At a glance
Effects
- Fat loss / thermogenesis: Raises metabolic rate and increases energy expenditure and fat oxidation, the main reason it is misused in cutting phases.[1][4]
- Bronchodilation: Relaxes airway smooth muscle, making breathing easier — its original therapeutic purpose.[1][2]
- Stimulant effects: Acts as a longer-lasting stimulant than adrenaline or albuterol, producing tremor, palpitations and a raised resting heart rate.[6][8]
- Muscle effects: Causes skeletal-muscle hypertrophy in rodents and is claimed to preserve lean mass, but human anabolic benefit is unproven.[4][5]
Beta-2 adrenergic agonist / bronchodilator
~25–39 hours
Oral (also veterinary/inhaled)
~30 min; peak ~3 h
Not FDA-approved for humans; WADA-banned anabolic agent
About Clenbuterol
Every point here is drawn from public medical and harm-reduction sources. A bracketed number after a claim — like [1]— is a reference: tap it to open the exact source it's based on (numbered list at the bottom). It is not a rating or score. Educational information, not medical advice.
Product specifics
- Est. delivery
- 3–7 business days · EU tracked
Product details as stated by the vendor (claims, not independently verified). Delivery is our standard EU estimate.
What it is
Clenbuterol is a potent, long-acting beta-2 adrenergic agonist (a sympathomimetic amine) developed as a bronchodilator for asthma and COPD in some countries outside the US.[1][2] It is not FDA-approved for human use anywhere in the United States and is widely misused off-label for fat loss and muscle preservation.[5][6]
How it works
It binds to and activates beta-2 adrenergic receptors found in airway smooth muscle, skeletal muscle and fat tissue, mimicking the action of adrenaline.[1][3] This relaxes the airways (bronchodilation) and, by raising basal metabolic rate, drives thermogenesis and fat oxidation; in humans it increases energy expenditure and fat oxidation, though its purported muscle-building effects are largely demonstrated only in animals.[1][4][5] The downstream mechanisms behind its lean-mass and fat-loss effects remain unclear.[3]
Risks & side effects
Most important: Clenbuterol's biggest danger is cardiac toxicity: even low doses can trigger severe tachycardia, dangerous drops in blood potassium (hypokalemia), arrhythmias, myocardial injury/heart attack and, rarely, cardiac arrest and death — and there is no antidote.[7][8][9] Its long half-life means toxic symptoms can build over days, and outcomes are unpredictable: identical doses can leave one person with mild tremor and another in the ER.[10][11]
Common
Serious
- Hypokalemia (low potassium), hypomagnesaemia and hyperglycaemia that can drive arrhythmias[7][8]
- Tachyarrhythmias including atrial fibrillation and ventricular tachycardia, prolonged QT[7]
- Myocardial ischaemia, myocardial infarction and myocarditis with raised troponin[7][9][12]
- Cardiac hypertrophy with chronic use[10][13]
- Toxicity at low doses requiring hospital care; symptoms can last 1–8 days[5][7]
Safety & harm reduction
- Anyone with existing cardiovascular disease, hypertension, arrhythmia or cardiac hypertrophy — clenbuterol directly stresses the heart and can cause myocardial injury.[7][10][13]
- Athletes subject to drug testing — it is prohibited by WADA at all times with no permitted threshold.[14][15]
- Anyone using it without medical supervision; it is not FDA-approved for human use and toxicity occurs even at low doses.[5][7]
- Other stimulants such as caffeine compound blood-pressure and cardiovascular strain.[8]
- Drugs or conditions that lower potassium magnify arrhythmia risk.[7]
- Beta-blockers (e.g. metoprolol) are used clinically to counteract clenbuterol's beta-agonist effect in overdose — meaning concurrent stimulant use works directly against them.[12][16]
- There is no reversal agent or antidote; overdose management is supportive — IV fluids, potassium/electrolyte repletion, benzodiazepines for agitation, and beta-blockers for tachycardia.[12][16][9]
- Because of the long half-life, toxic effects accumulate and can persist 1–8 days; do not 'top up' if effects feel weak.[5][11]
- Seek emergency care for chest pain, fainting, severe palpitations or breathing difficulty.[7][9]
Dosage context
There is no approved human dose; because clenbuterol is not FDA-approved for people, no standard dosing recommendation exists.[5] Reported athletic misuse is commonly in the 50–100 µg range or higher, and toxicity has been documented at doses as low as 20 µg, with effects over roughly 120 µg increasing tremor, headache and dizziness.[17][7][2] These are commonly-reported figures for context only — not a prescription or endorsement; the drug is dangerous and unpredictable even at low doses.[10][7]
Sources
- 1.Synapse/Patsnap – mechanism of clenbuterol hydrochloride
- 2.Anabolic Planner – Clenbuterol beta-2 agonist
- 3.DEA Drug & Chemical Info – Clenbuterol (PDF)
- 4.Jessen et al. 2020, Drug Testing and Analysis – clenbuterol energy expenditure/fat oxidation/mTOR
- 5.Poison Control – Clenbuterol: Unapproved and unsafe
- 6.ScienceDirect – Eat clen? Normalisation of clenbuterol use
- 7.PMC – Case of low dose clenbuterol toxicity
- 8.Medical News Today – Clenbuterol uses, side effects and risks
- 9.JACC – Case report of clenbuterol cardiac toxicity in a bodybuilder
- 10.Clenbuterolguide – side effects / half-life accumulation
- 11.Max Health Living – clenbuterol side effects (BP/tremor)
- 12.ScienceDirect – Case report and review of clenbuterol cardiac toxicity
- 13.PMC – Clenbuterol-Induced Myocarditis: A Case Report
- 14.WADA – The Prohibited List (clenbuterol)
- 15.WADA – Statement on clenbuterol
- 16.PMC – Low Dose Clenbuterol Toxicity: Case Report and Review
- 17.Dopeology – Clenbuterol (athletic dosing/detection)
This information is provided for educational and harm-reduction purposes only. It is not medical advice. These substances can carry serious health risks; effects and safe use vary by individual. Consult a qualified healthcare professional before use. Legal status varies by country — it is your responsibility to know your local law. We do not encourage misuse.
Other options for Clenbuterol· 11 offers
Same compound from different labs/brands and pack sizes. Tap a row to switch brand — the price and buy button update instantly.
This compound comes in different forms (e.g. injectable vs oral vs topical). Cost per mg is only comparable within the same form.
| Brand | Form | Strength | Pack | Price | Per mg |
|---|---|---|---|---|---|
Driada | blister-pack | 40 mcg/tab | 100 tab | 37,90 € | — |
Generic | — | — | 46,90 € | — | |
GenericSelected | blister-pack | 40 mcg/tab | 100 tab | 47,90 € | — |
Generic | blister-pack | 40 mcg/tab | 120 tab | 48,90 € | — |
Generic | blister-pack | 40 mcg/tab | 100 tab | 48,90 € | — |
Generic | blister-pack | 40 mcg/tab | 100 tab | 49,90 € | — |
Driada | blister-pack | 40 mcg/tab | 100 tab | 64,90 € | — |
Generic | oral-liquid | 120 mcg/ml | 50 ml | 84,90 € | — |
Intex Pharma | blister-pack | 40 mcg/tab | 100 tab | 84,90 € | — |
Generic | oral-liquid | 120 mcg/ml | 100 ml | 94,90 € | — |
Generic | blister-pack | 40 mcg/tab | 200 tab | 109,99 € | — |