Analysis of Outpatient Installation Pharmacy Waiting Time at Special Hospital of Drug Addiction Jakarta in 2023 Abstract Prescription services waiting time in outpatient installations is one of the indicators for evaluating the performance of pharmaceutical installations that affects the quality of hospital services. Hospitals need to effort that prescription services waiting time meet the Minimum Service Standards (SPM). Through the Lean method with the Value Stream Mapping approach, this study aims to determine the prescription service procedures at the outpatient installation of RSKO Jakarta, identify value added and non-value added and waste that occurs so that factors that cause waste can be analyzed which can be prevented through the strategy recommendations obtained. This is a qualitative research with data collection obtained through observing and recording the e-prescriptions services waiting time at the RSKO outpatient installation, extracting in-depth information from informants and reviewing documents. Observations were made on 20 concoction medicine recipes and 10 concoction medicine recipes. The selection of informants was carried out using a purposive sampling technique and interviews were conducted with patients to obtain value from the customer's perspective according to the principles of the Lean method. The data obtained is then analyzed to obtain the factors affecting the prescription services waiting time duration using a fishbone diagram then a scoring system is carried out by assessing the urgency, severity and growth aspects of the cause problem so that priority recommendations can be formulated. The results of research conducted in April-May 2023 found that the average waiting time for prescription drug services was 49.25 minutes (VAR 17.5%) and for concoction drugs 80.2 minutes (VAR 33%), which means that it still exceeds the SPM set by KMK No. 128 of 2009 (no concoction drug recipe < 30 minutes, concoction drug recipe < 60 minutes). Some of the factors that cause waste are inefficiency in human resources, pharmaceutical inventory systems that have not been automated, inadequate evaluation/monitoring of drug use, the absence of a separate system for emergency prescription services, prescription service SPO that has not been adjusted with the establishment of prescription response time quality standardsfor each process, networks information system that frequently down/loads repeatedly and patient’s interruption for asking information. It is hoped that in the future an improvement strategy can be carried out to improve the waiting time for prescription services; increasing HR efficiency through arrangements so that during peak hours pharmaceutical HR focuses on working on the duties and functions of prescription services, facilitating a pharmaceutical inventory system with an automated system, implementing an evaluation system for monitoring drug use more effectively so that procurement planning becomes more accurate, regulation separates prescription services from the emergency room, providing SPO in accordance with prescription service implementation, separate the information system network between patient services and office and providing reachable information for pastient (visual management).