1. Membrane Transporter/Ion Channel
  2. Sodium Channel
  3. Phenytoin

Phenytoin (Synonyms: 5,5-Diphenylhydantoin)

Cat. No.: HY-B0448 Purity: 99.91%
Handling Instructions

Phenytoin is an inactive voltage-gated sodium channel stabilizer.

For research use only. We do not sell to patients.

Phenytoin Chemical Structure

Phenytoin Chemical Structure

CAS No. : 57-41-0

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Free Sample (0.5-1 mg)   Apply now  
10 mM * 1 mL in DMSO USD 66 In-stock
Estimated Time of Arrival: December 31
1 g USD 60 In-stock
Estimated Time of Arrival: December 31
5 g USD 96 In-stock
Estimated Time of Arrival: December 31
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Other Forms of Phenytoin:

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Phenytoin is an inactive voltage-gated sodium channel stabilizer. Target: Sodium Channel Phenytoin is an antiepileptic drug. It is useful to treat partial seizures and generalized tonic-clonic seizures but not primary generalized seizures such as absence seizures or myoclonic seizures. Phenytoin is believed to protect against seizures by causing voltage-dependent block of voltage-gated sodium channels [1]. Phenytoin has low affinity for resting sodium channels at hyperpolarized membrane potentials [2]. When neurons are depolarized and the channels transition into the open and inactivated states, greater binding and block occur. The inhibitory potency is strongly use dependent, so that block accumulates with prolonged or repetitive activation, such as occurs during a seizure discharge. The blocking of sodium channels by phenytoin is of slow onset. The time course of fast sodium currents is therefore not altered in the presence of the drug and action potentials evoked by synaptic depolarizations of ordinary duration are not blocked. Thus phenytoin is able to selectively inhibit pathological hyperexcitability in epilepsy without unduly impairing ongoing activity. Phenytoin also blocks persistent sodium current and this may be of particular importance in seizure control. Phenytoin is a class 1b antiarrhythmic [3].

Clinical Trial
Molecular Weight









Room temperature in continental US; may vary elsewhere

Powder -20°C 3 years
  4°C 2 years
In solvent -80°C 6 months
  -20°C 1 month
Solvent & Solubility
In Vitro: 

DMSO : 100 mg/mL (396.40 mM; Need ultrasonic)

Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 3.9640 mL 19.8200 mL 39.6401 mL
5 mM 0.7928 mL 3.9640 mL 7.9280 mL
10 mM 0.3964 mL 1.9820 mL 3.9640 mL
*Please refer to the solubility information to select the appropriate solvent.
In Vivo:
  • 1.

    Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% saline

    Solubility: ≥ 2.5 mg/mL (9.91 mM); Clear solution

  • 2.

    Add each solvent one by one:  10% DMSO    90% corn oil

    Solubility: ≥ 2.5 mg/mL (9.91 mM); Clear solution

*All of the co-solvents are provided by MCE.
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