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compositionComposition:PHENYTOIN-300MG
prescription
Prescription Medicine
info
Eripin 300 Tablet ER

Eripin 300 Tablet ER is used to treat epilepsy/seizures, and prevent seizures during/after brain surgery or after traumatic brain injury. Besides this, it may also be used to treat trigeminal neuralgia (facial nerve pain). It contains Phenytoin, which helps prevent neurons from working at a very fast speed, thereby preventing the brain cells from firing together rapidly in an uncontrolled way. As a result, it helps control seizures. In some cases, it may cause certain common side effects such as weakness, drowsiness, dizziness, confusion, restlessness, slurred speech, constipation, loss of coordination, and abnormal eye movement. Before taking this medicine, inform your doctor if you are allergic to any of its components or if you are pregnant/breastfeeding, and about all the medications you are taking and any pre-existing medical conditions.

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Written By Santoshini Reddy G , M Pharmacy
Reviewed By Bayyarapu Mahesh Kumar , M Pharmacy
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More about the Product

Composition :

PHENYTOIN-300MG

Consume Type :

Oral

Expires on or after :

Dec-28

Return Policy :

Not Returnable

About Eripin 300 Tablet ER

Eripin 300 Tablet ER is a prescription medicine used to control and prevent certain types of seizures. It is primarily prescribed for people who experience generalised tonic-clonic seizures and psychomotor seizures. It is also used to prevent and treat seizures that may happen during or after brain surgery.

To get the most benefit, you must take Eripin 300 Tablet ER consistently at the same times every day as directed by your doctor. You can take this medicine with or without food, but it is best to choose one way and stick to it with every dose to keep medicine levels steady in your body. Making healthy lifestyle choices, such as maintaining a regular sleep schedule and avoiding seizure triggers, can also support your treatment.

While taking Eripin 300 Tablet ER, you may experience mild side effects like drowsiness, dizziness, or mild gum swelling. However, if you notice severe skin rashes, swollen glands, yellowing of your eyes or skin, or changes in your mood, you must contact your healthcare provider immediately. Regular dental checkups are also important to manage any gum changes that may occur.

Before starting Eripin 300 Tablet ER, talk to your doctor if you have a history of liver problems, kidney disease, diabetes, or depression. Do not take this medicine if you have had a severe allergic reaction to it or similar seizure medicines in the past, or if you have a history of liver damage caused by this medication.

This medicine can interact with alcohol, which can change the amount of the drug in your body and increase drowsiness, and smoking may also affect how it works. It can also interact with many other prescription medications, potentially making them less effective or increasing your risk of side effects. If you are pregnant, planning to become pregnant, breastfeeding, or are an older adult, consult your doctor to discuss the risks and benefits before taking Eripin 300 Tablet ER.

Uses of Eripin 300 Tablet ER

Eripin 300 Tablet ER is used to control and prevent certain types of seizures by stabilising abnormal electrical activity in the brain. The detailed uses of Eripin 300 Tablet ER are as follows: 

  • Tonic-clonic seizures: Eripin 300 Tablet ER helps control and reduce the frequency of these generalised seizures by stabilising electrical activity in the brain.
  • Psychomotor (temporal lobe) seizures: Eripin 300 Tablet ER works to prevent these focal seizures, helping you maintain control over your movements and awareness.
  • Seizures during or after neurosurgery: Eripin 300 Tablet ER is used to prevent the onset of sudden seizures that can occur as a complication of brain surgery.

Key Benefits

Eripin 300 Tablet ER helps prevent and control seizures by stabilising electrical activity in the brain. The key benefits of Eripin 300 Tablet ER include: 

  • Reduces Seizure Frequency: Helps lower the frequency of seizures by maintaining stable electrical activity in the brain.
  • Controls Seizure Severity: May help reduce the severity of seizure episodes, allowing for greater confidence in daily activities.
  • Provides Post-Surgical Seizure Protection: Helps protect against seizures that may occur following brain surgery, supporting a safer recovery process.
  • Maintains Continuous Seizure Control: When taken regularly, it helps maintain consistent levels of protection against unexpected seizures.
  • Supports Daily Independence: By reducing the risk of unpredictable seizure episodes, it may help improve quality of life and support routine daily activities.

Directions for Use

Follow these steps to get the maximum benefit from treatment with Eripin 300 Tablet ER safely and effectively:

  • Swallow the tablet or capsule whole with a full glass of water. Do not crush, chew, or break it unless specifically instructed by your doctor.
  • If you are taking the liquid form, shake the bottle well before each dose and use a marked medical measuring spoon or syringe to get the exact amount.
  • Take your dose at the same times every day to keep a constant level of medicine in your bloodstream.
  • You can take this medicine with or without food, but be consistent with your choice.

