Clonazepam, sold under the brand name Rivotril, is a prescription medication primarily used to treat anxiety disorders and insomnia. It belongs to a class of medications called benzodiazepines, which work by enhancing the effects of a neurotransmitter in the brain called GABA. Clonazepam helps to slow down brain activity, leading to a calming effect that can reduce anxiety symptoms such as excessive worry, fear, and restlessness. It can also help individuals with insomnia fall asleep and stay asleep. However, Clonazepam should only be used under the guidance of a healthcare professional and with caution, as it can be habit-forming and may cause dependence or withdrawal symptoms when stopped suddenly.