Clenbuterol: Scientific Profile
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Selective β2-adrenergic receptor agonist for research. Used in preclinical models to analyze thermogenesis, weight reduction and modulation of protein synthesis.
Clenbuterol is a sympathomimetic amine with high affinity for β2-adrenergic receptors, chemically classified as a phenylethanolamine. In research settings, its main application lies in its ability to stimulate the sympathetic nervous system, which results in a significant increase in the basal metabolic rate through the activation of the intracellular cyclic adenosine monophosphate (cAMP) signaling cascade.
Studies document that this compound facilitates lipolysis through the stimulation of hormone-sensitive lipase (HSL), enabling the mobilization of fatty acids from white adipose tissue for subsequent oxidation. Unlike other non-selective adrenergic agonists, Clenbuterol shows a prolonged half-life, which makes it a model of interest for evaluating the kinetics of weight reduction and energy expenditure.
Additionally, its potential anabolic or nitrogen-sparing effect has been investigated in animal models of muscle atrophy. It is postulated that β2 activation may influence the modulation of protein synthesis pathways and the inhibition of proteasomal protein degradation, although these effects require further validation in controlled body-composition contexts.
Mechanism of action
It acts as an agonist of the β2 adrenergic receptors located on the cell membranes. Its binding activates the enzyme adenylate cyclase, increasing intracellular cAMP levels. This process activates protein kinase A (PKA), which phosphorylates hormone-sensitive lipase, triggering the breakdown of triglycerides into glycerol and free fatty acids. Simultaneously, it stimulates thermogenesis in adipose and muscle tissue through mitochondrial uncoupling.
Mechanism summary
A selective β2 agonist that increases intracellular cAMP to activate lipolysis and raise thermogenesis through the sympathetic nervous system.
Clinical Studies (7)
- Adverse events of clenbuterol among athletes: a systematic review of case reports and case series (Kumari S et al. · International journal of legal medicine · 2023) PMID 37062796.
- Clenbuterol Hydrochloride (Al-Majed AA et al. · Profiles of drug substances, excipients, and related methodology · 2017) PMID 28431781.
- Clenbuterol and the horse revisited (Kearns CF et al. · Veterinary journal (London, England: 1997) · 2009) PMID 18926742.
- Clenbuterol: a substitute for anabolic steroids? (Prather, et al. · Medicine & Science in Sports & Exercise · 1995) PMID 7476054.
- Anabolic effects of clenbuterol on skeletal muscle are mediated by beta 2-adrenoceptor activation (Choo, et al. · American Journal of Physiology · 1992) PMID 1322047.
- Clenbuterol, a beta-adrenoceptor agonist, increases relative muscle strength in orthopaedic patients (Maltin, et al. · Clinical Science (London) · 1993) PMID 8334811.
- Randomized, Double-Blind, and Placebo-Controlled Trial of Clenbuterol in Denervated Muscle Atrophy (Jiang, et al. · ISRN Pharmaceutics · 2011)
Warnings
Clenbuterol is a research-use-only (RUO) compound; the following warnings and handling considerations apply to its laboratory use:
- Requires constant monitoring of heart rate in study subjects
- Risk of receptor desensitization (downregulation) after continuous use
- Potent thermogenic substance: requires precise dose adjustment to avoid toxicity
- Pre-existing cardiovascular insufficiency
- Uncontrolled hyperthyroidism
- Closed-angle glaucoma
- Models with documented arrhythmias
Technical data
- CAS
- 37148-27-9
- Molecular formula
- C12H18Cl2N2O
- Molecular weight
- 277.19 Da
- Compound type
- sarm
- Storage
- 15-25°C dry
- Shelf life (lyophilized)
- 36 months
- Shelf life (reconstituted)
- Not applicable (Tablets)
- Light-sensitive
- No
Available for research
Clenbuterol is available as a research reagent (RUO):
Frequently asked questions about Clenbuterol
What is Clenbuterol?
Selective β2-adrenergic receptor agonist for research. Used in preclinical models to analyze thermogenesis, weight reduction and modulation of protein synthesis.
What is the mechanism of action of Clenbuterol?
A selective β2 agonist that increases intracellular cAMP to activate lipolysis and raise thermogenesis through the sympathetic nervous system.
What is Clenbuterol researched for?
In preclinical research, Clenbuterol is studied mainly in: Research on the modulation of basal metabolic rate; Study of β2-receptor-mediated lipolysis; Evaluation of weight reduction in obesity models. Material exclusively for scientific research.
What are the chemical properties of Clenbuterol?
Molecular formula C12H18Cl2N2O; molecular weight 277.19 Da; CAS number 37148-27-9.
How is Clenbuterol stored?
Storage conditions: 15-25°C dry; lyophilized stability: 36 months; once reconstituted: Not applicable (Tablets).
What routes of administration are studied for Clenbuterol?
In research models the following are described: Oral. Use is exclusively for scientific research.