Phytochemical and pharmacological evaluation of bacopa monniera for anti – anxiety activity

Abstract

Anxiety, a common emotional response to stress, involves numerous brain regions and neurotransmitters, including the amygdala, prefrontal cortex, and hippocampus, and is partially by genetic, environmental, and biological factors. This study evaluates Bacopa monnieri, a herb known in Ayurvedic medicine for its cognitive-enhancing and adaptogenic properties, as a potential anti-anxiety agent. The plant's ethanolic extract revealed a variety of phytochemicals, including alkaloids, flavonoids, and saponins. Acute toxicity studies indicated a high safety margin with an LD50 exceeding 2000 mg/kg body weight. The anti-anxiety effects were assessed using three established models. In the Elevated Plus-Maze Test, Bacopa monnieri significantly reduced anxiety levels in mice, comparable to the standard anxiolytic benzodiazepine. The Hole-Board Test showed increased head-dipping and rearing behaviors, while reducing immobility, suggesting anxiolytic activity. The Light-Dark Exploration Test demonstrated the herb's ability to decrease anxiety-related behaviors, including a reduction in rearing in dark compartments and increased exploration of light areas. These findings provide scientific validation for Bacopa monnieri's traditional use in treating anxiety and support its potential as an effective and safe anti-anxiety agent in managing central nervous system disorders.