Xanax is not typically used to treat arrhythmia (irregular heartbeat). In fact, the use of Xanax may be contraindicated in people with certain heart conditions. Xanax is a benzodiazepine medication that is primarily used to treat anxiety and panic disorders. It works by enhancing the effects of a neurotransmitter in the brain called gamma-aminobutyric acid (GABA), which helps to reduce anxiety and promote relaxation. While Xanax may help to relieve anxiety-related symptoms, it is important to discuss any heart conditions with a healthcare provider before taking Xanax or any other medication.