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Most existing models learnt representations for medical concepts based on EHRs and make recommendations with the learnt representations. However, most medications appear in EHR datasets for limited times (the frequency distribution of medications follows power law distribution), resulting in insufficient learning of their representations of the medications. Medical ontologies are the hierarchical classification systems for medical terms where similar terms will be in the same class on a certain level. In this paper, we propose <jats:bold>OntoMedRec<\/jats:bold>, the <jats:italic>logically-pretrained<\/jats:italic> and <jats:italic>model-agnostic<\/jats:italic> medical <jats:bold>Onto<\/jats:bold>logy Encoders for <jats:bold>Med<\/jats:bold>ication <jats:bold>Rec<\/jats:bold>ommendation that addresses data sparsity problem with medical ontologies. We conduct comprehensive experiments on real-world EHR datasets to evaluate the effectiveness of OntoMedRec by integrating it into various existing downstream medication recommendation models. The result shows the integration of OntoMedRec improves the performance of various models in both the entire EHR datasets and the admissions with few-shot medications. We provide the GitHub repository for the source code. 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