Background: The present study was designed to investigate the effect of citalopram, ketamine, glycine and their combinations on animal models of depression. Methods: Swiss Albino male mice were subjected to chronic mild stress for 6 weeks for inducing depression, and randomly divided into different groups: citalopram (5 and 10 mg/kg), ketamine (17.5 and 35 mg/kg), glycine (50 and 100 mg/kg),...