Paroxetine hydrochloride is a selective 5-hydroxytryptamine reuptake inhibitor, which exerts its pharmacological effects by inhibiting the reuptake of 5-hydroxytryptamine by the presynaptic membrane and enhancing 5-hydroxytryptaminergic effects in the central nervous system. The main effects of paroxetine hydrochloride are: 1. Treatment of various types of depression, including depression with anxiety and reactive depression. Common symptoms are sleep disturbance, lack of interest in daily life, fatigue, and loss of appetite. 2. Treatment of obsessive-compulsive disorder. The common symptoms of obsessive-compulsive disorder include repeated and persistent thoughts or imaginations that can cause significant anxiety, resulting in repetitive behaviors or mental activities. 3, treatment of panic disorder with or without square terror, common symptoms are panic attacks, palpitations, sweating, chest tightness, chest pain, numbness and a sense of near death.