Objectives: To provide information about the off-label rate of all drug prescriptions in neonates and infants up to 1 year in Spain. Also, to analyse the off-label prescription of medicines under current practice in this age group according to different evidence sources.Study design: A five-year (2015-2019) exploratory observational study about off-label prescription in neonates and infants (0 to 1 year) at primary health care in Spain. All drug prescriptions in this age group were analysed and classified according to their labelling in off-label or on-label. The drugs prescribed off-label were subsequently reviewed in national formularies and other databases to assess its evidence of use beyond what is recommended in the Summary of Product Characteristics (SmPC).Results: On average 34.50% of total prescriptions were prescribed off-label according to the SmPC. 17.93% of total prescriptions in neonates and infants up to 1 year old were not based on clinical evidence from SmPC, Pediamécum, BNF or DailyMed. In more than 88% of cases, off-label use was related to the posology section of the SmPC, followed by the therapeutic indications and contraindications sections, in 35.20% and 24.10% of cases, respectively. Almost 13% of off-label drugs were over-the-counter. Salbutamol followed by topical tobramycin and colecalciferol were the drugs most prescribed off-label.Conclusions: Off-label use of drugs remains as an important public health concern, especially for neonates and infants up to 1 year, who receive the greatest proportion of offlabel prescriptions. The evidence-based off-label prescription is a widespread practice that has shown a stable trend during the 5-year study period providing also a certain extent of flexibility to paediatricians in some therapeutic decisions.
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