Magnus Pharmaceuticals T-3 50 tabs (25 mcg/tab)

Liothyronine – Cytomel

Thyroid hormones are naturally produced in our body, yet many pharmaceutical companies offer synthetic alternatives due to their simplicity. The two primary forms are T4, known as levothyroxine, and T3, recognized as liothyronine, both synthesized and stored in the thyroid gland.

Thyroid hormones are created in two ways: derived from animal thyroid glands (bovine or ovine sources) or produced synthetically. In the USA, the iodine content and quantity in thyroid preparations are strictly regulated.

Cytomel (liothyronine sodium) is available as both a tablet and the salt form of a naturally occurring thyroid hormone. T3 is significantly more potent than T4.

Pharmacology

While the exact mechanisms of how thyroid hormones operate remain unclear, they initiate numerous biochemical changes at the cellular level. Primarily, they provide energy, boost the metabolism of carbohydrates, fats, and proteins, while enhancing oxygen consumption. Patients taking thyroid hormones often experience an elevated basal metabolic rate, impacting nearly all bodily organs, including the brain. The significance of thyroid hormones is particularly evident in patients showing deficiency.

Dosage

Thyroid hormones are efficiently absorbed by the body, with onset typically occurring within hours, though peak activity may take days. The hormone remains in the body for several days due to its binding to albumin in the bloodstream, protecting it from liver breakdown.

Indications for thyroid hormone include:

• Hypothyroidism replacement therapy
• Post-surgical thyroid removal replacement therapy
• Treatment for goiters and thyroid nodules
• Diagnostic agents in suppression tests for hyperthyroidism distinction
• Alternative for those allergic to pork or beef thyroids

Bodybuilders and Weight Loss

For years, both amateur and professional athletes have misused thyroid hormones for weight loss due to their ability to burn fats and carbohydrates. Cytomel is popular across various sports disciplines, typically taken for 4-6 weeks and halted a week before events. While Cytomel is a proven fat burner that boosts exercise performance, its use often coincides with a mix of other supplements.

Online sellers recommend starting with 25 mcg/day for a few weeks, increasing by 5-10 mcg/day thereafter, capping at 100 mcg/day to avoid side effects. Athletes report weight loss successes within 6-12 weeks; however, discontinuing can lead to thyroid insufficiency due to gland suppression. Thus, gradual tapering of the dosage is crucial.

Consultation with a physician prior to off-label use, particularly for weight loss, is strongly advised for safety.

Signs and Symptoms

Excess thyroid hormone usage can lead to:

• Headaches
• Mood swings: irritability, anxiety
• Increased sweating
• Irregular heart rhythms
• Palpitations
• Chest pain
• Diarrhea
• Menstrual irregularities
• Heart failure exacerbation
• Shock

Severe overdose may mimic thyroid storm, with chronic excessive intake causing hyperthyroidism symptoms.

Contraindications

Thyroid hormone is contraindicated for those with untreated adrenal cortical insufficiency, thyrotoxicosis, or hypersensitivity to its components. True allergic reactions to liothyronine are rare.

Weight Loss Considerations

Individuals often combine thyroid hormones with other supplements for weight loss. Normal therapeutic doses are generally ineffective as weight loss aids; larger doses are required and can be dangerous, exacerbated by additional supplements like ephedrine or growth hormones. Caution is advised in patients with adrenal insufficiency, diabetes mellitus, and during concurrent anticoagulant therapy, as thyroid hormones increase bleeding risks.

No scientific evidence supports non-medical claims of thyroid hormone efficacy in treating infertility. Given their potential for serious side effects, individuals with heart issues should consult a physician prior to therapy, ideally starting with the lowest effective dose.

Levels of Thyroid Hormone

Thyroid hormone levels can easily be checked; sporting agencies routinely screen athletes using sensitive radioimmunoassays to detect minimal hormone quantities in urine.

Drug Interactions

Liothyronine may interact with:

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

Physicians must ensure thyroid hormone dosage remains safe and patients should undergo regular monitoring.

Overdosage Treatment

In suspected thyroid hormone overdosage, hospitalization is necessary. The hormone should be halted, patients observed, and typically rested for 4-8 weeks for recovery. Supportive care is essential in the absence of specific antidotes; inducing vomiting is inadvisable due to aspiration risks. Patients may require mechanical ventilation in critical cases, with most managed effectively through fluid resuscitation and observation, occasionally necessitating beta-adrenergic blockers to mitigate sympathetic overactivity.

Dosage Recommendations

Liothyronine tablets are for daily use, with dosages tailored to the severity of hypothyroidism. Therapy must start with the lowest feasible dose due to the rapid onset of action. Initial dosing for Cytomel tablets is 5 mcg/day, adjusted by no more than 5 mcg/day every 2-3 weeks. High starting doses or sudden increases can worsen preexisting cardiac conditions. Typically, effective doses range between 50-75 mcg/day. Liothyronine is also available intravenously for severe scenarios like myxedema coma — a critical condition predominantly affecting elderly females.

Liothyronine comes in 5, 25, and 50 mcg tablets, requiring a doctor’s prescription in the USA.