Introduction A National Cancer Information System is planned for phased implementation in Irish cancer centres to enable electronic prescribing (ePrescribing) of systemic anti-cancer therapy. This study aimed to capture the opinions of healthcare professionals in a hospital setting relating to the current paper-based workflow for systemic anti-cancer therapy prescribing and their attitudes and expectations of the new ePrescribing system to develop recommendations, which assist in the planning and implementation of future ePrescribing systems. Methods A mixed methods study of concurrent design was conducted. Interviews with healthcare professionals primarily aimed to evaluate processes and identify areas requiring improvement within the current paper-based workflow for systemic anti-cancer therapy prescribing. An online questionnaire adapted from the Information Systems Expectations and Experiences tool primarily aimed to capture expectations of the new ePrescribing system and attitudes towards the transition. Results Twelve healthcare professionals were interviewed, and 50 healthcare professionals responded to the online questionnaire (response rate: 33.3%). Eight major themes emerged from interview transcripts relating to opinions on the paper-based workflow. Questionnaire respondents reported positive attitudes towards ePrescribing implementation and had high expectations for workflow improvements and functionalities of the new system. Seven recommendations for ePrescribing implementation were developed: (1) prioritise specific processes; (2) plan for changes in communication; (3) repeat research in the post-implementation setting; (4) ensure good information technology infrastructure and system support; (5) ensure optimum training; (6) outline limitations of clinical decision support; (7) provide clear instructions on local configurability. Conclusion This study identifies potential challenges in transitioning to ePrescribing and provides recommendations, which assist stakeholders in ensuring safe and effective transitions, thus informing future ePrescribing systems’ implementation in haematology/oncology settings.