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Gabapentin and lamotrigine in Indian patients of partial epilepsy refractory to carbamazepine.

52 patients (25 males and 27 females) suffering from refrectory partial seizures, of not more than two years duration and on carbamazepine monotherapy were enrolled in this study. Patients were randomly put on gabapentin (19 males and 8 females) or lamotrigine (6 males and 19 females) as add on therapy. The efficacy of the drugs was assessed by the seizure frequency, pattern of seizures and seizure free interval. The safety was evaluated from the biochemical investigations and the adverse effects observed or reported by the patients during the course of the study. The average frequency of basal partial seizures was 6.26+3.86 and 5.04+2.47 which decreased significantly (p<. 001) after 12 weeks of add on therapy to 1.75+2.16. and 1.68+2.94 in the GBP and LTG group respectively. However, there was no significant difference between the two drugs after 12 weeks of add on therapy. The PCB (primary change in basal seizure frequency) values decreased to -72+34.92 and -76.22+29.68 in the GBP and LTG group respectively. The difference in these two groups was not significant. The responder rate was 77.7% and 92% respectively in GBP and LTG group respectively. GBP was found to be more effective in partial seizures with secondarily generalization while LTG was effective in all subtypes of partial seizures. The abnormal scalp EEG was recorded in 33.3% (9 of 27 patients) in GBP group and 40 %( 10 of 25 patients) in LTG group and it did not revert to normal in 33.3% and 40% of patients in either of groups (GBP/LTG). Minor side effects which were self limiting were noticed in 80% in groups I and 74% were groups II.