Introduction Accurate medication records are integral to healthcare, especially for obstetrics and gynecology and pediatric patients. When pharmacists perform verbal interventions with prescribers, these were often not updated in the patients' medication records. To address this issue, the order-on-behalf (OOB) service by pharmacists was implemented in late November 2015, with the aim of providing timely updates of patients' medication records. The impact of service will be evaluated in this article. Methods The OOB records from December 2015 to April 2017 were collected and reviewed. Details collected include patient type, date performed, date of prescription, and details of interventions. Respective pharmacists who entered the orders were approached for further clarifications, where required. This was a process improvement project exempted from review. Results A total of 1501 entries (824 for women, 677 for children) were reviewed. Top three medication-related problems identified were inappropriate dosage regimen (845), improper drug selection (185), and therapeutic substitution (226). The most commonly implicated drugs were hormones (28%) and antibiotics (18%) for obstetrics and gynecology-related entries and antibiotics (27%) and antiepileptic drugs (6%) for pediatric-related entries. Conclusions The OOB service has updated many patients' medication records. Having updated records enhances patient safety because it provides the most accurate information for the prescribers at the next patient visit. Review of OOB data identified the most common types of medication-related problems, as well as the patient subtypes involved. This provides a platform for future work to be performed on system optimizations to improve patient safety.