A semi-automated system (100) suitable for use in a hospital setting for filling patient-specific liquid medication prescriptions from balk medicine containers (104) into oral syringes (S) for administration on a just-in-time basis. The system enables hospital pharmacists to simplify and streamline their task, increasing the number of prescriptions mat can be filled in a day, improving patient safety and care by minimizing medication errors and the consequences that ensue. The present invention also includes a novel adapter cap for use in interfacing between bulk medicine containers (104) and syringes (S) having a Luer-lock fitting.