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Both oral retinoid and valproate containing medicines are highly teratogenic. Their use by women of childbearing age is controlled by risk minimization measures (RMMs) introduced by the European Medicine Agency, including the pregnancy prevention programme (PPP). In 2018, the RMMs were revised as previous measures were insufficient to prevent the use of these medicines during pregnancies. A cross-sectional survey was conducted among patients, physicians and pharmacists to evaluate the implementation of the revised RMMs in Belgium. The primary outcome was compliance with key aspects of the PPP. Differences in compliance between oral retinoid and valproate stakeholders were investigated. The relationship between potential determinants (population characteristics and RMM usage) and compliance was studied via multiple logistic regression. A total of 317 eligible patients, physicians and pharmacists participated. The majority of the studied patients fail to comply with the PPP, mainly driven by poor implementation of pregnancy testing. A large number of healthcare providers is unaware of the available educational materials. It is likely that a substantial part of Belgian women of childbearing age using oral retinoids or valproate insufficiently meet the PPP requirements. We propose to better inform healthcare providers about the mandatory PPPs and available educational materials as well as to support them with the implementation of such programmes to improve the safe use of these teratogenic medicines.

The implementation of risk minimization measures to prevent teratogenic pregnancy outcomes related to oral retinoid and valproate use in Belgium