Clonazepam, also known by its brand name Klonopin, is a medication used to treat anxiety and panic disorders. It belongs to a class of drugs called benzodiazepines, which work by affecting the brain's neurotransmitters to produce a calming effect. It is a highly effective medication, but it can also be habit-forming and has the potential for abuse. This is why it is classified as a controlled substance and can only be obtained with a prescription.