Pirbuterol

Pirbuterol
Clinical data
Trade names	Maxair
AHFS/Drugs.com	Consumer Drug Information
MedlinePlus	a601096
Pregnancy; category	C;
Routes of; administration	Inhalational (MDI)
ATC code	R03AC08 (WHO) R03CC07 (WHO);
Legal status
Legal status	AU: S4 (Prescription only); US: ℞-only;
Identifiers
	IUPAC name (RS)-6-[2-(tert-butylamino)-1-hydroxyethyl]-2-(hydroxymethyl)pyridin-3-ol;
CAS Number	38677-81-5 ; HCl: 38029-10-6 ;
PubChem CID	4845;
IUPHAR/BPS	7272;
DrugBank	DB01291 ;
ChemSpider	4679 ;
UNII	OG645J8RVW; HCl: J6793T658K ;
KEGG	D08387 ;
ChEMBL	ChEMBL1094966 ;
CompTox Dashboard (EPA)	DTXSID0046937 ;
Chemical and physical data
Formula	C12H20N2O3
Molar mass	240.303 g·mol−1
3D model (JSmol)	Interactive image;
Chirality	Racemic mixture
	SMILES Oc1ccc(nc1CO)C(O)CNC(C)(C)C;
	InChI InChI=1S/C12H20N2O3/c1-12(2,3)13-6-11(17)8-4-5-10(16)9(7-15)14-8/h4-5,11,13,15-17H,6-7H2,1-3H3 ; Key:VQDBNKDJNJQRDG-UHFFFAOYSA-N ;
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Pirbuterol (trade name Maxair) is a short-acting β₂ adrenoreceptor agonist with bronchodilating action used in the treatment of asthma, available (as pirbuterol acetate) as a breath-activated metered-dose inhaler.

It was patented in 1971 and came into medical use in 1983.^[1]

Medical use

Pirbuterol is used in asthma for reversal of acute bronchospasm, and also as a maintenance medication to prevent future attacks. It should be used in patients 12 years of age and older with or without concurrent theophylline and/or inhaled corticosteroid.^[2]^[3]

Mode of action

Pharmacokinetics

After inhalation of doses up to 800 μg (twice the maximum recommended dose) systemic blood levels of pirbuterol are below the limit of assay sensitivity (2–5 ng/ml). A mean of 51% of the dose is recovered in urine as pirbuterol plus its sulfate conjugate following administration by aerosol. Pirbuterol is not metabolized by catechol-O-methyltransferase. The plasma half-life measured after oral administration is about two hours.^[2]

Adverse effects

References

^ Fischer J, Ganellin CR (2006). Analogue-based Drug Discovery. John Wiley & Sons. p. 543. ISBN 9783527607495.
^ ^a ^b "Maxair Autohaler (pirbuterol acetate inhalation aerosol) For Oral Inhalation Only. U.S. Full Prescribing Information". 3M Pharmaceuticals. Northridge, CA 91324. Archived from the original on 20 September 2018. Retrieved 7 March 2016.
^ Bianchi M, Clavenna A, Bonati M (September 2010). "Inter-country variations in anti-asthmatic drug prescriptions for children. Systematic review of studies published during the 2000-2009 period" (PDF). European Journal of Clinical Pharmacology. 66 (9): 929–36. doi:10.1007/s00228-010-0845-y. PMID 20533030. S2CID 21834280.

External links

RxList: Maxair (Pirbuterol)

[Fis2006-1] Fischer J, Ganellin CR (2006). Analogue-based Drug Discovery. John Wiley & Sons. p. 543. ISBN 9783527607495.

[PI-2] "Maxair Autohaler (pirbuterol acetate inhalation aerosol) For Oral Inhalation Only. U.S. Full Prescribing Information". 3M Pharmaceuticals. Northridge, CA 91324. Archived from the original on 20 September 2018. Retrieved 7 March 2016.

[BianchiClavenna2010-3] Bianchi M, Clavenna A, Bonati M (September 2010). "Inter-country variations in anti-asthmatic drug prescriptions for children. Systematic review of studies published during the 2000-2009 period" (PDF). European Journal of Clinical Pharmacology. 66 (9): 929–36. doi:10.1007/s00228-010-0845-y. PMID 20533030. S2CID 21834280.

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