Zyban is a prescription medication primarily used to help people quit smoking. It contains the active ingredient bupropion, which works by affecting certain chemicals in the brain that are involved in addiction and mood regulation. By reducing withdrawal symptoms and cravings, Zyban can make it easier for individuals to stop smoking. In addition to its use for smoking cessation, bupropion is also prescribed to treat depression and anxiety disorders. It is important to follow a healthcare provider's instructions when using Zyban, as it may not be suitable for everyone and can have side effects.