Bridelia stipularis locally known as 'Harinhara' native in hill tract area. The plant is traditionally used in cough, asthma and catarrh by the Chakma ethnic people of Bangladesh. In this study, we investigated the toxicological, anti-allergic, neuropharmacological potential of leaves extract and profiling of its bioactive polyphenols by HPLC for in-silico molecular docking. Phytochemical test confirmed the existence of phytochemicals including tannin, flavonoid, saponin, alkaloid, glycoside etc. In toxicity study, the extract was safe up to 3 g/kg oral dose in mice. The studied showed no organ specific toxicity at 500 mg/kg oral dose. Anti-allergic activity performed by using TDI-induced allergic mice model. The extract significantly reduced the TDI-induced allergy like symptoms such as scratching, sneezing, swelling (P < 0.05). Additionally, the extract also ameliorated the leukocytes count in blood and bronchoalveolar lavage (BAL) fluid. The neuropharmacological activity test was conducted by following the open field method in mice model, at both doses of extract at 300 and 500 mg/kg showed mild CNS depressant effect. HPLC profiling identified the presence of seven phenolic compounds, among these rutin hydrate demonstrated the best docking score of -7.4 kcal/mol same as anti-allergic drug against (H1R). On the other hand exhibited rosmarinic acid and myricetin -7.9 and -7.8 kcal/mol against GABAA whereas standard CNS drug showed -7.7 kcal/mol. In conclusion, B. stipularis is safe and rich in different polyphenolic compounds which were found effective against diseases.