The most common side effects seen during clinical trials of topamax in preventing frequently recurring migraines were tiredness, pins
and needles in the fingers
and toes, dizziness,
nausea, diarrhea, indigestion, dry mouth, weight lost, decrease in appetite, drowsiness, forgetfulness, difficulty with concentration or attention, difficulty in sleeping (insomnia), mood swings, depression, changes in taste and vision disorders.