Doxepin is a tricyclic antidepressant used to treat depression and anxiety. Doxepin has mood enhancement properties to fight the patient’s depression. It also contains a sedative that works for those with insomnia with marked restlessness and nervousness. It is known under the trade names, Adapin and Sinequan, sold in capsule or concentrate forms to be taken orally one to three times a day, with or without food. In the concentrate form, it can be diluted and mixed into water, milk, or fruit juice before being taken, but never mix it into carbonated drinks. Doxepin can also be used to treat other conditions such as chronic pain, peptic ulcer disease, neuralgia, and some skin conditions.