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Phenytoin is classified as an anticonvulsant, or more commonly—anti-epileptic. It is a custom pharmacy drug that works to reduce abnormal electrical activity (brain impulses) that can lead to certain types of seizures.


Your compounding pharmacist can compound phenytoin into various forms of delivery. Talk to your doctor about what form may be optimum for you. Some of the most common forms are as follows: liquids, chewable tablets, and extended-release capsules. If your doctor prescribes phenytoin, ask him or her to thoroughly explain your recommended dosage. Follow your doctor's direction on usage and dosage carefully. Phenytoin may be compounded for intravenous usage or injections as well if your doctor advises; ask your doctor for an overview of all forms of delivery. Consult with your compounding pharmacist if you have general questions about this drug. Always see your doctor if you have any issues or problems while using phenytoin, or questions about your treatment.


Modern drugs have many particular benefits; however, some drugs may cause unwanted side effects. If you experience any side effects while taking phenytoin, be mindful of them and see your doctor if they increase in severity or linger. It is impossible to predict which, if any, side effects you might experience while taking phenytoin, so talk to your doctor about all the possible side effects at your consultation. A partial list of side effects is provided below.

  • Difficulty Falling Asleep
  • Trouble Staying Asleep
  • Pain (penis)
  • Curving of Penis
  • Constipation
  • Unwanted Hair Growth
  • Change in Facial Features
  • Enlarged Lips
  • Overgrowth of Gums
  • Abnormal Movement of Body
  • Uncontrolled Eye Movement
  • Difficulty with Thinking
  • Loss of Coordination
  • Confusion
  • Slurred Speech
  • Dizziness
  • Headache

Severe Side Effects:

While many users may experience only mild side effects, or perhaps no side effects at all, others may experience severe side effects. Severe side effects require immediate medical attention. If you experience anything that feels severe or anything that is listed below, seek medical attention immediately.

  • Joint Pain
  • Nausea and/or Vomiting
  • Swollen Glands
  • Blisters
  • Easy Bruising
  • Swelling of Face
  • Unusual Bruising
  • Jaundice
  • Pain (upper right of stomach)
  • Extreme Tiredness
  • Abnormal Bleeding
  • No Appetite
  • Flu-Like Symptoms
  • Fever
  • Sore Throat
  • Ulcers in Mouth
  • Rash


All patients considering the use of phenytoin should undergo a complete physical and medical review with their primary care doctor before beginning use. Only your doctor can decide if phenytoin will be safe for your use.

Always inform your doctor of all medications, drugs, supplements, or otherwise that you are taking, using, or have taken.

Phenytoin may be contraindicated for many conditions. Speak to your doctor about contraindications to be sure this drug is safe for your use.

Phenytoin is contraindicated for the following:

  • Hypersensitivity to Phenytoin
  • Hypersensitivity to Other Hydantoins
  • "It is rare to find health professionals who are so willing to educate the patient on what they need to know."

    Clair C. | West Hollywood, CA