Zuclopenthixol use while Breastfeeding
Zuclopenthixol Levels and Effects while Breastfeeding
Summary of Use during Lactation
Zuclopenthixol is not approved for marketing in the United States by the US Food and Drug Administration, but is available in Canada and other countries. Limited information indicates that maternal oral doses of up to 50 mg daily or depot injections of 72 mg every 2 weeks produce low levels in breastmilk and no detectable short-term adverse effects in the breastfed infants. No long-term data are available. Until more data are available, zuclopenthixol should be used with careful monitoring during breastfeeding.
Maternal Levels. Six women received zuclopenthixol during nursing. Five of the women were receiving the drug orally and one was receiving a depot injection. Oral dosages ranged from 4 to 50 mg daily of zuclopenthixol and the depot decanoate injection dosage was 72 mg every 2 weeks. Milk samples were obtained in the morning before the first oral dose of the day. Milk zuclopenthixol concentrations for 5 of the patients were between 1 and 2 mcg/L. The patient receiving the high oral dose of 50 mg daily had a breastmilk zuclopenthixol level of about 9 mcg/L.
One woman received zuclopenthixol for depression beginning 2 weeks postpartum. She initially received a dose of 24 mg daily (4 mg in the morning and 20 mg at night), but the dose was reduced to 14 mg daily (4 mg in the morning and 10 mg at night) after 4 days. Seven milk samples in total were obtained on days 2, 3, 6, and 8 of therapy. The average of the milk level with the 24 mg daily dosage was 20 mcg/L and with the 14 mg daily dosage it was 5 mcg/L. The authors estimated that an exclusively breastfed infant would receive 0.8 to 3 mcg/kg daily with the maternal doses given or 0.3 to 0.8% of the maternal weight-adjusted dosage.
Infant Levels. Relevant published information was not found as of the revision date.
Effects in Breastfed Infants
Six women received zuclopenthixol during nursing. Five of the women were receiving 4 to 50 mg daily by mouth and one was receiving a depot injection of 72 mg every 2 weeks. Their breastfed infants range in age from 3 days to 10 months old, 5 of whom were 2 months or under. No immediate adverse effects such infant drowsiness were noted.
Possible Effects on Lactation
Relevant published information was not found as of the revision date.
Alternate Drugs to Consider
1. Aaes-Jorgensen T, Bjorndal F, Bartels U. Zuclopenthixol levels in serum and breast milk. Psychopharmacology (Berl). 1986;90:417-8. PMID: 2878463
2. Matheson I, Skjaeraasen J. Milk concentrations of flupenthixol, nortriptyline and zuclopenthixol and between-breast differences in two patients. Eur J Clin Pharmacol. 1988;35:217-20. PMID: 3191943
CAS Registry Number
- Antipsychotic Agents
- Dopamine Antagonists
LactMed Record Number
Information from the National Library of Medicine's LactMed Database.
Last Revision Date
Information presented in this database is not meant as a substitute for professional judgment. You should consult your healthcare provider for breastfeeding advice related to your particular situation. The U.S. government does not warrant or assume any liability or responsibility for the accuracy or completeness of the information on this Site.