Abstract Background Public health genomics recognises the potential of genomic knowledge for enhancing population health. Adverse drug reactions (ADR) and lack of efficacy have significant clinical and economic burdens, which can be mitigated by pharmacogenomics (PGx) testing. Pharmacists can play a vital role in facilitating the implementation of PGx into routine clinical care. This will promote quaternary prevention, to protect individuals from medical intervention that can cause more harm than good. Objectives To assess attitudes, opinions, expectations, practices, and concerns of Portuguese pharmacists regarding PGx implementation. Methods An observational cross-sectional web-based survey was developed based on literature review, adapted to the national context, and validated in a focus group. The target population were adults residing in Portugal with a degree in Pharmaceutical Sciences or equivalent, with convenience sampling. Descriptive statistics were performed. Results From 303 participants, 98% believe that PGx is an important area of pharmaceutical sciences and 97% indicate that PGx should be included in continuing education. Almost all (99%) anticipate that PGx implementation will prevent the administration of ineffective drugs and inappropriate doses, 98% expect PGx will reduce ADR. Major concerns are related with direct-to-consumer sale of PGx tests via internet (78%) and unauthorized access to test results (91%). Currently, 25% are familiar with reliable sources of information on PGx, but only 11% feel qualified to recommend PGx testing, and 10% have analysed PGx reports. Conclusions There are positive opinions and expectations regarding the potential benefits of PGx tests. However, there are regulatory concerns and lack of readiness for immediate application. Pharmacists express interest in learning more about PGx, highlighting the need for continuous education and training to integrate it effectively into routine pharmaceutical practice. Key messages • Pharmacists recognize the benefits of PGx implementation for quaternary prevention. • Regulatory concerns and readiness gaps in PGx emphasise a need for training and life-long education of pharmacists.
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