WHO AWaRe Classification: A Framework for Rational Antibiotic Use and Stewardship
The WHO AWaRe classification categorizes antibiotics into three groups based on resistance potential and spectrum of activity.
Access antibiotics are first-line, narrow-spectrum agents with lower resistance risk and should constitute at least 60% of total antibiotic consumption.
Watch antibiotics are broad-spectrum with higher resistance potential and are key stewardship targets, reserved for specific indications.
Reserve antibiotics are last-resort options for multidrug-resistant infections and require strict monitoring.
Practice Snapshot: AWaRe Classification
The WHO Expert Committee on Selection and Use of Essential Medicines developed the AWaRe classification in 2017, updated every two years. Groups are:
Access: Narrow spectrum, low resistance potential, recommended as first- or second-choice empiric therapy. Includes most oral antibiotics for primary care.
Watch: Broad spectrum, higher resistance potential, prioritized for stewardship monitoring. Use limited to infections where benefit over Access agents is clear.
Reserve: Reserved for confirmed or suspected multidrug-resistant infections when other options have failed. Strictly controlled use.
Global target: at least 60% of total antibiotic consumption from the Access group (WHO 13th General Programme of Work 2019–2023).
Background
Antimicrobial resistance (AMR) is one of the most pressing global health threats, driven largely by the inappropriate and excessive use of antibiotics. To address this, the World Health Organization (WHO) introduced the AWaRe classification in 2017 as a practical tool for antibiotic stewardship at local, national, and international levels. The classification groups antibiotics into three categories — Access, Watch, and Reserve — based on their spectrum of activity, resistance potential, and clinical indications. By standardizing how antibiotics are monitored and prescribed, the AWaRe framework aims to optimize use, preserve the effectiveness of existing drugs, and curb the rise of resistant infections.
The AWaRe Classification Framework
The AWaRe classification is updated every two years by the WHO Expert Committee on Selection and Use of Essential Medicines. It is designed to support antibiotic stewardship programs by providing a clear, evidence-based hierarchy of antibiotic use. The classification also serves as a monitoring tool: countries and institutions can track consumption patterns and set targets to improve prescribing practices. The WHO has set a global target that at least 60% of total antibiotic consumption should come from the Access group, reflecting the need to prioritize narrow-spectrum, low-resistance-potential agents.
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The Access Group
The Access group includes antibiotics that are generally narrow in spectrum and have activity against a wide range of common bacterial pathogens. These agents have a lower potential to select for resistance compared with Watch and Reserve antibiotics. Access group antibiotics are recommended as essential first- or second-choice empiric treatment options for many common infectious syndromes in the WHO Model Lists of Essential Medicines. They also have well-established safety profiles with generally low toxicity. In primary care settings, nearly all oral antibiotics should belong to the Access group. Examples include amoxicillin, doxycycline, and metronidazole.
The Watch Group
Watch group antibiotics are broader in spectrum and carry a higher risk of selecting for resistant bacteria. Because of this, they are prioritized as key targets for stewardship programs and consumption monitoring. Their use should be limited to infections where they provide clear clinical benefits over Access group alternatives. Selected Watch group antibiotics are included in the WHO Model Lists of Essential Medicines for specific indications, but their use is largely confined to hospital settings, often administered by injection. Oral Watch group antibiotics are reserved for a few indications. Examples include ciprofloxacin, ceftriaxone, and azithromycin.
The Reserve Group
The Reserve group comprises antibiotics that should be reserved for the treatment of confirmed or suspected serious infections caused by multidrug-resistant bacteria. These agents must be used only when all alternatives from the Access and Watch groups have failed or are not suitable. Strict monitoring and stewardship are essential to preserve their effectiveness. Reserve group antibiotics are included in the WHO Model Lists of Essential Medicines as last-resort options. Examples include colistin, linezolid, and tigecycline.
Implementation and Antibiotic Stewardship
The AWaRe classification supports antibiotic stewardship programs by giving healthcare providers, pharmacists, and policymakers a common language to discuss antibiotic selection. By categorizing antibiotics into meaningful tiers, the framework facilitates coordination and communication across care settings. Stewardship teams can use AWaRe data to identify overuse of Watch and Reserve agents, set institutional targets, and design interventions to optimise prescribing. The classification also aids in educational efforts, helping prescribers understand why certain antibiotics should be used sparingly.
Case Example: Awareness Campaign in Chittagong
In Bangladesh, the Directorate General of Drug Administration (DGDA) has undertaken efforts to raise awareness about the WHO AWaRe classification among physicians in Chittagong. As part of this initiative, the DGDA distributed an AWaRe poster designed to familiarize prescribers with the three groups and encourage appropriate antibiotic choices. Such local campaigns are critical for translating global classification systems into everyday clinical practice. By equipping healthcare professionals with practical tools and knowledge, these efforts contribute to the broader goal of preserving antibiotic effectiveness and protecting public health.
Conclusion
The WHO AWaRe classification provides a simple yet powerful framework for guiding antibiotic use and combating antimicrobial resistance. Its three-tier structure — Access, Watch, Reserve — helps clinicians choose wisely, stewardship teams monitor effectively, and policymakers set meaningful targets. Ongoing education and awareness campaigns, such as the DGDA initiative in Chittagong, are vital to ensure that the classification reaches prescribers at the point of care. As AMR continues to escalate, tools like AWaRe will remain central to global efforts to sustain the efficacy of existing antibiotics.
References
World Health Organization. AWaRe classification of antibiotics. Geneva: WHO Expert Committee on Selection and Use of Essential Medicines; 2017 (updated every 2 years).
World Health Organization. WHO Model Lists of Essential Medicines. Geneva: WHO; 2023.
Directorate General of Drug Administration (DGDA), Bangladesh. Awareness campaign on WHO AWaRe classification in Chittagong; 2023. (Information from source bundle.)