PMID- 30149139 OWN - NLM STAT- MEDLINE DCOM- 20181211 LR - 20181211 IS - 1873-1708 (Electronic) IS - 0890-6238 (Linking) VI - 81 DP - 2018 Oct TI - Ondansetron and teratogenicity in rats: Evidence for a mechanism mediated via embryonic hERG blockade. PG - 237-245 LID - S0890-6238(18)30097-2 [pii] LID - 10.1016/j.reprotox.2018.08.018 [doi] AB - The potent hERG channel blocking drug ondansetron is used off-label for treatment of nausea and vomiting in early pregnancy. Some human epidemiological studies have associated ondansetron with fetal cardiovascular defects and orofacial clefts. This study investigated the effects of ondanestron on embryonic heart rhythm of gestational day (GD) 13 rat embryos in vitro and then integrated the results with published animal teratology, and animal and human pharmacokinetic studies to perform a risk evaluation. Ondansetron caused concentration dependent bradycardia and arrhythmia. Cardiovascular malformations in rats occurred at exposures slightly higher than those in early human pregnancy. Together the results suggest that ondansetron can have teratogenic potential in rats and humans mediated via hERG block and severe heart rhythm disturbances in the embryo. The risk may be increased in human pregnancy if additional risk factors are present such as hypokalemia. CI - Copyright (c) 2018 Elsevier Inc. All rights reserved. FAU - Danielsson, B AU - Danielsson B AD - Swedish National Board of Health and Welfare, Stockholm, Sweden. Electronic address: Bengt.Danielsson@socialstyrelsen.se. FAU - Webster, William S AU - Webster WS AD - Discipline of Anatomy and Histology, Sydney Medical School, The University of Sydney, Sydney, NSW 2006, Australia. Electronic address: bill.webster@sydney.edu.au. FAU - Ritchie, Helen E AU - Ritchie HE AD - Discipline of Biomedical Sciences, Sydney Medical School, The Unvieristy of Sydney, Sydney, NSW 2006, Australia. Electronic address: helen.ritchie@sydney.edu.au. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20180824 PL - United States TA - Reprod Toxicol JT - Reproductive toxicology (Elmsford, N.Y.) JID - 8803591 RN - 0 (Antiemetics) RN - 0 (Ether-A-Go-Go Potassium Channels) RN - 0 (Teratogens) RN - 4AF302ESOS (Ondansetron) SB - IM MH - Abnormalities, Drug-Induced/etiology MH - Animals MH - Antiemetics/pharmacokinetics/*toxicity MH - Cardiovascular Abnormalities/chemically induced MH - Embryo, Mammalian/abnormalities/drug effects MH - Ether-A-Go-Go Potassium Channels/*antagonists & inhibitors MH - Female MH - Heart/drug effects MH - Humans MH - Ondansetron/pharmacokinetics/*toxicity MH - Pregnancy MH - Rats, Sprague-Dawley MH - Teratogens/pharmacokinetics/*toxicity OTO - NOTNLM OT - Birth defects OT - Heart arrhythmia OT - Nausea and vomiting in pregnancy OT - Ondansetron EDAT- 2018/08/28 06:00 MHDA- 2018/12/12 06:00 CRDT- 2018/08/28 06:00 PHST- 2018/03/17 00:00 [received] PHST- 2018/08/23 00:00 [revised] PHST- 2018/08/23 00:00 [accepted] PHST- 2018/08/28 06:00 [pubmed] PHST- 2018/12/12 06:00 [medline] PHST- 2018/08/28 06:00 [entrez] AID - S0890-6238(18)30097-2 [pii] AID - 10.1016/j.reprotox.2018.08.018 [doi] PST - ppublish SO - Reprod Toxicol. 2018 Oct;81:237-245. doi: 10.1016/j.reprotox.2018.08.018. Epub 2018 Aug 24.