Trade Names: T3, T4, Tertroxin, Eltroxin

Chemical Names: Liothyronine Sodium & Thyroxine Sodium

Routes: Oral

Common Thyroid-Related Products
1. Eltroxin (Thyroxine Sodium / T4)
Characteristics:
Slower onset of action
Plasma half-life of approximately 11 days
Effects may take about two weeks to become noticeable
Stable plasma levels typically reached in around four weeks
Can strongly suppress natural thyroid function
Suppressive effects may persist for 4–6 weeks after stopping
Bioavailability: Usually less than 80%

Potential Concerns:
Prolonged suppression of thyroid activity
Overdose symptoms may persist for weeks
Serious cardiovascular risks in severe overdose cases

2. Tertroxin (Liothyronine Sodium / T3)
Characteristics:
Faster onset of action
Approximate half-life of 12 hours
Acts quickly after administration
Does not typically cause prolonged suppression after discontinuation
Bioavailability: Usually exceeds 95%

Potential Advantages:
Faster clearance if discontinued
Shorter duration of overdose symptoms compared to T4

Commonly Reported Side Effects
Headache
Irritability
Nervousness
Sweating
Irregular heartbeat
Increased bowel motility
Menstrual irregularities

Important Considerations
Tapering Protocols
Gradual tapering allows the body to readjust endogenous hormone production after therapy ends.
Stimulant and Hormone Stacking
Combining thyroid hormones with stimulants such as:
Ephedrine
Clenbuterol
May increase resting heart rate and impact cardiovascular strain and exercise tolerance.
Training Recommendations
Instead of increasing intensity excessively, it is advisable to moderate training intensity and adjust duration to prevent overexertion.
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Caution
Thyroid hormones can significantly affect metabolism and cardiovascular function.Misuse or overdose can pose serious health risks.Any use should be under appropriate medical supervision.