Title: Clenbuterol
CAS Registry Number: 37148-27-9
CAS Name: 4-Amino-3,5-dichloro-a-[[(1,1-dimethylethyl)amino]methyl]benzenemethanol
Additional Names: 4-amino-a-[(tert-butylamino)methyl]-3,5-dichlorobenzyl alcohol
Manufacturers' Codes: NAB-365
Trademarks: Monores (Valeas)
Molecular Formula: C12H18Cl2N2O
Molecular Weight: 277.19
Percent Composition: C 52.00%, H 6.55%, Cl 25.58%, N 10.11%, O 5.77%
Literature References: Substituted phenylethanolamine with b2 sympathomimetic activity. Prepn: J. Keck et al., ZA 6705692; eidem, US 3536712 (1968, 1970 both to Thomae); eidem, Arzneim.-Forsch. 22, 861 (1972). Series of articles on pharmacology, reproductive toxicology, pharmacokinetics and metabolism: ibid. 26, 1403-1419, 1427-1460 (1976). Toxicity: M. Ueberberg et al., ibid. 1420. Clinical studies: M. Tschan et al., Eur. J. Clin. Pharmacol. 15, 159 (1979); C. Pasotti et al., Int. J. Clin. Pharmacol. Biopharm. 17, 176 (1979). Effect on weight gain in lambs: M. E. Nichols et al., 1991 Animal Science Research Report (Oklahoma Agric. Exp. Station, Oklahoma State University, 1991) 303.
Derivative Type: Hydrochloride
CAS Registry Number: 21898-19-1
Manufacturers' Codes: NAB-365Cl
Trademarks: Spiropent (Thomae; Boehringer, Ing.); Ventipulmin (Boehringer, Ing.)
Molecular Formula: C12H18Cl2N2O.HCl
Molecular Weight: 313.65
Percent Composition: C 45.95%, H 6.11%, Cl 33.91%, N 8.93%, O 5.10%
Properties: Colorless microcrystalline powder from isopropyl alc, mp 174-175.5°. Very sol in water, methanol, ethanol, slightly sol in chloroform. Insol in benzene. LD50 in mice, rats, guinea pigs (mg/kg): 176, 315, 67.1 orally; 27.6, 35.3, 12.6 i.v. (Ueberberg).
Melting point: mp 174-175.5°
Toxicity data: LD50 in mice, rats, guinea pigs (mg/kg): 176, 315, 67.1 orally; 27.6, 35.3, 12.6 i.v. (Ueberberg)
Therap-Cat: Bronchodilator.
Therap-Cat-Vet: Bronchodilator; tocolytic.
Keywords: ?Adrenergic Agonist; Bronchodilator; Ephedrine Derivatives.
Clentiazem Clethodim Clevidipine Clidanac Clidinium Bromide

Systematic (IUPAC) name
Clinical data
AHFS/ International Drug Names
Pregnancy cat. C
Legal status POM (UK) -only (US)
Routes oral
Pharmacokinetic data
Bioavailability 89-98% orally
Metabolism sympathetic nervous system
Half-life 36-48 hours
Excretion feces and urine
CAS number 37148-27-9 YesY
ATC code R03AC14 R03CC13 QG02CA91
PubChem CID 2783
DrugBank DB01407
ChemSpider 2681 YesY
KEGG D07713 YesY
ChEBI CHEBI:174690 YesY
Chemical data
Formula C12H18Cl2N2O 
Mol. mass 277.19
 YesY (what is this?)  (verify)

Clenbuterol, marketed as Spiropent, Ventipulmin, and also generically as clenbuterol, is a sympathomimetic amine used by sufferers of breathing disorders as a decongestant and bronchodilator. People with chronic breathing disorders such as asthma use this as a bronchodilator to make breathing easier. It is most commonly available as the hydrochloride salt, clenbuterol hydrochloride.