A study published in BMCMedicine and conducted in UK finds that the prevalence of polypharmacy (use of multiple medications) during pregnancy has increased over the past two decades, particularly in women with multimorbidity.
]. Nearly 350,000 medications and medical products are available in the CPRD database’s product dictionary. CPRD has classified these products into a list of 1668 categories, assigning each product an eight-digit code broadly representing the BNF chapter and section the product fits into. When a product was classified into more than one category, it was randomly assigned to a category to keep the medication categories mutually exclusive of their product components.
To identify the top 10 commonly prescribed medications during the first trimester, the proportion of pregnancies with a prescription for each medication category during the first trimester was calculated. This was done by dividing the number of pregnancies with a prescription record of the medication during the first trimester by the total number of pregnancies with complete follow-up during the first trimester.
From 577 individual medication categories, 166,176 medication pairs were possible. To identify the top 10 commonly prescribed medication pairs during the first trimester, the proportion of pregnancies with a prescription for each of the 166,176 possible medication pairs during the first trimester was estimated.
In a set of post hoc analyses, the proportions of pregnancies with a prescription record for each possible individual and medication pairs were estimated during the preconception period and a series of logistic regression models were run to assess the association between various risk factors and polypharmacy defined as 2 and 5 or more medications.
All tabulations were repeated for pregnancy cohorts with complete follow-up throughout pregnancy, sub-cohort of pregnancies affected by multimorbidity and all eligible pregnancies, i.e. pregnancies with or without complete follow-up. Stata IC, version 16 , was used to curate and analyse the data.Out of the 3,202,461 pregnancies available in the CPRD pregnancy register, 1,521,317 were eligible after implementation of the inclusion and exclusion criteria.
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