Assertion: phenytoin's effect | /r/CapableOf | prevent repetitive neuronal firing
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text: Phenytoin is an antiepileptic drug with several pharmacologic actions, including ion conductance, Na-K ATPase activity, synaptic transmission, and neurotransmitter release; the antiepileptic effects of phenytoin are thought to be primarily related to its action at the sodium channels during depolarization, preventing repetitive neuronal firing.