Always follow your doctor's exact instructions regarding how and when to take your medication. Do not change your dose or stop taking it suddenly without consulting your healthcare provider first.

How Eripin 300 Tablet ER Works

Phenytoin, the main component of Eripin 300 Tablet ER, works by targeting the electrical pathways in the brain. Seizures occur when there is a sudden, uncontrolled burst of electrical activity among brain cells. This medicine acts on specific gates on the surface of these brain cells, known as sodium channels. By temporarily blocking these channels, it slows down rapid and excessive electrical impulses. This stabilising effect prevents the chaotic electrical signals from spreading to other parts of the brain. As a result, the brain's activity remains balanced, which significantly lowers the likelihood of a seizure starting or spreading.
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Alcohol

Unsafe

Avoid alcohol consumption while taking Eripin 300 Tablet ER, as it may increase/decrease your blood levels of this medication and cause unpleasant side effects.

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Pregnancy

Caution

Do not take Eripin 300 Tablet ER if you are pregnant unless prescribed by the doctor. Your doctor will prescribe Eripin 300 Tablet ER only if the benefits outweigh the risks. If you become pregnant while taking Eripin 300 Tablet ER, then do not stop taking Eripin 300 Tablet ER without consulting your doctor.

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Breast Feeding

Caution

Please consult your doctor before taking Eripin 300 Tablet ER if you are breastfeeding. Your doctor will decide whether Eripin 300 Tablet ER can be given to breastfeeding mothers or not.

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Driving

Unsafe

Eripin 300 Tablet ER may cause dizziness and drowsiness. Therefore, avoid driving and operating machinery until you are mentally alert.

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Liver

Caution

Dose adjustment may be needed. Eripin 300 Tablet ER should be used with caution in patients with liver impairment/liver disease. Please consult your doctor if you have liver impairment or any concerns regarding this.

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Kidney

Caution

Dose adjustment may be needed. Eripin 300 Tablet ER should be used with caution in patients with kidney impairment/kidney disease. Please consult your doctor if you have kidney impairment or any concerns regarding this.

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Children

Safe if prescribed

Eripin 300 Tablet ER should be given to children only if prescribed by a doctor.

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Heart

Consult your doctor

Please consult your doctor before using Eripin 300 Tablet ER if you have pre-existing heart problems.

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Geriatrics

Consult your doctor

Limited information is available for use in erderly patients. Please consult your doctor.

What if I have taken an overdose of Eripin 300 Tablet ER

Do not take more than the prescribed dose of Eripin 300 Tablet ER, as it may cause an overdose, which can be fatal. The symptoms of an overdose include slurred speech, twitching eye movements, muscle stiffness or weakness, tremor, loss of balance, lightheadedness, fainting, vomiting, nausea, and slow or shallow breathing. If you suspect you have taken an overdose or notice signs of overdose, please consult a doctor immediately.

Diet & Lifestyle Advise

  • Practice excellent oral hygiene: Because this medicine can cause gum swelling, brush your teeth at least twice a day, floss daily, and visit your dentist regularly to keep your gums healthy.
  • Get adequate sleep: Lack of sleep is a well-known seizure trigger. Aim for 7 to 9 hours of quality sleep every night to support your treatment plan.
  • Monitor your vitamin levels: This medication can sometimes lower your body's levels of calcium and vitamin D. Ask your doctor if you should eat more calcium-rich foods like yoghurt and leafy greens, or if you need a supplement.
  • Limit or avoid alcohol: Drinking alcohol can unpredictably change the levels of this medicine in your blood, increasing your risk of seizures or severe side effects like extreme drowsiness.

Have a query?

How Soon It Starts Working

The time required for Eripin 300 Tablet ER to start to work: Eripin 300 Tablet ER ideally shows its action within 1.5 to 3 hours after administration. The time for which the effects of Eripin 300 Tablet ER last: The effect of Eripin 300 Tablet ER lasts for 2 to 3 days.

What if you forget to take Eripin 300 Tablet ER

If you miss a dose, take it as soon as you remember. If it is almost time for the next dose, skip the missed dose and take the next dose at your regular scheduled. Never take a double dose to make up for the missed one.

Storage

• Store Eripin 300 Tablet ER at room temperature, ideally between 68°F and 77°F (20°C to 25°C). • Keep the medication in its original container, tightly closed, to protect it from light and moisture.

