Keppra (Levetiracetam) seriousside effects. Call your doctor at once if you have a serious side effect such as:

  • hallucinations, unusual thoughts or behavior
  • bruising, severe tingling, numbness, pain, muscle weakness
  • feeling very weak or tired
  • fever, chills, body aches, flu symptoms, sores in your mouth and throat
  • problems with walking or movement
  • the first sign of any skin rash, no matter how mild
  • severe skin reaction – fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling