Dilantin (Phenytoin)

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Dilantin 30mg

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Dilantin 50mg Infatabs

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Dilantin 100mg

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Dilantin Suspension 125mg/5mL

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Phenytoin 100mg

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Phenytoin suspension 125mg/5mL

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Dilantin 100mg

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Dilantin (Phenytoin) Medication Information

Uses

Dilantin is used to prevent and treat seizures, both generalized tonic-clonic and complex partial seizures. 

Dosage

The capsules are available in 100 mg strength. 

Side Effects

The most common side effects of Dilantin include:

  • Headache
  • Arrhythmias
  • Dizziness
  • Constipation
  • Nausea
  • Liver injury
  • Rash 

Speak with your doctor for a full list of side effects that apply to you if you are taking Phenytoin.

Precautions

Patients who have liver dysfunction will show signs of toxicity earlier than those with normal function when they take Phenytoin. 

If patients develop a skin rash, Dilantin should be stopped. 

Dilantin can inhibit insulin release, so it can cause high blood sugar levels. 

Interactions

Common drug interactions with Dilantin include:

  • Cimetidine
  • Diazepam
  • Fluoxetine
  • Trazodone
  • Carbamazepine 
  • Sucralfate 

Speak with your doctor for more information and before starting a new medication with Phenytoin. 

Storage

Store below room temperature (68-77 ºF). Protect from moisture and light. 

Pharmacist Tips

  • Doctors should monitor your Dilantin level.
  • The dose of Phenytoin that the doctor prescribes should be individualized to you. 
  • The dose of Dilantin will be titrated to best fit your needs. 

Phenytoin FAQs

Can Dilantin be stopped abruptly?

Stopping Dilantin can cause seizures, and seizures that cannot be easily stopped. 

 

How long is Dilantin in your system?

It can take up to a week for Phenytoin to leave your system. 

 

What happens if your Dilantin level is too high?

If you have too much Dilantin in your system it can cause seizures.

 

Is Dilantin hard on the kidneys?

Phenytoin can cause an allergic reaction that can affect your kidneys. 

 

Does Dilantin cause memory loss?

One of the side effects of Phenytoin is memory loss. 

 

Related Drugs

Reference:

Dilantin {package insert}. New York, NY: Pfizer; 2009.

https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/084349s060lbl.pdf

PharmD Medical Writer

Author: Dr. Larisa Roybal, PharmD

Dr. Roybal is a board-certified pharmacotherapy specialist who has practiced in both ambulatory and acute care settings. Her pharmacy interests include oncology and general inpatient pharmacy.

The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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