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BACKGROUND: Antimicrobial consumption has been increasing lately. Hence, effective strategies are required to control antimicrobial use and decrease the development of antimicrobial resistance. OBJECTIVE: To evaluate the impact of the use of a mobile app on the implementation of antimicrobial stewardship program (ASP) interventions. METHODS: This was a longitudinal study conducted at El-Nile Badrawi Hospital in Cairo, Egypt, on inpatients receiving antimicrobials from January 2018 to December 2019. The study included 2 phases: the preimplementation phase, which included a paper-based ASP developed according to the Centers for Disease Control and Prevention Core Elements of Hospital Antibiotic Stewardship Programs 2014, and the mobile app phase where the MEDIcare Pro mobile app was developed and used in ASP intervention implementation. The study outcomes were antimicrobial consumption and cost, length of hospital and intensive care unit (ICU) stay, 30-day mortality rate and readmission rate, and detection of drug-related problems (DRPs). RESULTS: The mobile app statistically significantly decreased antimicrobial consumption from 75.1 defined daily dose (DDD)/100 bed-days in the preimplementation phase to 64.65 DDD/100 bed-days in the mobile app phase, with a total cost savings of E£1,237,476. There was a significant reduction in the length of ICU stay, with a mean difference of 1.63 days between the 2 phases, but no significance was detected regarding length of hospital stay or readmission rate. There was a statistically significant decrease in mortality rate from 1.17% in the preimplementation phase to 0.83% in the mobile app phase (P = 0.02). The frequency of DRPs detected by pharmacists statistically significantly increased from 0.54/100 bed-days in the preimplementation phase to 3.23/100 bed-days in the mobile app phase. CONCLUSION: The use of a mobile app was found to be effective, applicable, and usable in guiding health professionals on rational antimicrobial use.