Drug Levels and Effects:

Summary of Use during Lactation:

No data are available for the use of carteolol during breastfeeding. Because its excretion into breastmilk is probably extensive, otherbeta-adrenergic blocking drugs are preferred to oral carteolol while breastfeeding a neonate. Infants over 2 months of age have more mature kidney function and are less likely to be affected.

Ophthalmic use of carteolol by the mother should pose little risk to the breastfed infant. To substantially diminish the amount of drug that reaches the breastmilk after using eye drops, place pressure over the tear duct by the corner of the eye for 1 minute or more, then remove the excess solution with an absorbent tissue.

Drug Levels:

The excretion ofbeta-adrenergic blocking drugs into breastmilk is largely determined by their protein binding. Those with low binding are more extensively excreted into breastmilk.[1] Accumulation of the drugs in the infant is related to the fraction excreted in urine. With 60% protein binding, 15% renal excretion and a moderately long half-life, carteolol presents a relatively high risk for accumulation in infants, especially neonates.

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:

A study of mothers takingbeta-blockers during nursing found a numerically, but not statistically significant increased number of adverse reactions in those taking anybeta-blocker. Although the ages of infants were matched to control infants, the ages of the affected infants were not stated.. None of the mothers were taking carteolol.[2]Beta-adrenergic blocking drugs with similar breastmilk excretion characteristics have caused adverse effects in breastfed newborns. [3][4]

Possible Effects on Lactation:

A study in 6 patients with hyperprolactinemia and galactorrhea found no changes in serum prolactin levels followingbeta-adrenergic blockade with propranolol.[5] There are no reports on the effects ofbeta-blockade or carteolol use during normal lactation.

Alternate Drugs to Consider:

(Systemic) Propranolol,Labetalol,Metoprolol,(Ophthalmic) Levobunolol,Metipranolol,Timolol


1. Riant P, Urien S, Albengres E et al. High plasma protein binding as a parameter in the selection of betablockers for lactating women. Biochem Pharmacol. 1986;35:4579-81. PMID:2878668
2. Ho TK, Moretti ME, Schaeffer JK et al. Maternalbeta-blocker usage and breast feeding in the neonate. Pediatr Res. 1999;45:67A. Abstract 385.
3. Boutroy MJ, Bianchetti G, Dubruc C et al. To nurse when receiving acebutolol: is it dangerous for the neonate? Eur J Clin Pharmacol. 1986;30:737-9. PMID:3770068
4. Schimmel MS, Eidelman AI, Wilschanski MA et al. Toxic effects of atenolol consumed during breast feeding. J Pediatr. 1989;114:476-8. PMID:2921694
5. Board JA, Fierro RJ, Wasserman AJ, Bhatnagar AS. Effects of alpha- andbeta-adrenergic blocking agents on serum prolactin levels in women with hyperprolactinemia and galactorrhea. Am J Obstet Gynecol. 1977;127:285-7. PMID:556882

Substance Identification:

Substance Name:


CAS Registry Number:


Drug Class:

  • Adrenergic
  • beta
  • -Antagonists

  • Antiglaucoma Agents

  • Administrative Information:

    LactMed Record Number:


    Last Revision Date:

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