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Sinequan
Sinequan Sinequan is doxepin hydrochloride, a tricyclic antidepressant with sedative and anti-itch effects.
Sinequan is doxepin hydrochloride, a tricyclic antidepressant with sedative and anti-itch effects. It works by increasing the availability of norepinephrine and serotonin and also blocks histamine and several other receptor types.