Doxepin hydrochloride is a medication primarily used to treat anxiety and depression. It belongs to the family of drugs known as tricyclic antidepressants. Some common synonyms for doxepin hydrochloride include doxepin HCl, Adapin, Sinequan, Prudoxin, and Zonalon. These alternate names may be used interchangeably with doxepin hydrochloride and may appear on labels, prescription bottles, or medical records. It is important to note that while these names all refer to the same drug, they may vary in their specific dosages or formulations. As always, it is best to consult with a healthcare professional before making any changes to medication regimens.