Dizziness, drowsiness, dry mouth, difficulty sleeping, tiredness, tingling of the hands/feet, constipation, and metallic taste may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including: temporary difficulty concentrating/finding words/remembering things, signs of kidney stones (such as painful urination, fever, chills, pink/bloody urine), rapid breathing, fast/slow/irregular heartbeat, bone pain/broken bones, loss of consciousness, change in sexual ability/interest, unusual bleeding/bruising.

A small number of people who take anticonvulsants for any reason (such as seizure, bipolar disorder, pain) may experience depression, suicidal thoughts/attempts, or other mental/mood problems. Tell your doctor right away if you or your family/caregiver notice any unusual/sudden changes in your mood, thoughts, or behavior including signs of depression, suicidal thoughts/attempts, and thoughts about harming yourself.

Rarely, topiramate may cause a very serious eye problem, generally within 1 month of starting treatment. If untreated, this eye problem can lead to permanent blindness. Get medical help right away if any of these side effects occur: sudden vision changes (such as decreased vision, blurred vision), eye pain/redness.