Drug Warnings

  • Do not stop taking this medicine suddenly: Stopping abruptly can trigger severe, continuous seizures. Any reduction in your dose must be done under your doctor's close supervision.
  • Get regular blood tests: Your doctor will need to check your blood regularly to ensure the medicine stays within a safe and effective range.
  • Be careful when driving: This medicine can cause drowsiness and dizziness. Avoid driving or operating machinery until you know exactly how it affects you.
  • Check for skin changes: Watch closely for any new skin rashes, especially during the first few weeks of treatment, and report them to your doctor immediately.
  • Alert other healthcare providers: Always tell your dentist, surgeon, and any other doctors you see that you are taking Eripin 300 Tablet ER, as it can affect other treatments and surgeries.

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Drug-Drug Interactions

Inform your doctor if you are taking any of the following medicines, as they may interact with Eripin 300 Tablet ER: 

  • Antacids and calcium supplements: Can reduce the absorption of Eripin 300 Tablet ER if taken at the same time. Space them at least 2 hours apart.
  • Blood thinners (like warfarin): Eripin 300 Tablet ER can change how these medicines work, increasing the risk of bleeding or blood clots.
  • Birth control pills: This medicine can make hormonal contraceptives less effective, increasing the risk of unplanned pregnancy.
  • Other seizure medicines: Can unpredictably raise or lower the level of Eripin 300 Tablet ER in your body.


Drug-Food Interactions

  • Enteral feeds (tube feeding): Can significantly lower the absorption of Eripin 300 Tablet ER. Feedings should be paused for a period before and after taking this medicine as directed by your healthcare team.


Drug-Disease Interactions

Inform your doctor if you have a history of the following conditions before taking Eripin 300 Tablet ER, as it may worsen your condition or require closer monitoring: 

  • Liver disease: Your body breaks down this medicine through the liver. If you have liver damage, the drug can build up to dangerous levels.
  • Diabetes: This medicine may raise your blood sugar levels, requiring adjustments to your diabetes medications.
  • Porphyria: Do not take this medicine if you have this rare metabolic disorder, as it can worsen the condition.

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All Substitutes & Brand Comparisons

Habit Forming

No

Therapeutic Class

[ANTICONVULSANT]

