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Safety of cetirizine in pregnancy.
Journal of Obstetrics and Gynaecology : the Journal of the Institute of Obstetrics and Gynaecology 2018 October
Managing symptoms of allergic rhinitis (AR) and urticaria in pregnant women is important to reduce complications and negative outcomes. The objective of this study was to provide information on the pregnancy outcomes of women exposed to the antihistamine cetirizine (CTZ). The UCB Pharma Patient Safety Database was searched for pregnancies up to 28 February 2015. Maternal CTZ exposure reports were extracted, and pregnancy outcomes were examined, including exposure, comorbidities and infant events. 228 of 522 pregnancies with maternal CTZ exposure had available outcomes; 49 were prospective. The majority (83.7%) resulted in live births; four spontaneous miscarriages, three induced abortions and one stillbirth were reported. Most pregnancies were exposed during the first trimester. Two congenital malformations were reported. The results suggest that CTZ exposure is not associated with adverse pregnancy outcomes above the background rates. While reassuring, the strengths and limitations of a safety database study need to be considered. Impact statement What is already known on this subject? AR and urticaria can substantially affect pregnant women, and adequately managing their symptoms is important to reduce maternal and foetal complications. Antihistamines are efficacious, however, there is still a lack of data regarding use during pregnancy. Although current evidence indicates that antihistamines are well-tolerated during pregnancy, data regarding foetal safety are inconclusive. What do the results of this study add? Our study suggests that CTZ exposure during pregnancy is not linked to an increase in adverse outcomes. CTZ exposure mainly happened during the first trimester only, when most organogenesis takes place. Most of the maternally exposed, prospective pregnancies resulted in live births (83.7%). Congenital malformations occurred in 2/41 live births from the CTZ-exposed pregnancies. What are the implications of these findings for clinical practice and/or further research? Our study presents a detailed data analysis from a large number of CTZ-exposed pregnancies, and its results are in line with those from previous reports. While the limitations of a safety database study need to be considered, the results shown here are reassuring. Further prospectively reported pregnancies are required, before definite conclusions on the risks of CTZ exposure during pregnancy can be drawn.
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