Lamotrigine-induced Rash: Can We Stop Worrying?

Abstract

Lamotrigine-induced Rash: Worth a Rechallenge P-Codrea Tigaran S, Sidenius P, Dam M Acta Neurol Scand 2005;111:191–194 Purpose The only serious adverse event associated with lamotrigine (LTG) treatment is a hypersensitivity reaction primarily occurring as a rash. Despite this concern, LTG is an antiepileptic drug (AED) with one of the most favorable efficacy/tolerability ratios compared with the new as well as the old AEDs. Thus, this study aimed to evaluate the results of rechallenge with LTG after the initial rash. Methods In total, 688 patients (350 as monotherapy, and 338 as add-on therapy) with either idiopathic generalized epilepsy or focal epilepsy were treated with LTG. The patients with LTG-induced rash were rechallenged with LTG. The dosage schedule was 5 mg every day or every second day for 14 days, increased by 5 mg every 14th day to 25 mg/day. After achieving the daily dosage of 25 mg/day, the uptitration was completed by following the current guidelines. Results In 52 patients, a rash developed. The LTG-induced rash occurred in 6%, whereas 12 (1.8%) developed a rash shown to be coincidentally associated with the initiation of LTG therapy. In their cases, LTG was continued with success without intermission. Nineteen (38%) of the initial cohort were rechallenged with LTG, with a success rate of 84%. Conclusions This study is the first to provide a successful recipe verified in time for the rechallenge with LTG after the initial drug-induced rash. The concurrent use of valproate was not found in this study to represent an additional risk factor for the occurrence of the rash during rechallenge with LTG. Our results agree with previous findings that women are more likely to develop the rash ( P < 0.009).