FORMULATION AND IN-VITRO EVALUATION OF GASTRO-RETENTIVE MICROSPHERE CONTAINING CALENDULA OFFICINALIS FOR THE TREATMENT OF PEPTIC ULCERS USING OKRA MUCILAGE AND ETHYL CELLULOSE. Int. Res. J. Pharm. [Internet]. 2016 Nov. 7 [cited 2026 Aug. 24];7(11):38-42. Available from: https://irjponline.org/index.php/irjp/article/view/1545