Description
Eptoheal (Phenytoin Sodium) 100 mg
Eptoheal 100 mg is identified as a phenytoin sodium product. Phenytoin is a long-established anti-seizure medicine used in the management of certain epileptic seizure disorders. Because brand names can vary by market, the active ingredient should be verified against the local prescribing information before use.
Active Ingredient and Medicine Class
The verified active ingredient is phenytoin sodium, a hydantoin anticonvulsant and voltage-gated sodium channel blocker. It has a narrow therapeutic index and clinically important interaction potential.
Established Medical Uses
Official prescribing information for phenytoin sodium products identifies use in the treatment of tonic-clonic seizures and psychomotor seizures. FDA labeling also notes that phenytoin is not effective for absence (petit mal) seizures and is not indicated for seizures due to metabolic causes such as hypoglycaemia.
How It Works
Phenytoin stabilises excitable nerve membranes by reducing the repetitive firing of neurons. Its main antiseizure effect is generally attributed to blockade of voltage-gated sodium channels, which helps limit the spread of seizure activity in the brain.
Important Safety Information
Phenytoin should not be used in people with a known hypersensitivity to phenytoin, other hydantoins, or product ingredients, and it is contraindicated in patients with a history of prior acute liver injury caused by phenytoin. It is also contraindicated with delavirdine in FDA labeling. Abrupt withdrawal may precipitate seizures, so changes in therapy are generally made gradually. Important precautions include suicidal thoughts or behaviour, serious skin reactions, liver toxicity, and clinically significant drug interactions because phenytoin affects and is affected by many other medicines.
Possible Side Effects
Common adverse effects include nystagmus, drowsiness, slurred speech, ataxia, poor coordination, and confusion. Important serious reactions include rash and severe cutaneous adverse reactions, blood disorders, liver problems, hyperglycaemia, gum overgrowth, and toxicity affecting the brain, including delirium or encephalopathy.
Scientific Evidence
Peer-reviewed reviews support phenytoin as a longstanding antiseizure medicine with established efficacy in epilepsy, particularly for tonic-clonic seizure control. The literature also emphasises its narrow therapeutic range, variable pharmacokinetics, and the need to consider adverse effects and drug interactions carefully.
Medical Information Notice
This summary is provided for educational purposes only and is based on sources available at the time of review. It does not replace the official patient leaflet, prescribing information, or assessment by a qualified healthcare professional.
Medical Sources
- FDA — Dilantin (extended phenytoin sodium capsules) Prescribing Information
- DailyMed — Extended Phenytoin Sodium Capsules, Full Prescribing Information
- G. Tunnicliff, et al. — Basis of the antiseizure action of phenytoin. Gen Pharmacol. 1996.
- Kuca K, et al. — Phenytoin – An anti-seizure drug: Overview of its chemistry, pharmacology and toxicology. Food and Chemical Toxicology. 2020.