It has been speculated that patients with epilepsy in elderly is increasing. The effect of enzyme-inducing antiepileptic drugs (EIAED) on lipid metabolism is well known. However, the study in elderly subjects has been rarely conducted. Furthermore, it has not been directly assessed whether EIAED use causes the change of lipid levels from normal range to abnormal range. Adult patients with epilepsy (235 on EIAED, 213 on non-EIAED) were divided by age (20-64, 65-74 and 75 over years old). Longitudinal change (before starting AED, in 3 and 6 months after starting AED) of serum total cholesterol (TC), triglyceride (TRIG), HDL cholesterol (HDL-C), LDL cholesterol (LDL-C) and non-HDL cholesterol (non-HDL-C) were retrospectively analyzed using mixed models. The risk of change of lipid levels from normal range to abnormal range was also assessed by logistic regression analysis. Comparison between patients with EIAED use (EIAED group) and patients with non-EIAED use (non-EIAED group) revealed significant differences. non-EIAED group was set as reference. Differences in least square mean (LSM), 95 % confidence interval (CI) and P value in analysis of LDL-C and non-HDL-C levels (1 × 10) were as follows: 0.23 (0.10 ∼ 0.36), P < 0.001, 0.22 (0.09 ∼ 0.33), P = 0.001 in patients with age 65-74. In patients of age over 75, those were 0.08 (0.01 ∼ 0.15), P = 0.038, 0.17 (0.07 ∼ 0.26), P < 0.001, respectively. In patients with age 65-74, odds ratios (ORs) (95 % CI) in change of TC, LDL and non-HDL-C level from normal range to abnormal range were 32.28 (1.83-567.05), 48.43 (2.69-869.05), 12.04 (1.29-111.88), respectively. In patients with age 75 over, odds ratios (ORs) (95 % CI) in change of TC, LDL and non-HDL-C level from normal range to abnormal range were 46.02 (2.77-762.89), 5.53 (1.27-23.94), 2.38 (1.01-10.76), respectively. EIAED use had significant impact on changes in lipid levels in elderly patients. Furthermore, we could assess the impact of switching AED from EIAED to levetiracetam (LEV) in 36 patients including elderly. Switching AED from EIAED to LEV had significant impact in reducing TC, TRIG, LDL-C and non-HDL-C in both younger adult and elderly patients.

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