Klonopin (clonazepam) is a benzodiazepine. Clonazepam affects chemicals in the brain that may be unbalanced. Clonazepam is also a seizure medicine, also called an anti-epileptic drug. Klonopin is used to treat certain seizure disorders (including absence seizures or Lennox-Gastaut syndrome) in adults.
Common side effects of Klonopin include: drowsiness. Other side effects include: upper respiratory tract infection, ataxia, depression, and dizziness. See below for a comprehensive list of adverse effects.