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Systematic (IUPAC) name
CAS number 586-06-1
ATC code R03AB03 R03CB03
PubChem 4086
Chemical data
Formula C11H17NO3 
Mol. mass 211.258 g/mol
SMILES search in eMolecules, PubChem
Physical data
Solubility in water 9.7 mg/mL (20 °C)
Pharmacokinetic data
Bioavailability 3% if inhaled, 40% if taken orally
Metabolism Gastrointestinal and hepatic
Half life 6 hours
Excretion  ?
Therapeutic considerations
Pregnancy cat.


Legal status


Routes Inhalation / tablets

Orciprenaline (INN, also known as metaproterenol) is a bronchodilator used in the treatment of asthma. Orciprenaline is a moderately selective beta2-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 alpha-adrenergic receptors. The pharmacologic effects of beta adrenergic agonist drugs, such as orciprenaline, are at least in part attributable to stimulation through beta adrenergic receptors of intracellular adenyl 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.

Brand names

Brand names for orciprenaline include Alotec, Alupent, Metaprel and Novasmasol.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Orciprenaline". A list of authors is available in Wikipedia.
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