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. 2016;7(11):38-42. Accessed August 24, 2026. https://irjponline.org/index.php/irjp/article/view/1545