Subramanian, AnuradhaaAzcoaga-Lorenzo, AmayaAnand, AsthaPhillips, KatherineLee, Siang IngCockburn, NeilFagbamigbe, Adeniyi FrancisDamase-Michel, ChristineYau, ChristopherMcCowan, ColinO'Reilly, DermotSantorelli, GillianHope, HollyKennedy, Jonathan IAbel, Kathryn MEastwood, Kelly-AnnLocock, LouiseBlack, MaireadLoane, MariaMoss, NgawaiPlachcinski, RachelThangaratinam, ShakilaBrophy, SineadAgrawal, UtkarshVowles, ZoeBrocklehurst, PeterDolk, HelenNelson-Piercy, CatherineNirantharakumar, KrishnarajahMuM-PreDiCT Group2023-01-182023-01-182023-01-16Subramanian, A, Azcoaga-Lorenzo, A, Anand, A, Phillips, K, Lee, S I, Cockburn, N, Fagbamigbe, A F, Damase-Michel, C, Yau, C, McCowan, C, O'Reilly, D, Santorelli, G, Hope, H, Kennedy, J I, Abel, K M, Eastwood, K-A, Locock, L, Black, M, Loane, M, Moss, N, Plachcinski, R, Thangaratinam, S, Brophy, S, Agrawal, U, Vowles, Z, Brocklehurst, P, Dolk, H, Nelson-Piercy, C, Nirantharakumar, K & MuM-PreDiCT Group 2023, 'Polypharmacy during pregnancy and associated risk factors : a retrospective analysis of 577 medication exposures among 1.5 million pregnancies in the UK, 2000-2019', BMC medicine , vol. 21, no. 1, 21. https://doi.org/10.1186/s12916-022-02722-51741-7015ORCID: /0000-0002-8109-1930/work/126803771https://hdl.handle.net/2164/19853Acknowledgements Not applicable. Funding This work was funded by the Strategic Priority Fund “Tackling multimorbidity at scale” programme [grant number MR/W014432/1] delivered by the Medical Research Council and the National Institute for Health Research in partnership with the Economic and Social Research Council and in collaboration with the Engineering and Physical Sciences Research Council. BT was funded by the National Institute for Health Research (NIHR) West Midlands Applied Research Collaboration. AA, KP and SIL were funded as NIHR Academic Clinical Fellows. The views expressed are those of the authors and not necessarily those of the funders, the NIHR or the UK Department of Health and Social Care. The funders had no role in the study design, data collection and analysis, decision to publish or preparation of the manuscript.131376818engMultiple medicationsPolypharmacyMedicationsPrescriptionsPregnancyMultimorbidityMultiple long-term conditionsR MedicineNational Institute for Health Research (NIHR)Supplementary InformationRJournal article10.1186/s12916-022-02722-5211