Phenytoin 100 Mg Tablet

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Phenytoin Tablet Information

Phenytoin Tablet is a prescription medicine that is available as a Capsule. It is typically used for the treatment of Seizures. Phenytoin Tablet also has some secondary and off-label uses. These are listed below.

The optimal dosage of Phenytoin Tablet is largely dependent on the individual's body weight, medical history, gender and age. The condition it has been prescribed for, and the route of administration also determine the right dosage. Refer to the dosage section for a detailed discussion.

The side effects typically associated with Phenytoin Tablet include Double Vision. Besides the aforementioned side effects, there are other adverse effects of Phenytoin Tablet as well, which are listed below. Normally, these side effects of Phenytoin Tablet are not long lasting and go away when the treatment is finished. However, if these continue for a longer time, consult your doctor right away.

In addition, Phenytoin Tablet's effect is Severe during pregnancy and Moderate for lactating mothers. It is important to know if Phenytoin Tablet has any effect on the kidney, liver and heart. Information on such adverse effects, if any, has been given in the Phenytoin Tablet related warnings section.

Phenytoin Tablet is contraindicated in people with pre-existing medical conditions like Liver Disease, Kidney Disease as it can result in adverse effects. Other contraindications of Phenytoin Tablet have been discussed in the sections ahead.

Drug interactions for Phenytoin Tablet have been reported in the medical literature. See below for a complete list.

In addition to these precautions, you may also note that Phenytoin Tablet is not safe while driving, and is is not addictive in nature.

Phenytoin Tablet Benefits & Uses

Phenytoin Tablet is used to treat the following -

Other Benefits

Phenytoin Tablet Dosage & How to Take

This is the usual dosage recommended in most common treatment cases. Please remember that every patient and their case is different, so the dosage can be different based on the disease, route of administration, patient's age and medical history.

Find the right dosage based on disease and age

Age Group Dosage

Phenytoin Tablet Side Effects

Based on research, the following side effects have been observed when Phenytoin Tablet is used -


  • Nervousness
  • Unusual facial expression
  • Unsteadiness




  • Double Vision

Phenytoin Tablet Related Warnings

  • Is the use of Phenytoin Tablet safe for pregnant women?

    Phenytoin shows severe side effect on pregnant women. For this reason, pregnant women should only take it after taking medical advice.

  • Is the use of Phenytoin Tablet safe during breastfeeding?

    Phenytoin can cause moderate side effects on breastfeeding women. If you feel its side effects, then stop taking this drug and consult your doctor. Take this medicine again only if your doctor advises to do so.

  • What is the effect of Phenytoin Tablet on the Kidneys?

    Phenytoin may have mild side effects on the kidneys.

  • What is the effect of Phenytoin Tablet on the Liver?

    Phenytoin has very mild side effects on the liver.

  • What is the effect of Phenytoin Tablet on the Heart?

    Phenytoin may have mild side effects on the heart. Most people will never see any effect on the heart.


Severe Interaction of Phenytoin Tablet with Other Drugs

Phenytoin Tablet should not be taken with following medicines due to severe side effects it may cause to patients -


Phenytoin Tablet Contraindications

If you are suffering from any of the following diseases, you should not take Phenytoin Tablet unless your doctor advises you to do so -

Frequently asked Questions about Phenytoin Tablet

  • Is this Phenytoin Tablet habit forming or addictive?

    No, you will not get addicted to Phenytoin Tablet.

  • Is it safe to drive or operate heavy machinery when consuming?

    No, you should not drive or operate heavy machinery after taking Phenytoin Tablet as you may feel sleepy.

  • Is it safe?

    Yes, Phenytoin Tablet is safe but you must consult your doctor before taking it.

    Safe, but take only on Doctor's advise
  • Is it able to treat mental disorders?

    Yes, taking Phenytoin Tablet can treat mental disorders.


Phenytoin Tablet Interactions with Food and Alcohol

  • Interaction between Food and Phenytoin Tablet

    Taking Phenytoin Tablet with food can create severe side effects. Discuss this with your doctor.

  • Interaction between Alcohol and Phenytoin Tablet

    Consult your doctor before consuming alcohol while taking Phenytoin Tablet as it can have severe side effects.


Frequently asked Questions about Phenytoin Tablet

Question about 5 years ago

How long can I safely take Phenytoin?

Dr. R.K Singh MBBS , Diabetology

Phenytoin can be safely taken for a long time as prescribed by your doctor. Do not discontinue the treatment suddenly or take it longer than prescribed duration.

Question about 5 years ago

Does Phenytoin cause sleepiness or drowsiness?

Dr. Suhas Bhargav MBBS , General Physician

Yes, Phenytoin can cause sleepiness and drowsiness. It is a common side effect of this antiepileptic medicine. If you observe these unpleasant side effects after consuming medicine, please consult your doctor and follow his/her instructions.

Question about 5 years ago

Does Phenytoin cause birth defects (teratogenic)?

Dr. Yogesh Kumar MBBS , General Physician

Yes, Phenytoin is teratogenic (causes birth defects). As per clinical studies Phenytoin can cause congenital abnormalities like "fetal hydantoin syndrome" when taken during pregnancy. Generally, It causes mental and physical birth defects. Do not consume it during pregnancy until and unless prescribed by a doctor. 

Question almost 5 years ago

Can I take Phenytoin with tramadol?

Dr. R.K Singh MBBS , Diabetology

No, you should not take Phenytoin with tramadol since harmful interaction has been reported between them. Tramadol may decrease the seizure threshold in some patient and also decrease the anticonvulsant activity of Phenytoin. Thus use Phenytoin with tramadol not recommended, unless until prescribed by your doctor.

Question almost 5 years ago

Can I take Phenytoin with Paracetamol?

Dr. Haleema Yezdani MBBS , General Physician

Avoid taking Phenytoin with paracetamol since this reduces the effectiveness of paracetamol. This happens because taking these medicines together increases the metabolism of paracetamol, which in turn reduces its bioavailability (the proportion of a drug substance which enters the circulation). Further, it may also increase the concentration of paracetamol in the blood which can cause liver damage. Please consult your doctor before taking these two medicines at the same time.

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This medicine data has been created by -

Vikas Chauhan

B.Pharma, Pharmacy
5 Years of Experience


US Food and Drug Administration (FDA) [Internet]. Maryland. USA; Package leaflet information for the user; Dilantin® (Phenytoin Sodium)

KD Tripathi. [link]. Seventh Edition. New Delhi, India: Jaypee Brothers Medical Publishers; 2013: Page No 413-415

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