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Pharmacology · Agents Used in Psychiatry and Neurology

Classification of Antiepileptic Drugs

Remedia antiepileptica

Modern antiepetlic drugs are classified according to which pathogenetic link they target. The main goal of therapy comes down to two global processes: either suppressing excessive neuronal excitation or stimulating the natural inhibitory mechanisms of the brain.

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Classification criterionDrugs are grouped strictly by their effect on a specific pathogenetic link
GABAergicEnhance inhibitory processes in the central nervous system
CombinedCombine multiple mechanisms of action simultaneously for maximum effect
2 min readFor medical studentsUpdated 09/24/2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesReviewed by medical editor: Aulov A. A., general practitioner · 09/24/2026

Drugs that reduce neuronal excitability (channel blockers)

To prevent a neuron from generating pathological impulses, it is necessary to restrict the influx of ions responsible for membrane depolarization. Drugs that block ion channels are used for this purpose.

Voltage-gated sodium channel blockers These agents directly reduce the excitability of nerve cell membranes by preventing the inward sodium current. This group includes:

  • Phenytoin
  • Carbamazepine
  • Lamotrigine

T-type calcium channel blockers This group selectively blocks low-threshold calcium channels located in neurons. A typical and the only representative indicated in this classification is Ethosuximide.

Agents that enhance GABAergic inhibition

Gamma-aminobutyric acid (GABA) is the main inhibitory neurotransmitter in the CNS. Drugs in this large group increase the efficiency of inhibitory processes, suppressing epileptic activity. The group is traditionally divided into three important subcategories:

  1. Barbiturates and their derivatives. Classical drugs, which include Phenobarbital, Benzobarbital, and Primidone.
  2. Benzodiazepines. Widely known agents such as Diazepam, Clonazepam, and Lorazepam.
  3. Drugs affecting GABA metabolism and uptake. They work directly with the neurotransmitter's turnover cycle. These include Vigabatrin, Tiagabine, and Gabapentin.
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Inhibition of excitatory amino acids and combined action

In addition to GABA, there are excitatory neurotransmitters in the brain—primarily glutamate and aspartate.

Agents inhibiting the action of excitatory amino acids These drugs block the effects of excitatory neurotransmitters, preventing the excessive activation of neuronal networks. A prominent representative of the group is Felbamate.

Agents with a combined mechanism of action Some molecules are so versatile that they combine several of the aforementioned pharmacological effects at once (e.g., affecting both ion channels and GABA). Such complex drugs include:

  • Valproic acid
  • Topiramate

Briefly: answers to topical questions

What is the exact mechanism of action of valproic acid?

  • Sodium channel blockade (sodium channels) — reduces neuronal excitability directly within the epileptogenic focus.
  • Effect on the GABA system (GABA) — inhibits catabolism by blocking GABA transaminase and stimulates synthesis by increasing glutamate decarboxylase activity.
  • Calcium channel blockade (T-type calcium channels) — specifically blocks T-type channels.
How to memorize

To recall the main mechanisms, remember the phrase: "Sodium, Calcium, GABA, Glutamate — epilepsy's not welcome here!". Meanwhile, Valproic acid and Topiramate work "for everyone" at once.

Class and exam questions

What principle is the presented classification based on?

The classification is based on which pathogenetic link a specific drug targets.

What is the action of sodium channel blockers?

They reduce the excitability of neuronal cell membranes, preventing the spread of the pathological impulse.

Which drugs block T-type calcium channels?

This group includes Ethosuximide, which blocks low-threshold calcium channels in neurons.

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What else to study on this topic

  • Mechanism of voltage-gated sodium channel blockade (Phenytoin, Carbamazepine)
  • Differences in the action of barbiturates and benzodiazepines on GABA receptors
  • Features of GABA metabolism and reuptake (Vigabatrin, Tiagabine)
  • The role of glutamate and aspartate in the pathogenesis of epilepsy
  • Advantages of drugs with a combined mechanism of action (Valproic acid)

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Other topics in the section "Agents Used in Psychiatry and Neurology"

Hypnotic benzodiazepinesPharmacology of benzodiazepinesNitrazepamHypnotic benzodiazepines (Flunitrazepam, Triazolam, Midazolam)Z-drugs (non-benzodiazepine hypnotics)H1-histamine receptor blockers (hypnotics)Melatonin receptor agonistsBarbiturates (Hypnotics)Phenobarbital and CyclobarbitalBarbiturate poisoningAliphatic hypnotics (Chloral hydrate, Clomethiazole)Epilepsy (pathogenesis and types of seizures)
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