Phenytoin

Anti-epileptic
PRESCRIPTION ONLY IN INDIA

Phenytoin is a anti-epileptic found in 1 medicine sold in India, such as Eptoin 100. Below: what it is for, how it works, how to take it, side effects, interactions and pregnancy advice.

What it is used for

Prevents seizures.

How it works

An older anti-epileptic for many seizure types, with a narrow safe range and many interactions.

How to take it

Take at the same time daily; blood levels are checked. Do not switch brands without advice.

Common side effects

  • Gum overgrowth
  • Unsteadiness
  • Drowsiness
  • Coarse facial features and body hair with long use

Get medical help straight away if

  • Unsteadiness, double vision or slurred speech (level too high)
  • Severe rash with fever

Be careful

Narrow safe range: blood tests may be needed; can cause gum swelling.

Other medicines and interactions

Very many interactions: it lowers levels of hormonal contraceptives, warfarin, steroids and many others; fluconazole, isoniazid and others raise its level.

Pregnancy and breastfeeding

Plan pregnancy with your neurologist and take folic acid; some anti-epileptics carry higher birth-defect risks. Never stop suddenly. Ask about breastfeeding.

Brands of Phenytoin (1)

Eptoin 100

Common questions

What is Phenytoin used for?

Prevents seizures.

How does Phenytoin work?

An older anti-epileptic for many seizure types, with a narrow safe range and many interactions.

How should I take Phenytoin?

Take at the same time daily; blood levels are checked. Do not switch brands without advice.

What are the side effects of Phenytoin?

Common: Gum overgrowth, unsteadiness, drowsiness, coarse facial features and body hair with long use. Get help straight away for: Unsteadiness, double vision or slurred speech (level too high), severe rash with fever.

Does Phenytoin interact with other medicines?

Very many interactions: it lowers levels of hormonal contraceptives, warfarin, steroids and many others; fluconazole, isoniazid and others raise its level.

Is Phenytoin safe in pregnancy and breastfeeding?

Plan pregnancy with your neurologist and take folic acid; some anti-epileptics carry higher birth-defect risks. Never stop suddenly. Ask about breastfeeding.

Does Phenytoin need a prescription in India?

Yes. In India it is a prescription (Schedule H) medicine, so a pharmacist should sell it only with a doctor's prescription.

Which brands contain Phenytoin?

Eptoin 100.

Sources and further reading

NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.

Last reviewed 31 October 2026. Written by Satya Babu from standard prescribing information.

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For information only, not medical advice. This page is a plain-language summary written from standard prescribing information and the public guides linked below. Brands sometimes change their formula, so always check the composition printed on the pack. Doses here are typical adult doses; yours may differ. Do not start, stop or change a medicine without your doctor or pharmacist, and keep all medicines away from children. In an emergency, call 112 (India) or your local emergency number.