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What is gabapentin?

Gabapentin (also called Neurontin®) is used to prevent seizures. It is also used to treat migraine headaches and nerve pain. Gabapentin is available in many forms all of which are taken by mouth:

  • A 100-mg capsule
  • A 300-mg capsule
  • A 400-mg capsule
  • A 600-mg white oval tablet
  • An 800-mg white oval tablet
  • A clear to yellow strawberry-flavored liquid (50 mg/ml)

Possible side effects of gabapentin


  • Nausea and vomiting
  • Feeling dizzy, drowsy, or unsteady

Later (usually more than a day after treatment starts)

  • Nausea and vomiting
  • Constipation
  • Blurred or double vision
  • Decreased coordination
  • Feeling unsteady
  • Feeling tired, dizzy, or drowsy
  • Dry mouth
  • Skin rash
  • Eye twitching and tremor
  • Upset stomach

These are the most common side effects, but there may be others. Please report all side effects to the doctor or nurse.

In case of a severe side effect or reaction, call the doctor, nurse, or pharmacist at 901-595-3300. If you are outside the Memphis area, dial toll-free 1-866-2STJUDE (1-866-278-5833), and press 0 once the call is connected.

Special instructions for gabapentin

  • If you are taking gabapentin to help your pain, it will take 3 to 5 days for it to start working. Do not stop taking any other prescribed pain medicines until your doctor tells you to do so.
  • The doctor will increase your dose slowly when you first start taking gabapentin.
  • If you cannot swallow capsules, you can open the capsules and mix the contents with food, juice, or flavored syrups just before taking it.
  • Store gabapentin tablets and capsules at room temperature.
  • Store the liquid medicine in the refrigerator.
  • Do not take this medicine within 2 hours of taking an antacid (such as Maalox® or Mylanta®).
  • Do not stop taking this medicine until your doctor tells you to do so. If you stop taking it all of a sudden, you might have some of these symptoms: rapid heart beat, high blood pressure, heavy sweating, seizures, and feeling nervous, confused, agitated, or irritable.
  • Gabapentin may cause you to feel dizzy or drowsy. Do not operate heavy equipment or drive a motor vehicle until you see how this medicine will affect you.
  • Alcohol (found in many over-the-counter cough/cold medicines) can increase the drowsy feeling caused by gabapentin.
  • It is very important that you take gabapentin exactly as your doctor tells you. This will keep the blood levels constant during the day and night. If you miss a dose, follow these guidelines:
    • If the next dose is not due for at least 4 hours, take the missed dose right away.
    • If the next dose is due in less than 4 hours, do not take the missed dose. Take the next dose at the scheduled time. Never take a double dose unless your doctor or pharmacist tells you to do so.
  • This medicine can increase the risk of falls.


This document is not intended to take the place of the care and attention of your personal physician or other professional medical services. Our aim is to promote active participation in your care and treatment by providing information and education. Questions about individual health concerns or specific treatment options should be discussed with your physician.

St. Jude complies with health care-related federal civil rights laws and does not discriminate on the basis of race, color, national origin, age, disability, or sex.

ATTENTION: If you speak another language, assistance services, free of charge, are available to you. Call 1-866-278-5833 (TTY: 1-901-595-1040).

ATENCIÓN: si habla español, tiene a su disposición servicios gratuitos de asistencia lingüística. Llame al 1-866-278-5833 (TTY: 1-901-595-1040).

تنبيه: إذا كنت تتحدث باللغة العربية فيمكنك الاستعانة بخدمات المساعدة اللغوية المتوفرة لك مجانا. .يرجى الاتصال بالرقم. 5833-278-866-1  (الهاتف النصي: 1040-595-901-1).