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Neonates exposed to opioids in utero were randomly allocated to one of three treatment groups. When a predefined threshold of a modified Finnegan score was reached, treatment started and increased stepwise until symptoms were controlled. If symptoms could not be controlled with the predefined maximal dose of a single drug, a second drug was added. Among 143 infants recruited, 120 needed pharmacological treatment. Median length of treatment for morphine was 22 days (95% CI 18 to 33), for chlorpromazine 25 days (95% CI 21 to 34), and for phenobarbital 32 days (95% CI 27 to 38) (<jats:italic>p<\/jats:italic> = ns). In the morphine group, only 3% of infants (1\/33) needed a second drug; in the chlorpromazine group, this proportion was 56% (24\/43), and in the phenobarbital group 30% (13\/44).<\/jats:p>\n<jats:p><jats:italic>Conclusion<\/jats:italic>: None of the drugs tested for treating neonatal abstinence syndrome resulted in a significantly shorter treatment length than the others. As morphine alone was able to control symptoms in almost all infants, it may be preferred to the two other drugs but should still be tested against more potent opioids such as buprenorphine.<\/jats:p>\n<jats:p><jats:italic>Trial registration<\/jats:italic>: At <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"http:\/\/clinicaltrials.gov\">ClinicalTrials.gov<\/jats:ext-link> NCT02810782 (registered retrospectively).<jats:table-wrap><jats:table><jats:tbody><jats:tr><jats:td colspan=\"2\"><jats:bold>What is Known:<\/jats:bold>\u2022 <jats:italic>Neonates exposed to opiates in utero and presenting with withdrawal symptoms should first be treated by non-pharmacological supportive measures.<\/jats:italic>\u2022 <jats:italic>In those who fail, drugs have to be given, but there is controversy which drug is best.<\/jats:italic><\/jats:td><\/jats:tr><jats:tr><jats:td colspan=\"2\"><jats:bold>What is New:<\/jats:bold>\u2022 <jats:italic>Among three candidates, morphine, chlorpromazine and phenobarbital, none resulted in significantly shorter treatment time.<\/jats:italic>\u2022 <jats:italic>As morphine alone was able to control symptoms in almost all infants, it may be preferred to the two other drugs.<\/jats:italic><\/jats:td><\/jats:tr><\/jats:tbody><\/jats:table><\/jats:table-wrap><\/jats:p>","DOI":"10.1007\/s00431-019-03486-6","type":"journal-article","created":{"date-parts":[[2019,11,6]],"date-time":"2019-11-06T09:03:09Z","timestamp":1573030989000},"page":"141-149","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Treatment of opioid withdrawal in neonates with morphine, phenobarbital, or chlorpromazine: a randomized double-blind trial"],"prefix":"10.1007","volume":"179","author":[{"name":"On behalf of the Swiss neonatal abstinence syndrome study group","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Urs","family":"Zimmermann","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christoph","family":"Rudin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Angelo","family":"Du\u00f2","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Leonhard","family":"Held","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4458-1161","authenticated-orcid":false,"given":"Hans Ulrich","family":"Bucher","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2019,11,6]]},"reference":[{"key":"3486_CR1","doi-asserted-by":"publisher","first-page":"743","DOI":"10.1007\/s00431-015-2686-2","volume":"175","author":"K Allegaert","year":"2016","unstructured":"Allegaert K, Sherwin C (2016) Neonates and medicines: a roadmap to further improve neonatal pharmaceutical care. 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