Oxybutinyn
CASRN: 5633-20-5
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Drug Levels and Effects:
Summary of Use during Lactation:
No information is available on the use of oxybutynin during breastfeeding. Long-term use of oxybutynin might reduce milk production or milk letdown, but a single dose is not likely to interfere with breastfeeding. During long-term use, observe for signs of decreased lactation (e.g., insatiety, poor weight gain).
Drug Levels:
Maternal Levels. Relevant published information was not found as of the revision date.
Infant Levels. Relevant published information was not found as of the revision date.
Effects in Breastfed Infants:
Relevant published information was not found as of the revision date.
Possible Effects on Lactation:
Relevant published information in nursing mothers was not found as of the revision date. Anticholinergics can inhibit lactation in animals apparently by inhibiting growth hormone and oxytocin secretion.[1][2][3][4][5] Anticholinergic drugs can also reduce serum prolactin in nonnursing women.[6] The manufacturer reports that cases of lactation suppression have been reported with oxybutynin in postmarketing surveillance.[7] The prolactin level in a mother with established lactation may not affect her ability to breastfeed.
References:
1. Aaron DK, Ely DG, Deweese WP et al. Reducing milk production in ewes at weaning using restricted feeding and methscopolamine bromide. J Anim Sci. 1997;75:1434-42. PMID: 9250502
2. Powell MR, Keisler DH. A potential strategy for decreasing milk production in the ewe at weaning using a growth hormone release blocker. J Anim Sci. 1995;73:1901-5. PMID: 7592071
3. Daniel JA, Thomas MG, Powell MR, Keisler DH. Methscopolamine bromide blocks hypothalmic-stimulated release of growth hormone in ewes. J Anim Sci. 1997;75:1359-62. PMID: 9159285
4. Bizzarro A, Iannucci F, Tolino A et al. Inhibiting effect of atropine on prolactin blood levels after stimulation with TRH. Clin Exp Obstet Gynecol. 1980;7:108-11. PMID: 6788407
5. Svennersten K, Nelson L, Juvnas-Moberg K. Atropinization decreases oxytocin secretion in dairy cows. Acta Physiol Scand. 1992;145:193-4. PMID: 1636447
6. Masala A, Alagna S, Devilla L et al. Muscarinic receptor blockade by pirenzepine: effect on prolactin secretion in man. J Endocrinol Invest. 1982;5:53-5. PMID: 6808052
7. Ditropan package insert. Ortho-McNeil Pharmaceutical, Inc., Raritan, NJ. February 2008.
Substance Identification:
Substance Name: Oxybutinyn
CAS Registry Number: 5633-20-5
Drug Class:
Muscarinic Antagonists
Parasympatholytics
Administrative Information:
LactMed Record Number:
766
Last Revision Date:
20120403
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