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  • Title: Relationship between adverse effects of antiepileptic drugs, number of coprescribed drugs, and drug load in a large cohort of consecutive patients with drug-refractory epilepsy.
    Author: Canevini MP, De Sarro G, Galimberti CA, Gatti G, Licchetta L, Malerba A, Muscas G, La Neve A, Striano P, Perucca E, SOPHIE Study Group.
    Journal: Epilepsia; 2010 May; 51(5):797-804. PubMed ID: 20545754.
    Abstract:
    PURPOSE: To evaluate the adverse effects (AEs) of antiepileptic drugs (AEDs) in adults with refractory epilepsy and their relationship with number of coprescribed AEDs and AED load. METHODS: Patients with refractory epilepsy were enrolled consecutively at 11 tertiary referral centers. AEs were assessed through unstructured interview and the Adverse Event Profile (AEP) questionnaire. AED loads were calculated as the sum of prescribed daily dose (PDD)/defined daily dose (DDD) ratios for each coprescribed AED. RESULTS: Of 809 patients enrolled, 709 had localization-related epilepsy and 627 were on polytherapy. AED loads increased with increasing number of AEDs in the treatment regimen, from 1.2 +/- 0.5 for patients on monotherapy to 2.5 +/- 1, 3.7 +/- 1.1, and 4.7 +/- 1.1 for those on two, three, and > or =4 AEDs, respectively. The number of spontaneously reported AEs correlated with the number of AEs identified by the AEP (r = 0.27, p < 0.0001). AEP scores did not differ between patients with monotherapy and patients with polytherapy (42.8 +/- 11.7 vs. 42.6 +/- 11.2), and there was no correlation between AEP scores and AED load (r = -0.05, p = 0.16). CONCLUSIONS: AEs did not differ between monotherapy and polytherapy patients, and did not correlate with AED load, possibly as a result of physicians' intervention in individualizing treatment regimens. Taking into account the limitations of a cross-sectional survey, these findings are consistent with the hypothesis that AEs are determined more by individual susceptibility, type of AEDs used, and physicians' skills, than number of coprescribed AEDs and AED load.
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