RecruitingPhase 4Drug trialMetformin in Post Chronic Pancreatitis Diabetes MellitusThe goal of this clinical trial is to evaluate the efficacy and safety of metformin in treating patients with post chronic pancreatitis diabetes mellitus (PPDM-C). The main questions it aims to answer are: * What is the efficacy of metformin in glycemic control in patients with PPDM-C? * What is the incidence of adverse effects associated with metformin in patients with PPDM-C? Participants will be randomly assigned to receive either metformin or a placebo to see if metformin provides significant glycemic control and to assess the safety profile of the treatment.