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Beta-2 agonist / stimulant-like drug
clen
Clenbuterol is used nonmedically as a stimulant-like fat-loss drug, not for a fuller muscle look. Shaking and a racing heart can be more obvious than any change in body fat. A recent small human trial did not find fat loss and found worse aerobic fitness. Heart injury and dangerous potassium changes are major concerns.
A short human trial reported lean-mass/protein effects but reduced cardiorespiratory fitness and muscle oxidative capacity. Type-I-to-II fiber switching is mainly animal evidence, not a settled human claim.
Tachycardia, arrhythmia, tremor, anxiety, electrolyte disturbance, myocardial injury and reduced exercise capacity.
Heart rate/rhythm; blood pressure; potassium and glucose when clinically indicated; chest pain or dyspnea require urgent assessment.
Used medically in some countries and in veterinary contexts; not FDA-approved for human use in the United States or for fat loss.
Lean-mass/protein effects accompanied by reduced cardiorespiratory fitness and oxidative capacity.
Two-week study; long-term risk unknown.
Original source ↗Reported fiber-type changes.
Animal evidence; cannot be stated as proven in humans.
Original source ↗Summarized serious cardiovascular toxicity.
Reports are subject to selection bias.
Original source ↗