Effects of codeine on pregnancy outcome: results from a large population-based cohort study.
Eur J Clin Pharmacol 67(12):1253-61 (2011) PMID 21656212 PMCID PMC3214255
Guidelines on codeine safety during pregnancy rely on small studies with inconsistent results, and associations between codeine use during pregnancy and increased risk of congenital malformations remain unsubstantiated.
DOI: 10.1007/s00228-011-1069-5
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