Seizure Medications: A Comprehensive Guide to Antiseizure Drugs

There is no single "best" seizure medication. Selection depends on seizure type, epilepsy syndrome, patient age, sex, comorbidities, drug interactions, side effect profile, and cost. Treatment is individualized by a neurologist/epileptologist.

Major Classes & Key Agents

Special Populations

• Women of childbearing potential: Avoid valproate (high teratogenicity); folate 1–4 mg; lamotrigine/levetiracetam preferred; monitor levels (LTG clearance ↑ in pregnancy).
• Elderly: Start low, go slow; avoid enzyme inducers (polypharmacy); LEV, LTG, LCM, BRV, GBP, PREG favored.
• Renal/hepatic impairment: Dose adjust (LEV, BRV, LCM, GBP, PREG renal; VPA, CBZ, LTG hepatic).

Management Principles

1. Monotherapy first; ~50% seizure-free on first drug, ~10–15% on second.
2. If 2 appropriate ASMs fail → drug-resistant epilepsy → refer to epilepsy center for surgery/diet/device evaluation.
3. Therapeutic drug monitoring for VPA, CBZ, PHT, PB, LTG (salivary).
4. Shared decision-making: discuss side effects, teratogenicity, cost, adherence.

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Class / Mechanism	Representative Drugs	Key Indications / Notes
Sodium Channel Blockers	Carbamazepine, Oxcarbazepine, Phenytoin, Lacosamide, Lamotrigine, Zonisamide, Rufinamide	Focal seizures, generalized tonic-clonic; CBZ/OXC: avoid in absence/myoclonic (can worsen); LTG: broad spectrum, slow titration (rash risk); LCM: IV option, cardiac monitoring
GABAergic	Valproate, Phenobarbital, Primidone, Tiagabine, Vigabatrin	VPA: broad spectrum (all types), teratogenic, weight gain, tremor; PB/PRM: sedation, tolerance, enzyme induction; VGB: visual field loss (restricted)
SV2A Binders	Levetiracetam, Brivaracetam	Broad spectrum, favorable kinetics, few interactions; LEV: behavioral side effects (irritability); BRV: more selective, less behavioral
AMPA Receptor Antagonist	Perampanel	Focal + generalized tonic-clonic; long half-life; psych side effects (aggression, suicidality)
Carbonic Anhydrase Inhibitors	Topiramate, Zonisamide	Broad; TPM: weight loss, cognitive effects, stones, glaucoma; ZNS: similar, less cognitive
T-type Calcium Channel	Ethosuximide	Specific for absence seizures (gold standard)
Benzodiazepines	Clonazepam, Clobazam, Diazepam, Midazolam, Lorazepam	Adjunctive; rescue; tolerance, sedation; CLB: less sedation, active metabolite
Novel / Newer	Cenobamate, Fenfluramine, Stiripentol, Cannabidiol (Epidiolex), Ganaxolone	Specific syndromes: Dravet (FEN, STI, CBD, GNX), LGS (CBD, GNX, CEN), focal (CEN)