Mephenytoin is a hydantoin anticonvulsant and a methylated derivative of phenytoin. It has been used as an antiepileptic medicine for the management of certain seizure disorders.
Mephenytoin acts primarily by reducing excessive neuronal excitability through effects on voltage-gated sodium channels. Its anticonvulsant activity helps stabilize neuronal membranes and reduce the propagation of abnormal electrical activity in the brain.
Mephenytoin has the molecular formula C12H14N2O2 and a molecular weight of approximately 218.26 g/mol. Its CAS Number is 50-12-4.
It belongs to the hydantoin derivative chemical class and is structurally related to phenytoin. Mephenytoin is metabolized to active and inactive metabolites, with its pharmacological properties differing from those of phenytoin.
Mephenytoin exerts anticonvulsant activity primarily through modulation of voltage-gated sodium channels.
By limiting sustained repetitive neuronal firing, it helps reduce the spread of abnormal electrical discharges associated with seizures.
Mephenytoin has historically been used as an anticonvulsant/antiepileptic agent, particularly for selected seizure disorders.
Its pharmaceutical applications include:
Its availability and approved clinical use may vary according to regulatory jurisdiction.
Mephenytoin API can be evaluated using validated analytical methods for identity, assay, related substances, water content, residual solvents, elemental impurities and other applicable quality attributes.
HPLC, infrared spectroscopy and other validated analytical techniques may be used for identity, assay and impurity determination. Where stereochemical purity is relevant, appropriate chiral analytical procedures may also be applied.
Final acceptance criteria should follow the applicable manufacturer's approved drug-substance specification and Certificate of Analysis.
Mephenytoin should be stored in a tightly closed pharmaceutical-grade container under controlled conditions and protected from excessive heat, moisture and direct light.
Specific storage and transportation conditions should follow the manufacturer's approved specification.
Mephenytoin API may be supplied for qualified pharmaceutical manufacturing, formulation development, analytical and research applications, subject to applicable regulatory and quality requirements.
Mephenytoin API is available for qualified pharmaceutical development and manufacturing requirements. Customers can request product specifications, Certificate of Analysis, analytical documentation, packaging information and commercial details according to their requirements.
| Parameter | Specification |
|---|---|
| Appearance | White to off-white crystalline powder |
| Identification | IR & HPLC compliant |
| Assay (HPLC) | 98.0% – 102.0% |
| Loss on Drying | NMT 1.0% |
| Residue on Ignition | NMT 0.2% |
| Individual Impurity | NMT 1.0% |
| Total Impurities | NMT 2.0% |
| Water Content | NMT 1.0% |