A medication error is an event that can jeopardize patient safety by health workers, especially in terms of patient treatment services that should be avoided. The occurrence of medication errors can occur in each treatment process, one of which is in the prescribing phase. The prescribing phase is the part when a doctor prescribes a patient's medication. The purpose of this study was to determine the causes and incidence of medication errors in the prescribing phase in the treatment services at H. Adam Malik General Hospital. This research is a prospective study or data collection that is new or ongoing. The research subjects were prescription internal medicine patients who met the inclusion and exclusion criteria with a total sampling method that took a prescription in 2018 at the Outpatient Pharmacy Working Group. The results of the study were obtained from 984 prescriptions for a medication error in the prescribing phase of 33.82%. There was no prescription address, doctor's SIP, date of birth, gender, patient weight, diagnosis, route of administration as much as 100% of the total prescription. Lack of dosage strength, dosage units 49 times each (4.98%), and errors did not write down the name of the complete medical device and the amount was 3 times (0.30%). The main cause is the unavailability of data filling formats or templates on the computer or in the MIRSA Enterprise® application that is used as a recipe management software.
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