The Basics
What is Pirbuterol?
Used to prevent and treat wheezing, shortness of breath, coughing, and chest tightness caused by asthma, chronic bronchitis, emphysema, and other lung diseases.
Brand names for Pirbuterol
Maxair
How Pirbuterol is classified
Anti-Asthmatic Agents, Bronchodilator Agents, Beta Adrenergic Agonists
Pirbuterol During Pregnancy
Pirbuterol pregnancy category
Category CNote that the FDA has deprecated the use of pregnancy categories, so for some medications, this information isn’t available. We still think it’s useful to list historical info, however, given what a common proxy this has been in the past.
What we know about taking Pirbuterol while pregnant
Pirbuterol was not teratogenic in rats administered oral doses of 30, 100, and 300 mg/kg (approximately 100, 340, and 1000 times the maximum recommended daily inhalation dose for adults on a mg/m2 basis). Pirbuterol was not teratogenic in rabbits administered oral doses of 30 and 100 mg/kg (approximately 200 and 680 times the maximum recommended inhalation dose for adults on a mg/m2 basis). However, pirbuterol at anoral dose of 300mg/kg (approximately 2000times the maximum recommended daily inhalation dose in adults on a mg/m2 basis) caused abortions and fetal death. There are no adequate and well-controlled studies in pregnant women. Pirbuterol should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
Taking Pirbuterol While Breastfeeding
What are recommendations for lactation if you're taking Pirbuterol?
Although no published data exist on the use of pirbuterol by mouth or inhaler during lactation, data from the related drug, terbutaline, indicate that very little is expected to be excreted into breastmilk.[1] The authors of several reviews and an expert panel agree that use of inhaled bronchodilators is acceptable during breastfeeding because of the low bioavailability and maternal serum levels after use.[2][3][4][5][6]
Maternal / infant drug levels
Although no published data exist on the use of pirbuterol by mouth or inhaler during lactation, data from the related drug, terbutaline, indicate that very little is expected to be excreted into breastmilk.[1] The authors of several reviews and an expert panel agree that use of inhaled bronchodilators is acceptable during breastfeeding because of the low bioavailability and maternal serum levels after use.[2][3][4][5][6]
Possible effects of Pirbuterol on milk supply
Relevant published information was not found as of the revision date.
Possible alternatives to Pirbuterol
Terbutaline.
List of References
Lactation sources: Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Library of Medicine (US); 2006-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK501922/1. Lindberg C, Boreus LO, de Chateau P et al. Transfer of terbutaline into breast milk. Eur J Resp Dis. 1984;65(suppl 134):87-91. PMID: 6586490
2. McDonald CF, Burdon JGW. Asthma in pregnancy and lactation. A position paper for the Thoracic Society of Australia and New Zealand. Med J Aust. 1996;165:485-8. PMID: 8937369
3. Ellsworth A. Pharmacotherapy of asthma while breastfeeding. J Hum Lact. 1994;10:39-41. PMID: 7619245
4. Nelson-Piercy C. Asthma in pregnancy. Thorax. 2001;56:325-8. PMID: 11254828
5. Taddio A, Ito S. Drugs and breast-feeding. In: Koren G, ed. Maternal-fetal toxicology. A clinician’s guide. 3rd ed. New York: Marcel Dekker, 2001:177-32.
6. National Heart, Lung, and Blood Institute, National Asthma Education and Prevention Program Asthma and Pregnancy Working Group. NAEPP expert panel report. Managing asthma during pregnancy: recommendations for pharmacologic treatment-2004 update. 2004;1-57. http://www.nhlbi.nih.gov/health/prof/lung/asthma/astpreg.htm
Disclaimer: This material is provided for educational purposes only and is not intended for medical advice, diagnosis, or treatment. Consult your healthcare provider with any questions.
