Doxepin is a tricyclic antidepressant primarily used to treat anxiety and depression. It works by affecting the balance of chemicals in the brain, including serotonin and norepinephrine. There are several alternative names used to refer to this medication. Some common synonyms for Doxepin include Adapin, Sinequan, Quitaxon, and Zonalon. These names are based on the different brands and formulations of the medication. Regardless of the name used, it is important for patients to discuss their options with a healthcare professional before starting or changing their medication regimen. Side effects and other considerations may vary based on the specific form of the drug.