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Active ingredient: Ethosuximide - Brands, Medical Use, Clinical Data

Brands, Medical Use, Clinical Data

Drug Category

  • Anticonvulsants
  • Succinimides

Dosage Forms

  • Syrup

Brands / Synonyms

Aethosuximide; Asamid; Atysmal; Capitus; Emeside; Epileo Petit Mal; Ethosuccimide; Ethosuccinimide; Ethosuxide; Ethymal; Etomal; Etosuximid; Etosuximida; Mesentol; Pemal; Pemalin; Pentinimid; Peptinimid; Petinimid; Petnidan; Piknolepsin; Pyknolepsinum; Ronton; Simatin; Succimal; Succimitin; Suxilep; Suximal; Suxin; Suxinutin; Thetamid; Thilopemal; Uritone; Urodeine; Zaraondan; Zarodan; Zarondan; Zarondan-Saft; Zarontin; Zartalin


For the treatment of petit mal epilepsy.


Used in the treatment of epilepsy. Ethosuximide suppresses the paroxysmal three cycle per second spike and wave activity associated with lapses of consciousness which is common in absence (petit mal) seizures. The frequency of epileptiform attacks is reduced, apparently by depression of the motor cortex and elevation of the threshold of the central nervous system to convulsive stimuli.

Mechanism of Action

Binds to T-type voltage sensitive calcium channels. Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death. The isoform alpha-1G gives rise to T-type calcium currents. T-type calcium channels belong to the "low-voltage activated (LVA)" group and are strongly blocked by mibefradil. A particularity of this type of channels is an opening at quite negative potentials and a voltage-dependent inactivation. T-type channels serve pacemaking functions in both central neurons and cardiac nodal cells and support calcium signaling in secretory cells and vascular smooth muscle. They may also be involved in the modulation of firing patterns of neurons which is important for information processing as well as in cell growth processes.


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Biotrnasformation / Drug Metabolism

Not Available


Ethosuximide should not be used in patients with a history of hypersensitivity to succinimides.

Drug Interactions

Since Zarontin (ethosuximide) may interact with concurrently administered antiepileptic drugs, periodic serum level determinations of these drugs may be necessary (eg, ethosuximide may elevate phenytoin serum levels and valproic acid has been reported to both increase and decrease ethosuximide levels).

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