system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which one of the following statements about phenytoin is accurate?
assistant
The correct answer is  high frequency discharges are inhibited with little effect on normal low frequency discharges which allow Na+ channels to recover even when inactivation is prolonged. This effect has been noted at therapeutic concentration of phenytoin, while other effects like reduction in Ca2+ influx, inhibition of glutamate and facilitation of GABA responses have been demonstrated at higher I toxic concentrations. Intracellular accumulation of Na+ that occurs during repetitive firing is prevented. REF KD TRIPATHI 8TH ED.