| Noun | 1. | doxepin hydrochloride - a tricyclic antidepressant (trade names Adapin and Sinequan) with numerous side effects (dry mouth and sedation and gastrointestinal disturbances)tricyclic, tricyclic antidepressant, tricyclic antidepressant drug - an antidepressant drug that acts by blocking the reuptake of norepinephrine and serotonin and thus making more of those substances available to act on receptors in the brain |