Trazodone hydrochloride tablets can treat insomnia. It is an antidepressant drug, a derivative of the triquinopyridine class, which can treat insomnia with depressed mood or sleep disorders in depressed patients with insomnia. It is used by taking it at bedtime and gradually adjusting it from small doses, maintaining it with the smallest dose that can control the patient’s symptoms and reduce the adverse effects of the drug. This drug is a 5-hydroxytryptamine receptor antagonist and 5-hydroxytryptamine reuptake inhibitor. It antagonizes 5-hydroxytryptamine receptors and inhibits 5-hydroxytryptamine reuptake, which has an antidepressant effect, a sedative effect and a mild muscle relaxant effect, and a sleep-promoting effect even if the antidepressant effect is not considered. This drug is relatively fast-acting and has a relatively low incidence of cardiovascular side effects, but long-term use may also cause sinus bradycardia.