• #LGM Pharma is a Phenytoin CAS# 57-41-0 API supplier distributor based in the USA. Inquire about DMF, cGMP, price, availability, delivery, purity, and more.
  • #Questions? Call our customer API support number 1-(800)-881-8210.
  • #LGM Pharma offers this active ingredient but not the finished dosage forms.

Product Details:

  • CAS No: 57-41-0
  • AHFC code: 28:12.1
  • Synonyms: 5,5-diphenylhydantoin 5,5-Dwufenylohydantoina Difenilhidantoina [Spanish] Dihydantoin Diphenylan Sodium Diphenylhydantoin Diphenylhydantoine [French] Diphenylhydatanoin Fenitoina [INN-Spanish] Phenytoin Sodium Phenytoine Phenytoine [INN-French] Phenytoinum [INN-Latin]
  • ATC Code: N03AB02 N03AB04 N03AB05
  • Chemical Formula: C10H16Br2N2O2
  • Molecular Weight: 252.268
  • Assay/Purity: Typically NLT 98%
  • DrugBank: DB00252 (APRD00241)
  • SMILES: O=C1NC(=O)C(N1)(C1=CC=CC=C1)C1=CC=CC=C1
  • PubChem:
  • IUPAC: 5,5-diphenylimidazolidine-2,4-dione

Additional Details

For the control of generalized tonic-clonic (grand mal) and complex partial (psychomotor, temporal lobe) seizures and prevention and treatment of seizures occurring during or following neurosurgery.
Phenytoin is an antiepileptic drug which can be useful in the treatment of epilepsy. The primary site of action appears to be the motor cortex where spread of seizure activity is inhibited. Phenytoin reduces the maximal activity of brain stem centers responsible for the tonic phase of tonic-clonic (grand mal) seizures. Phenytoin acts to dampen the unwanted, runaway brain activity seen in seizure by reducing electrical conductance among brain cells. It lacks the sedation effects associated with phenobarbital. There are some indications that phenytoin has other effects, including anxiety control and mood stabilization, although it has never been approved for those purposes by the FDA. Phenytoin is primarily metabolized by CYP2C9.
Mode of Action:
Phenytoin acts on sodium channels on the neuronal cell membrane, limiting the spread of seizure activity and reducing seizure propagation. By promoting sodium efflux from neurons, phenytoin tends to stabilize the threshold against hyperexcitability caused by excessive stimulation or environmental changes capable of reducing membrane sodium gradient. This includes the reduction of post-tetanic potentiation at synapses. Loss of post-tetanic potentiation prevents cortical seizure foci from detonating adjacent cortical areas.
Primarily hepatic
Oral, mouse: LD50 = 150 mg/kg; Oral, rat: LD50 = 1635 mg/kg. Symptoms of overdose include coma, difficulty in pronouncing words correctly, involuntary eye movement, lack of muscle coordination, low blood pressure, nausea, sluggishness, slurred speech, tremors, and vomiting.
General Reference:
Products currently covered by valid US Patents are offered for R&D use in accordance with 35 USC 271(e)+A13(1). Any patent infringement and resulting liability is solely at buyer risk.

API’s From Quality Manufacturers:

  • Cost effective materials based on specific requirements
  • Small quantities for initial research and larger development quantities towards product commercialization


  • Technical packages, letters of access to filed DMFs
  • Complete assistance in any regulatory filings
  • Top quality GMP certified manufacturers
  • Have necessary regulatory credentials