Hum. Reprod. Advance Access originally published online on June 3, 2006
Human Reproduction 2006 21(9):2290-2295; doi:10.1093/humrep/del194
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Antiepileptic drug use and birth rate in patients with epilepsya population-based cohort study in Finland
1 School of Public Health, University of Tampere, Tampere 2 Department of Neurology, University of Oulu, Oulu and 3 Pediatric Research Centre, Tampere University Hospital, Tampere, Finland
4 To whom correspondence should be addressed at: Tampere School of Public Health, University of Tampere, Tampere 33014, Finland. E-mail: miia.artama{at}uta.fi
5 Address during the study: GlaxoSmithKline, Neurosciences MDC, Research Triangle Park, NC 27709, USA
BACKGROUND: Antiepileptic medication use affects reproductive endocrine function, but its impact on fertility is not well known. METHODS: All epilepsy patients, who were approved as being eligible for reimbursement for antiepileptic drug (AED) costs from the Social Insurance Institution (SII) of Finland for the first time 198594, were identified from the SII database. A reference cohort without epilepsy was identified from the Finnish Population Register Centre. Information on AED purchases 19962000 was obtained from the SII database through computerized record linkage with the unique personal identification number assigned to all residents of Finland. The three AEDs included were carbamazepine, oxcarbazepine (OXC) and valproate. RESULTS: Birth rate was lower in both men and women with epilepsy on AEDs than in the reference cohort without epilepsy. However, compared with patients not using AED during the study period, the birth rate was lowered only among men on OXC [rate ratio (RR) = 0.52, 95% confidence interval (CI) = 0.32, 0.84]. CONCLUSIONS: The birth rate was lower in both women and men on any of the three AEDs compared with the reference cohort without epilepsy. However, a statistically significant difference between treated and untreated patients was only seen in men on OXC. It is unclear to what extent the differences found in this study are due to social or biological factors.
Key words: antiepileptic drug/birth rate/cohort study/epilepsy
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