering off-label use for weight loss to ensure safety.

Signs and Symptoms

Excessive thyroid hormone usage can lead to various side effects, including:

• Headaches
• Changes in mood: irritability, nervousness, anxiety
• Excessive sweating
• Abnormal heart rhythms
• Palpitations
• Chest pain
• Diarrhea
• Menstrual irregularities
• Deterioration of heart failure
• Shock

Severe overdosage may cause thyroid storm symptoms. Chronic high doses will manifest signs of hyperthyroidism.

Contraindications

Thyroid hormone is contraindicated in individuals with untreated adrenal cortical insufficiency, untreated thyrotoxicosis, or known hypersensitivity to any component. Genuine allergic reactions to liothyronine are believed to be rare.

Signs and Symptoms

Many individuals turn to thyroid hormones for weight control, often in conjunction with other supplements. In standard patients, therapeutic doses are typically ineffective for weight loss, necessitating larger doses, which can be perilous and lead to life-threatening symptoms, exacerbated by additional agents like ephedrine.

Caution is warranted in specific medical conditions as thyroid hormones can worsen adrenal insufficiency and diabetes mellitus or insipidus. Dosage adjustments are crucial in these situations, as these hormones may heighten the body’s sensitivity to oral anticoagulants, increasing bleeding risks.

Unsubstantiated claims often arise among non-medical professionals regarding thyroid hormone’s role in treating infertility, but no scientific proof supports these assertions.

Despite their utility, thyroid hormones can induce notable side effects. Those with heart conditions or chest pain must consult a physician before commencing therapy, utilizing the lowest effective dose.

Levels

Thyroid hormone levels can be easily tested, with sporting organizations such as the IOC and WADA regularly screening athletes for these substances. Sensitive radioimmuno assays can detect minute hormone quantities in urine.

Drug Interactions

Liothyronine may interact with several medications, including:

• Oral anticoagulants
• Insulin or oral hypoglycemics
• Cholestyramine
• Estrogen, oral contraceptives
• Tricyclic antidepressants
• Digitalis

In all instances, the physician must ensure that thyroid hormone dosage remains within safe limits, with regular follow-ups advised.

Treatment of Overdosage

If thyroid hormone overdose is suspected, hospital admission is necessary. The medication should be paused, and the patient carefully monitored. Recovery typically requires halting the hormone for 4-8 weeks. There are no specific antidotes, thus supportive care is vital. Inducing vomiting is discouraged due to aspiration risks. Comatose patients may require temporary mechanical ventilation. Fluid resuscitation, oxygen, and observation are generally sufficient, though beta-adrenergic blockers may be necessary to mitigate sympathetic response.

Dosage

Liothyronine is administered orally once daily. The dosage hinges on the extent of hypothyroidism, with therapy commencing at the minimal effective dose due to its rapid action onset. The initial Cytomel (liothyronine sodium) tablet dose is 5 mcg/day, increasing by no more than 5 mcg/day every 2-3 weeks. High initial doses or abrupt increases can worsen pre-existing heart conditions. Frequently, a dose between 50-75 ug/day is adequate. Liothyronine is also available in an intravenous form and may be used for treating myxedema coma, a life-threatening manifestation of severe hypothyroidism, particularly in older women.

Liothyronine is accessible in 5, 25, and 50 ug tablets, with a doctor’s prescription required in the USA.