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Retigabine is a new antiepileptic drug. Its mechanism of action involves activation of voltage gated potassium channel (Kv7, KCNQ). Epilepsy is a disease of chronic nature and may be associated with other diseases that need therapy with other drugs as NSAIDs like diclofenac. Purpose. The current work is designed to study the spectrum of retigabine and diclofenac, on acute seizures in albino mice; also, it investigated the possible interactions between retigabine and diclofenac regarding their anticonvulsant activities and the role of KCNQ channel. Method. Convulsions were induced in mice using the picrotoxin model, the pilocarpine-induced-status epilepticus model, and lastly the maximal electroshock model. Results. The study revealed that combined administration of retigabine and diclofenac significantly increased percentage of protection from convulsions induced by picrotoxin model and MES test. Furthermore, the combination significantly prolonged the mean latency period of convulsion in pilocarpine-induced sustained epilepsy model. Conclusion. we concluded that retigabine has a broad spectrum antiepileptic effect and diclofenac potentiated retigabine action as an opener of potassium (KCNQ2/3) channels.

Diclofenac Influence on the Anticonvulsant Effect of Retigabine: The Potential Role of KCNQ Channels