Hi & Welcome.
Yes, it can cause
drowsiness as its one of the common side effects.
Keppra (
Levetiracetam) is an anti-convulsant drug used to treat partial onset seizures.
Its common side effects include drowsiness, weakness, loss of appetite,
stuffy nose, tiredness, and
dizziness. It may also cause
hallucinations, fever, chills, body ache, and problems with walking or movement.
Drowsiness which may affect your ability to drive, swim or operate machinery.
In view of the above you are advised not to drive a car or to swim while taking this medication.
Hope this answers your query.
A feedback is appreciated.