FAQs

Eripin 300 Tablet ER is used to treat epilepsy/seizures and prevent seizures during/after brain surgery or after traumatic brain injury. Besides this, Eripin 300 Tablet ER may also be used to treat trigeminal neuralgia (facial nerve pain).
Eripin 300 Tablet ER contains Phenytoin (an anticonvulsant), which helps prevent neurons from working at a very fast speed, thereby preventing the brain cells from firing together rapidly in an uncontrolled way. As a result, Eripin 300 Tablet ER controls the overactivity of the brain cells that cause seizures. Eripin 300 Tablet ER slows down the electrical impulses in the nerves and reduces their ability to transmit pain, thereby treating trigeminal neuralgia.
Eripin 300 Tablet ER can make birth control pills less effective. Talk to your doctor about using non-hormonal contraceptives like condoms and a diaphragm with spermicide to prevent pregnancy.
Please do not stop taking Eripin 300 Tablet ER without consulting your doctor, as it may cause increased seizures. Continue taking Eripin 300 Tablet ER for as long as your doctor has prescribed it to you. Do not hesitate to consult your doctor if you experience any difficulties while taking Eripin 300 Tablet ER.
Yes, Eripin 300 Tablet ER may cause swelling in the gums. Brush and floss your teeth daily; visit your dentist if you experience this problem regularly.
Eripin 300 Tablet ER may affect the breakdown of the blood sugar/glucose and may prevent the release of insulin, thereby leading to high blood sugar. So, contact a doctor before using Eripin 300 Tablet ER if you have diabetes.
A seizure generally lasts from a few seconds to a few minutes, depending on the type of seizure.
Take Eripin 300 Tablet ER with or without food, as advised by your doctor.
You are recommended to avoid alcohol consumption while taking Eripin 300 Tablet ER as it may cause increased side effects.
Eripin 300 Tablet ER may stay in our system (body) for 5 to 6 days on average. This duration is different for each person. In some cases, it may remain for about 9 to 10 days.
Eripin 300 Tablet ER overdose can be fatal and may cause symptoms such as slurred speech, twitching eye movements, muscle stiffness or weakness, tremors, loss of balance, lightheadedness, fainting, vomiting, nausea, and slow or shallow breathing. Also, it may cause very low blood pressure and even coma. Therefore, do not exceed the recommended daily dose.
Patients with liver disease, particularly if they have a history of developing a liver problem due to Eripin 300 Tablet ER should avoid taking Eripin 300 Tablet ER. Additionally, anyone taking Delavirdine (a medicine used in the treatment of HIV infection) should not take Eripin 300 Tablet ER as it may reduce the effectiveness of Delavirdine against HIV and the virus may also develop resistance to Delavirdine. It is advised to inform your doctor before taking Eripin 300 Tablet ER if you have any existing heart problem.
You are recommended to consult your doctor before taking Eripin 300 Tablet ER with ibuprofen or other medicines to avoid drug interactions.
The most common side effects of Eripin 300 Tablet ER in children are overgrowth of the gums and jerky movements of the eyes (nystagmus). In some children, it causes problems with behaviour or thinking, mood change, loss of energy and slow or clumsy movements. High doses may cause side effects such as vomiting, sleepiness and unsteadiness in the feet and hands. To avoid these, the dose is increased gradually. As soon as the dose is reduced, these side effects disappear.
Eripin 300 Tablet ER does not cause weight gain. However, on longer term use of a higher dose of Eripin 300 Tablet ER, weight loss can occur. If you experience weight gain after taking Eripin 300 Tablet ER, please consult your doctor.
Eripin 300 Tablet ER can make you feel sleepy as a side effect. However, if you feel extremely sleepy after taking Eripin 300 Tablet ER, especially in the first few weeks of treatment or after a dose increase, please consult your doctor.
The common side effects of Eripin 300 Tablet ER include weakness, drowsiness, dizziness, confusion, restlessness, slurred speech, constipation, loss of coordination, and abnormal eye movement. Most of these side effects do not require medical attention and will resolve gradually over time. However, you are advised to talk to your doctor if you experience these side effects persistently.
Taking Eripin 300 Tablet ER during pregnancy carries risks to the unborn baby, but uncontrolled seizures also pose serious risks. If you are pregnant or planning to become pregnant, do not stop taking your medicine suddenly, but discuss your options with your healthcare provider. Talk to your doctor.
Blood tests are necessary to measure the exact amount of the medicine in your body. This helps your doctor ensure the dose is high enough to prevent seizures but low enough to avoid toxicity. Talk to your doctor.
Take the missed dose as soon as you remember. If your next dose is less than 4 hours away, skip the missed dose and resume your regular schedule; never double your dose. Talk to your doctor.
It may take several days to a few weeks of consistent use for the medicine to reach steady, therapeutic levels in your blood and provide full seizure control. Talk to your doctor.

Disclaimer

While we strive to provide complete, accurate, and expert-reviewed content on our 'Platform', we make no warranties or representations and disclaim all responsibility and liability for the completeness, accuracy, or reliability of the aforementioned content. The content on our platform is for informative purposes only, and may not cover all clinical/non-clinical aspects. Reliance on any information and subsequent action or inaction is solely at the user's risk, and we do not assume any responsibility for the same. The content on the Platform should not be considered or used as a substitute for professional and qualified medical advice. Please consult your doctor for any query pertaining to medicines, tests and/or diseases, as we support, and do not replace the doctor-patient relationship.

Reference

  1. Electronic Medicines Compendium (EMC). Pil.7558 Patient Information Leaflet (PIL). Cheshire, UK: Datapharm; 2025. [Accessed on 02 Jun. 2026] Check here
  2. U.S. Food and Drug Administration (FDA). 084349S087Lbl [FDA Prescribing Information]. Silver Spring, MD: FDA; 2024. [Accessed on 02 Jun. 2026] Check here
  3. Drugs.com Clinical Review Team. Phenytoin Clinical Drug Monograph. Auckland, NZ: Drugs.com; 2026. [Accessed on 02 Jun. 2026] Check here
  4. MedlinePlus. A682022 Patient Information Monograph. Bethesda, MD: U.S. National Library of Medicine (NLM); 2025. [Accessed on 02 Jun. 2026] Check here
  5. DailyMed Database. Druginfo.Cfm Clinical Monograph. Bethesda, MD: National Library of Medicine; 2025. [Accessed on 02 Jun. 2026] Check here
  6. National Health Service (NHS). Phenytoin - NHS Medicines Reference Guide. London, UK: NHS; 2025. [Accessed on 02 Jun. 2026] Check here
  7. Phenytoin Phenytoin. 2018. [Accessed on 22 Mar. 2019]Check here

Country of origin

India
Other Info - ER22767
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