Chapter 14: Antiepileptic Drugs

The chapter systematically presents major drug classes organized by chemical structure and historical development, including barbiturates such as phenobarbital and primidone, hydantoins like phenytoin and fosphenytoin, iminostilbenes including carbamazepine and oxcarbazepine, succinimides represented by ethosuximide, and valproic acid formulations. Newer generation agents such as gabapentin, pregabalin, lamotrigine, levetiracetam, and topiramate are discussed with emphasis on improved safety profiles and reduced drug interaction potential. The chapter details four primary mechanisms of action by which these drugs achieve seizure suppression: voltage-dependent sodium channel blockade that prevents repetitive neuronal firing, calcium channel modulation affecting neurotransmitter release, enhancement of inhibitory GABA neurotransmission, and reduction of excitatory glutamate activity. Beyond seizure management, the chapter addresses off-label clinical applications in neuropathic pain syndromes, bipolar disorder treatment, and migraine prophylaxis. Critical safety considerations receive substantial coverage, including teratogenic potential and fetal complications, narrow therapeutic windows requiring careful dosing, complex drug-drug interactions affecting metabolism, and serious adverse effects such as hepatotoxicity, bone marrow suppression, and Stevens-Johnson syndrome. The nursing practice section emphasizes baseline neurological assessment protocols, therapeutic drug monitoring through serum level testing, maintenance of detailed seizure diaries for treatment evaluation, and comprehensive patient education regarding medication adherence, withdrawal precautions, and lifestyle modifications essential for optimal therapeutic outcomes.