Antimicrobial Resistance and Why Antibiotics Are Regulated Tightly

Antimicrobial resistance (AMR) occurs when bacteria, viruses, fungi, and parasites evolve over time to survive the drugs designed to kill them. In the case of antibiotics, which specifically target bacterial infections, resistance means the medicines become less effective. As a result, common infections become harder to treat, and the risk of severe illness and death increases. AMR is a natural biological phenomenon, but human activity has accelerated it significantly. Because resistant bacteria can easily spread between people, animals, and the environment, resistance is not just an individual health issue but a global, population-level concern. This collective risk is why regulators worldwide treat antibiotics as a unique class of medicine, enforcing strict rules around their access, distribution, and use.

How Resistance Develops at a Population Level

Bacteria reproduce rapidly and mutate naturally. When a person takes an antibiotic, the drug kills the bacteria that are susceptible to it. However, if any bacteria carry genetic mutations that make them resistant, they survive the treatment and continue to multiply. This is a basic evolutionary process often described as "survival of the fittest." The surviving resistant bacteria can then pass their resistance genes not only to their direct offspring but also horizontally to neighbouring, unrelated bacteria in the community.

At a population level, the more frequently antibiotics are used—whether in human medicine, agriculture, or veterinary settings—the greater this selection pressure becomes. Selection pressure refers to the environmental advantage given to resistant bacteria over non-resistant ones. As a population consumes more antibiotics, the susceptible bacteria are repeatedly killed off, leaving the resistant strains to dominate. As these resistant strains spread through communities, hospitals, and water systems, infections that were once easily manageable become difficult and expensive to treat, threatening the foundation of modern medicine.

Antibiotic Stewardship Programmes

To slow the development and spread of resistance, health systems globally implement antibiotic stewardship programmes. Stewardship refers to coordinated efforts to measure and improve how antibiotics are prescribed and used. In hospitals, these programmes are generally led by teams of infectious disease specialists and clinical pharmacists who monitor prescribing patterns and provide guidance to other doctors.

The overarching goal of stewardship is to ensure that antibiotics are only used when a bacterial infection is confirmed or strongly suspected, and that the chosen drug targets the specific bacteria involved without causing unnecessary harm to the patient's natural flora. By reducing unnecessary or overly broad antibiotic use, stewardship programmes minimize the selection pressure that drives resistance. They also help preserve the effectiveness of existing antibiotics, an important priority because the development of entirely new antibiotic classes is both a slow and scientifically challenging process. Stewardship ensures that the current arsenal of medicines remains effective for as long as possible.

Why Antibiotics Are Prescription-Only Worldwide

In most countries, antibiotics are classified as prescription-only medicines. This means they cannot be legally dispensed without a valid prescription from a licensed healthcare professional. The primary reason for this tight regulation is to prevent misuse. Common examples of misuse include taking antibiotics for viral infections like the common cold or flu, against which they have no effect, or taking leftover medicines from previous illnesses.

When antibiotics are freely available over the counter, people often self-diagnose incorrectly. Every inappropriate use of an antibiotic contributes to the selection pressure that drives resistance in the wider community. By requiring a prescription, regulators ensure that a trained professional first evaluates whether an antibiotic is necessary, selects the most appropriate one, and monitors the outcome. This regulatory barrier is a cornerstone of global public health efforts to keep antibiotics effective. Unrestricted access not only harms individual patients but also creates resistant strains that can spread to others, making it a matter of public safety rather than just personal choice.

The South African Context and Global Action

In South Africa, antibiotics are tightly controlled under the Medicines and Related Substances Act, which classifies them as Schedule 4 prescription substances. The South African Health Products Regulatory Authority (SAHPRA) oversees this scheduling to align with global standards and national strategies to combat AMR. Tools like HealthSA can be used to verify the registration status of antibiotic products dispensed in South Africa, ensuring that only quality-assured medicines enter the supply chain, which is another vital component of combating resistance.

Globally, the World Health Organization (WHO) maintains a list of critically important antimicrobials to help countries prioritize their regulation and preserve their effectiveness for human medicine. The WHO's global action plan on AMR encourages all countries to adopt strict regulatory frameworks, improve surveillance, and promote public education. By keeping antibiotics prescription-only and supporting stewardship initiatives, regulators aim to balance the need for access to life-saving treatments with the responsibility of safeguarding public health for future generations.