Background: The prevalent usage of proton pump inhibitors (PPIs) is a testament to the effectiveness of this class of medications, but it also introduces risk associated with inappropriate prescriptive and consumptive practices. Because of the negative effect of incorrect usage and overdose of PPIs, it is very important for physicians to only prescribe these drugs when needed. However, recent studies showed some concerns about long-term PPIs consumption. The rational prescription of medications is vital to ensuring the optimal use of medical resources, providing effective therapy and minimizing adverse drug reactions. Methods: This observational study was conducted in the department of Pharmacology and therapeutics, Sylhet M.A.G. Osmani medical college, Sylhet, in collaboration with the department of Medicine, Surgery, Gastroenterology, Obstetrics and gynaecology, Sylhet M.A.G. Osmani medical college hospital, Sylhet, from July 2022 to June 2023. The sample size for this study was 600. Usage of PPIs was considered to be appropriate on the basis NICE guidelines and recommendations by Scarpignato et al. (2016) committees on behalf of three Italian scientific societies. Result: For 600 PPIs prescriptions, total 705 case sheets were reviewed. The mean age of the study patients was 42.94±17.16 years. Female were found more 359(59.8%) than male 241(40.2%). Out of 600 patients, based on the indications of PPI usage, 287 (47.8%) of prescriptions were found appropriate, whereas inappropriate prescriptions were found in 313 (52.2%) cases. Out of 287 patients who were prescribed PPIs in an appropriate indication, 175 (61%) patients were given PPIs in an appropriate dose, whereas inappropriate dose was found in 112 (39%) of patients. Again, among 175 patients who were prescribed PPIs for appropriate dose, 24 (13.7%) patients were given PPIs in an appropriate frequency, whereas inappropriate frequency was found in 151 (86.3%) of patients. Finally, 24/600 (4%) patients were prescribed in an appropriate indication with an appropriate dose and frequency, whereas inappropriate prescription were found in 576/600 (96%) patients. PPIs were used as prophylaxis for NSAIDs in highest number 147(51.2%) of patients. Oral was the most common 348(58%) route of prescribing PPIs. Omeprazole was the highest 577(96.2%) prescribed PPIs. Conclusion: Based on this study result, it could be concluded that in most of the patients PPIs prescriptions were not following appropriate indications, dose and frequency recommended by reference guidelines. Like any other drugs, PPIs should be prescribed for a clear indication, the minimum dose needed for the expected effect and medication halted when no longer necessary upon re-evaluation.