Willemijn M. Meijer

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BACKGROUND The prevalence of attention-deficit/hyperactivity disorder (ADHD) and the associated use of stimulant medications may have increased in the Netherlands in recent years, but there is a lack of data to confirm this trend. This retrospective analysis examined the incidence, prevalence, and treatment pattern of ADHD among children from a large sample(More)
OBJECTIVE To describe drug use in pregnancy, and compare drug use of pregnant women with non-pregnant women with respect to possible teratogenicity. STUDY DESIGN A cross-sectional study based on pharmacy records from 1997 to 2001 was performed. Pregnant women and matched non-pregnant women (same physician and age) were identified. Prescriptions were set(More)
BACKGROUND Clomiphene, a drug used to induce ovulation, is chemically related to diethylstilbestrol (DES). DES is associated with vaginal cancer and infertility among daughters and with hypospadias among second-generation male offspring. Because clomiphene has a long half-life and metabolites have been found in feces up to 6 weeks after administration,(More)
To study the association between attention deficit hyperactivity disorder (ADHD) drug use and the incidence of hospitalization due to injuries. A random sample of 150,000 persons (0–18 years) was obtained from the Dutch PHARMO record linkage system. An ADHD medication cohort as well as an up to six age/sex/index date sampled control cohort with no history(More)
PURPOSE To determine the thromboprophylactic treatment pattern and occurrence of venous thromboembolism (VTE), major bleeding, and wound infections in patients undergoing total knee replacement (TKR) or total hip replacement (THR). METHODS From the PHARMO database, all patients ≥ 18 years hospitalized for TKR or THR between January 2003 and September 2008(More)
OBJECTIVE To evaluate the number of patients reaching stable treatment with a stimulant (methylphenidate or dexamphetamine) or non-stimulant (atomoxetine) attention-deficit/hyperactivity disorder (ADHD) medication approved for use in the Netherlands, and the time to treatment stabilization among children and adolescents aged 6-17 years. RESEARCH DESIGN(More)
Since the protective effect of folic acid (FA) on birth defects is well known, it is reasonable to assume intrauterine exposure to FA antagonists increases the risk on these defects. We have therefore performed case-control analyses to investigate the risk of intrauterine exposure to FA antagonists, using data on births from the EUROCAT Northern Netherlands(More)
OBJECTIVES To investigate the relationship between duration of compliant bisphosphonate use and the risk of osteoporotic fractures. METHODS The PHARMO database was used to identify new female bisphosphonate users, aged ≥ 45 years or with diagnosed post-menopausal osteoporosis in the period of January 1996 - June 2004. Within this cohort a matched(More)
Background New drugs and new formulations enter the growing market for ADHD medication. The growing awareness of possible persistence of ADHD impairment beyond childhood and adolescence resulting in increased pharmacotherapy of ADHD in adults, is also a good reason for making an inventory of the what is generally known about pharmacotherapy in ADHD. Aim To(More)
Objective: To detect whether there were socio‐economic differences in the overall use of prescription and OTC drugs among adolescents. Methods: This study was a secondary analysis of questionnaire data collected to investigate socio‐economic differences in health risk behaviour and decision‐making. Results: About 20% of the 741 girls and 10% of the 736 boys(More)