Clonazepam is a generic drug that is used to treat several conditions, including seizures, panic attacks, insomnia, and symptoms related to chronic anxiety and anxiety disorders. It belongs to a class of drugs called benzodiazepines, which work by calming the brain and nerves. Clonazepam is available in different forms, including oral tablets and orally disintegrating tablets. It is usually taken by mouth, typically two or three times a day. Clonazepam is a controlled substance because it carries a risk for dependence and abuse. Some common side effects of this medication include drowsiness, dizziness, and poor movement control.