As a tricyclic antidepressant, Doxepin inhibits the reuptake of serotonin and norepinephrine. Doxepin shows therapeutic effects on atopic dermatitis and chronic urticaria that also improves cognitive processes as well as protect the central nervous system. Doxepin has anti-inflammatory effects and reduces oxidative stress[1] [2] [3].

The protective effect of doxepin is associated with the enhancement of PSD-95 and synapsin 1 expression via PI3K/AKT/mTOR signaling pathway [4]. Western Blot Analysis [4] Cell Line: SH-SY5Y human neuroblastoma cell line Concentration: 10 ng/mL Incubation Time: 2 h Result: Improved the protein expre-ssion levels of PSD-95, synapsin 1 and p-AKT in SH-SY5Y cells, and decreased the protein expression level of p-mTOR in SH-SY5Y cells.

Doxepin (intraperitoneal injection of 1 mg/kg and 5 mg/kg doxepin once a day for 21 days) can protect against the Aβ1-42-induced memory impairment in rats [4]. Animal Model: SD male rats [4] Dosage: 1, 5mg/kg Administration: Doxepin (intraperitoneal injection of 1 mg/kg and 5 mg/kg doxepin once a day for 21 days) Result: Improved the protein expression levels of PSD-95 and synapsin 1 in hippocampus and tem-poral lobe, and decreased the protein expression level of p-AKT in hippocampus and temporal lobe after treatment of 1 mg/kg of doxepin.