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Drugs and Lactation Database (LactMed®) [Internet]. Bethesda (MD): National Institute of Child Health and Human Development; 2006-.
CASRN: 3930-20-9
Drug Levels and Effects
Summary of Use during Lactation
Because of its extensive excretion into breastmilk, its renal excretion and minimal safety data in breastfed infants, other beta-adrenergic blocking drugs are preferred to sotalol, especially while nursing a newborn or preterm infant. Some authors recommend using sotalol during breastfeeding only while monitoring the infant closely for signs of beta-blockade.[1] Infants over 2 months of age have more mature kidney function and are less likely to be affected by sotalol in milk.
Drug Levels
The excretion of beta-adrenergic blocking drugs into breastmilk is largely determined by their protein binding. Those with low binding are more extensively excreted into breastmilk.[1,2]Accumulation of the drugs in the infant is related to the fraction excreted in urine. With 0% protein binding, 80 to 90% renal excretion and a moderately long half-life, sotalol presents a high risk for accumulation in infants, especially neonates. It is estimated that a fully breastfed infant would receive 22% of the maternal weight-adjusted dosage of sotalol.[3]
Maternal Levels. Twenty milk samples from 5 mothers at various times during the first 7 days postpartum while taking sotalol 200 to 600 mg daily orally had average sotalol milk levels of 10.5 mg/L (range 4.8 to 20.2 mg/L).[4]
One woman taking sotalol 80 mg three times daily on day 5 postpartum had sotalol milk levels of 4.1 and 3.7 mg/L at 6.3 and 7 hours after a dose, respectively. She was restudied at 105 days postpartum while taking 80 mg twice daily. Her milk sotalol levels were 2.4 and 3.2 mg/L at 2.8 and 3.3 hours after a dose, respectively.[1]
A mother taking oral sotalol 80 mg twice daily had milk sotalol levels of 5 and 4.4 mg/L at 3 hours after the dose on days 5 and 7 postpartum.[5]
Infant Levels. Relevant published information was not found as of the revision date.
Effects in Breastfed Infants
A study of mothers taking beta-blockers during nursing found a numerically, but not statistically significant increased number of adverse reactions in those taking any beta-blocker. Although the ages of infants were matched to control infants, the ages of the affected infants were not stated. One of the mothers was taking sotalol.[6]
Bradycardia was not seen in one 12-day-old infant who was breastfed from birth during maternal use of 600 mg of sotalol daily.[4] In another breastfed infant whose mother was taking 80 mg 2 to 3 times daily for more than 3 months, no bradycardia was seen and developmental milestones were achieved normally.[1]
Beta-adrenergic blocking drugs with similar breastmilk excretion characteristics and renal elimination have caused adverse effects in breastfed newborns.[7,8]
Effects on Lactation and Breastmilk
Relevant published information on the effects of beta-blockade or sotalol during normal lactation was not found as of the revision date. A study in 6 patients with hyperprolactinemia and galactorrhea found no changes in serum prolactin levels following beta-adrenergic blockade with propranolol.[9]
Alternate Drugs to Consider
References
- 1.
- Hackett LP, Wojnar-Horton RE, Dusci LJ, et al. Excretion of sotalol in breast milk. Br J Clin Pharmacol 1990;29:277-8. Letter. PMID: 2306424. [PMC free article: PMC1380099] [PubMed: 2306424]
- 2.
- 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. [PubMed: 2878668]
- 3.
- Atkinson HC, Begg EJ, Darlow BA. Drugs in human milk: Clinical pharmacokinetic considerations. Clin Pharmacokinet. 1988;14:217–40. [PubMed: 3292101]
- 4.
- O'Hare MF, Murnaghan GA, Russell CJ, et al. Sotalol as a hypotensive agent in pregnancy. Br J Obstet Gynaecol. 1980;87:814–20. [PubMed: 7426541]
- 5.
- Wagner X, Jouglard J, Moulin M, et al. Coadministration of flecainide acetate and sotalol during pregnancy: Lack of teratogenic effects, passage across the placenta, and excretion in human breast milk. Am Heart J. 1990;119:700–2. [PubMed: 1689933]
- 6.
- Ho TK, Moretti ME, Schaeffer JK, et al. Maternal beta-blocker usage and breast feeding in the neonate. Pediatr Res. 1999;45(4, pt. 2):67A–Abstract 385. [CrossRef]
- 7.
- 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. [PubMed: 3770068]
- 8.
- Schimmel MS, Eidelman AI, Wilschanski MA, et al. Toxic effects of atenolol consumed during breast feeding. J Pediatr. 1989;114:476–8. [PubMed: 2921694]
- 9.
- Board JA, Fierro RJ, Wasserman AJ, et al. Effects of alpha- and beta-adrenergic blocking agents on serum prolactin levels in women with hyperprolactinemia and galactorrhea. Am J Obstet Gynecol. 1977;127:285–7. [PubMed: 556882]
Substance Identification
Substance Name
Sotalol
CAS Registry Number
3930-20-9
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