Serious Side Effects of Gabapentin

Call your doctor right away if you have serious side effects. Call 9-1-1 if your symptoms feel life-threatening or if you think you’re having a medical emergency. Serious side effects and their symptoms can include the following:

  • Changes in mood or anxiety. Symptoms can include:
    • thoughts of suicide or dying
    • attempts to commit suicide
    • anxiety that’s new or gets worse
    • crankiness that’s new or gets worse
    • restlessness
    • panic attacks
    • trouble sleeping
    • anger
    • aggressive or violent behavior
    • extreme increase in activity and talking
    • unusual changes in behavior or mood
  • Changes in behavior and thinking, especially in children ages 3 to 12 years. Symptoms can include:
    • emotional changes
    • aggressiveness
    • trouble concentrating
    • restlessness
    • changes in school performance
    • hyper behavior
  • Serious and life-threatening allergic reaction. Symptoms can include:
    • skin rashes
    • hives
    • fever
    • swollen glands that do not go away
    • swollen lips and tongue
    • yellowing of your skin or the whites of your eyes
    • unusual bruising or bleeding
    • severe tiredness or weakness
    • unexpected muscle pain
    • frequent infections