What it is

Not a steroid. A beta-2 agonist originally developed as a bronchodilator for asthma treatment. Used in the fitness community as a fat burner and mild anti-catabolic agent. Available in tablet form. Not approved for human use in the UK.

What it does

Increases metabolic rate, promotes fat loss, and has mild anti-catabolic effects. Causes a rise in body temperature and heart rate. Stimulates the central nervous system. Effects on fat loss are modest and temporary.

Typical dosages

Users typically start at 20mcg per day and ramp up gradually to 80-120mcg per day over 2 weeks, then cycle off. Various protocols exist (2 weeks on/2 weeks off, or continuous with ketotifen). The margin between an effective dose and a dangerous dose is narrow. This is not a recommendation; it is what is commonly reported.

These figures reflect commonly reported usage in harm reduction communities. They are not recommendations. There is no safe dose of anabolic steroids for non-medical use. Start low and monitor your health through blood work.

Side effects

Cardiac arrhythmias and tachycardia (rapid heart rate)
Tremors (particularly in the hands)
Insomnia
Muscle cramps (due to taurine depletion)
Headaches
Excessive sweating
Anxiety and nervousness
Elevated blood pressure

Specific risks

Cardiac: multiple deaths have been associated with Clenbuterol overdose. The compound directly stimulates the heart and can cause dangerous arrhythmias, particularly in individuals with undiagnosed cardiac conditions
Narrow therapeutic window: the difference between an effective dose and a harmful dose is small. Dosage escalation protocols increase risk over time
Electrolyte depletion: Clenbuterol depletes taurine and potassium, which can contribute to muscle cramps and cardiac issues. Supplementation is commonly recommended but does not eliminate the risk
Drug interactions: should not be used alongside other stimulants (caffeine at high doses, ephedrine, DMAA). The combined cardiac stimulation can be dangerous

What to watch for

Resting heart rate above 100bpm (tachycardia)
Irregular heartbeat or palpitations (stop immediately and seek medical attention)
Severe muscle cramps that do not resolve with supplementation
Chest pain or tightness
Inability to sleep (insomnia can become severe)
Do not use if you have any existing heart condition

Other compounds

Testosterone

Lower/Moderate Risk

The base of almost every steroid cycle. Testosterone is the primary male sex hormone and the most commonly used anabolic steroid.

Trenbolone

Extreme Risk

One of the most powerful and dangerous steroids in common use. Extremely potent but with a severe side effect profile that makes it unsuitable for most users.

Anavar (Oxandrolone)