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Cytomel – Liothyronine

Thyroid hormones, essential for our body’s metabolism, can be naturally produced or synthesized. The two primary types are T4 (levothyroxine) and T3 (liothyronine), which the thyroid gland manufactures and stores.

Pharmaceutical thyroid hormones are sourced in two ways: from animal glands (bovine or ovine) or through synthetic production. In the US, the iodine content in these preparations is strictly regulated.

Cytomel (liothyronine sodium) is offered in tablet form as a salt derived from a natural thyroid hormone, with T3 being significantly more potent than T4.

Pharmacologie

While the precise mechanisms of thyroid hormones are not fully understood, their roles induce numerous biochemical changes within cells, providing energy by increasing the metabolic utilization of carbohydrates, lipids, and proteins while boosting oxygen consumption. Users typically experience an elevated basal metabolic rate affecting nearly every organ, including the brain. The consequences of thyroid hormone deficiency highlight its critical role in well-being.

Dosage

Thyroid hormone is absorbed rapidly into the bloodstream from the stomach, initiating action within hours but peaking over several days. After administration, it can remain in the body for days due to its binding with albumin, protecting it from liver breakdown.

Indications de l'hormone thyroïdienne :

• Traitement de substitution de l'hypothyroïdie
• Ablation post-chirurgicale de la thyroïde
• Traitement des goitres et des nodules thyroïdiens
• Tests de suppression diagnostique en cas de suspicion d'hyperthyroïdie
• Alternatives for those allergic to pork or beef thyroid preparations using Cytomel

Bodybuilders and Weight Loss

For years, athletes have misused thyroid hormone for weight loss due to its ability to metabolize fats and carbohydrates. Cytomel is common among various sports, typically cycled for 4-6 weeks, ceasing just before competitive events for fat-burning and performance enhancement. While effective, the complexity arises from concurrent use of additional supplements and hormones.

Marketed online, proponents suggest starting at 25 mcg/day for weight loss, gradually increasing to a maximum of 100 mcg/day. Users often report 6-12 weeks of weight loss, although cessation can lead to thyroid insufficiency requiring gradual dose reduction for recovery. Consultation with a physician is vital for safety in off-label usage.

Signes et symptômes

Excess thyroid hormone may trigger a variety of side effects including:

• Maux de tête
• Sautes d'humeur : irritabilité, anxiété
• Transpiration
• Heart irregularities
• Palpitations
• Gêne thoracique
• Diarrhée
• Changements menstruels
• Aggravation de l'insuffisance cardiaque
• Choc

Severe overdose can resemble a thyroid storm, while chronic excess results in signs of hyperthyroidism.

Contre-indications

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

Other Considerations

Many seek thyroid hormone for weight loss, often combining it with other agents. However, the effectiveness varies, requiring higher doses that can be perilous. Care is also needed for those with adrenal insufficiency or specific conditions like diabetes.

Additionally, thyroid hormones are incorrectly touted for infertility, lacking scientific support. Individuals with cardiovascular issues must consult a physician before therapy, ideally starting with the lowest effective dose.

Niveaux

Thyroid hormone levels can easily be monitored, as all major sporting bodies, including IOC and WADA, routinely screen for their presence in athletes.

Interactions médicamenteuses

La liothyronine peut interagir avec divers médicaments, notamment :

• Anticoagulants oraux
• Insuline et hypoglycémiants oraux
• Cholestyramine
• Estrogens and oral contraceptives
• Antidépresseurs tricycliques
• Digitale

Physicians must ensure thyroid hormone dosages remain within safe limits, with close monitoring for patients.

Traitement du surdosage

In cases of suspected thyroid hormone overdose, hospital admission is necessary. Treatment typically involves ceasing hormone administration while monitoring the patient, potentially requiring a hiatus of 4-8 weeks for recovery. There are no specific antidotes; supportive care is essential, with precautions against vomiting due to aspiration risks.

Liothyronine Dosage

Liothyronine, available as a daily tablet, necessitates careful dosage based on hypothyroid severity. Initiate treatment with the lowest effective dose, typically starting at 5 mcg/day and increasing gradually. High doses or abrupt increases can exacerbate pre-existing heart conditions. Dosages between 50-75 mcg/day are common. Liothyronine is also provided in intravenous formulations for severe conditions like myxedema coma, primarily affecting elderly women. In the US, a prescription is required for l-thyronine.