Background: The World Health Organization (WHO) has recognized antibiotic resistance as one of the top 10 global public health threats facing humanity. Antibiotic resistance remains a major global health challenge, primarily driven by inappropriate and excessive prescribing. Primary care plays an important role, accounting for 90% of total antibiotic prescription. In Spain, antibiotic consumption continues to rise, showing significant regional variability and remaining far from the European goal of a 20% reduction. Tackling this issue requires effectives and efficient implementation strategies to promote sustainable changes in prescribing behaviours.
Main Hypothesis: An adaptive intervention strategy based on a SMART design, combining educational interventions with tailored second-stage strategies for non-responders, will achieve a clinically relevant reduction in the number of antibiotics prescribed and dispensed per 100 GP visits over 12 months, compared with baseline prescribing levels and with less intensive intervention sequences.
Secondary Hypotheses
1. GPs receiving the Hybrid educational intervention will achieve a greater reduction in the number of antibiotics prescribed and dispensed per 100 visits at 12 months compared with those receiving the Moodle based intervention.
2. Among non-responders to the first-stage educational intervention, general practitioners receiving an intensified second-stage strategy (audit and feedback combined with a tailored face-to-face pharmacist intervention or a personalized detailed feedback report) will achieve a greater reduction in antibiotic prescribing and dispensing at 12 months compared with those receiving audit and feedback alone.
3. The tailored face to face intervention delivered by the Primary Care Pharmacist will be the most cost effective second stage strategy, followed by the Detailed Feedback Report and Audit & Feedback alone.
4. Specific GP related factors (e.g., baseline prescribing level, years of experience, diagnostic patterns) may predict which first stage or second stage intervention is most effective.
Objective: To develop and evaluate the effectiveness of an adaptive intervention in primary care, based on a SMART design that first applies educational strategies and subsequently provides audit and feedback (A&F) to all non responders, with A&F being either delivered alone or augmented with a tailored face to face intervention by the primary care pharmacist (PCP) or a personalized detailed feedback report, in reducing the number of antibiotics prescribed and dispensed per 100 general practitioner visits among patients aged over 14 years.
Methods: This study is a randomized controlled trial (RCT) using a Sequential, Multiple Assignment, Randomized Trial (SMART) design conducted in primary care settings across four Spanish regions (Balearic Islands, Catalonia, Galicia, and the Basque Country). In the first stage, randomization will occur at the level of the primary health care center (PHC), with each PHC allocated (1:1) to one of two educational strategies: Moodle based training or Hybrid training. The Hybrid strategy combines the Moodle online module with in person training sessions delivered at the PHC. Both strategies include visual educational materials displayed in the PHC to promote appropriate antibiotic use among patients. After four months, the second randomization will take place at the level of individual general practitioners (GPs). GPs will be classified as responders or non responders based on changes in their rate of dispensed antibiotic prescriptions per 100 GP visits. Non responders will undergo a second randomization (1:1:1) to one of three strategies: audit and feedback (A&F) alone, A&F augmented with a tailored face to face intervention delivered by a primary care pharmacist (PCP), or A&F augmented with a personalized detailed feedback report. Responders will continue with their initial educational strategy without further modification. The primary outcome is the number of antibiotics prescribed and dispensed per 100 GP visits at 12 months, obtained from regional e prescription databases. Secondary outcomes include total antibiotic consumption, adherence to PRAN rational use indicators, and the cost effectiveness of the intervention. Subgroup analyses will explore GP and patient characteristics influencing intervention outcomes.
Applicability and Transferability: This project has high immediate applicability within the Spanish National Health System, as the intervention is fully aligned with existing structures and can be implemented without regulatory changes. Its scalable and flexible design allows transferability to other regions, healthcare settings (including hospitals and emergency care), therapeutic areas, and the development of digital decision-support tools, supporting sustainable antimicrobial stewardship policies.
Relevance of the Proposal: Antibiotic resistance represents a critical global and national public health threat, largely driven by inappropriate antibiotic use in primary care, where prescribing variability between professionals remains high. This project directly addresses current gaps in antimicrobial stewardship by generating robust real-world evidence on the effectiveness, prioritization and cost-effectiveness of adaptive, data-driven interventions aligned with European and national strategic objectives.
Novelty of the Proposal: This study is conceptually innovative in applying a SMART (Sequential, Multiple Assignment, Randomized Trial) design to antimicrobial stewardship, enabling adaptive, personalized interventions based on individual prescribing behaviour rather than fixed uniform strategies. The strong alignment between hypothesis, objectives, sample size and advanced statistical methods ensures a rigorous and novel evaluation framework within a well-established research line of the RICAPPS network.