Anxiolytic Properties of Myrica nagi Bark Extract

摘要

Myrica nagi Hook (syn. Myrica esculenta Buch. & Ham) (Myricaceae) is commonly known as box berry. The bark of Myrica nagi is used in the treatment of mental illness by different ethnic groups of the rural region of Orissa (India). In the present work, the anxiolytic and antidepressant effects of an ethanol extract of M. nagi were analyzed at three different dosages (100, 200, and 400 mg/kg, p.o.) by elevated plus-maze, light/dark exploration test, tail suspension test, and the forced swimming model. Oral administration of the ethanol extract (100, 200, and 400 mg/kg, p.o.) of M. nagi showed significant (p < 0.01) and dose-dependent anxiolytic activity by increasing time spent in the open arms of the elevated plus-maze and in the lit box indicating an anxiolytic effect. Nevertheless this treatment was unable to exhibit an effect identical to antidepressants in the tail suspension and forced swimming tests. Altogether, these results suggest an anxiolytic effect of the ethanol extract of M. nagi.