Over-the-counter drug use--estimations within the Swedish paediatric population.

We have used three different sources to estimate the use of drugs sold over the counter (OTC) by the Swedish paediatric population during 2007-2008 as part of a European evaluation initiated by the European Medicines Agency. An estimation of the paediatric use from the total numbers of over-the-counter drugs (OTCD) packages sold by Swedish pharmacies and analyses of two separate questionnaires directed towards a population of 11- to 14-year-old children and another towards visitors to one of the paediatric emergency wards in Stockholm County were included in the study. In Sweden, 1.25 OTC packages are sold quarterly per child (0-18 years), and the children in both questionnaire studies use, on average, 0.9 OTC substances. Sixty-five percent of the children visiting an emergency ward and 67% of the 13-year-old Stockholm inhabitants had used at least one OTCD. OTCD use among children is common. Interpretation of OTCD data must be done carefully since questions with regard to OTCD use is subject to recall bias and the number of packages sold to children is hypothesised through a conversion factor.