Clinical data
AHFS/Drugs.com monograph
MedlinePlus a682084
  • AU: A
  • US: C (Risk not ruled out)
Routes of
Inhalation (MDI) and tablets
ATC code R03AB03 (WHO) R03CB03 (WHO)
R03CB53 (WHO)
Legal status
Legal status
Pharmacokinetic data
Bioavailability 3% if inhaled, 40% if taken orally
Metabolism Gastrointestinal and hepatic
Biological half-life 6 hours
CAS Number 586-06-1 YesY
PubChem (CID) 4086
DrugBank DB00816 N
ChemSpider 3944 YesY
UNII 53QOG569E0 YesY
KEGG D08300 YesY
ECHA InfoCard 100.008.701
Chemical and physical data
Formula C11H17NO3
Molar mass 211.258 g/mol
3D model (Jmol) Interactive image
Chirality Racemic mixture
Solubility in water 9.7 mg/mL (20 °C)
 NYesY (what is this?)  (verify)

Orciprenaline (INN), also known as metaproterenol (USAN), is a bronchodilator used in the treatment of asthma.[1][2] Orciprenaline is a moderately selective β2 adrenergic receptor agonist that stimulates receptors of the smooth muscle in the lungs, uterus, and vasculature supplying skeletal muscle, with minimal or no effect on α adrenergic receptors. The pharmacologic effects of β adrenergic agonist drugs, such as orciprenaline, are at least in part attributable to stimulation through β adrenergic receptors of intracellular adenylyl cyclase, the enzyme which catalyzes the conversion of ATP to cAMP. Increased cAMP levels are associated with relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from many cells, especially from mast cells.

Possible side effects

Rare side effects that could be life-threatening

Brand names


  1. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS (2011). "DrugBank 3.0: a comprehensive resource for omics research on drugs". Nucleic Acids Res. 39 (Database issue): D1035–41. doi:10.1093/nar/gkq1126. PMC 3013709Freely accessible. PMID 21059682.
  2. Wishart DS, Knox C, Guo AC, Cheng D, Shrivastava S, Tzur D, Gautam B, Hassanali M (2008). "DrugBank: a knowledgebase for drugs, drug actions and drug targets". Nucleic Acids Res. 36 (Database issue): D901–6. doi:10.1093/nar/gkm958. PMC 2238889Freely accessible. PMID 18048412.

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