How are new antibiotics developed?

New antibiotics are developed through a process of scientific research, testing, and regulatory approval.

The development of new antibiotics begins with the identification of potential antibacterial agents. This can be achieved through various methods such as screening natural products, modifying existing drugs, or designing new synthetic compounds. Scientists often look to nature for inspiration, as many antibiotics are derived from substances produced by fungi or bacteria. For instance, penicillin was discovered from a mould called Penicillium notatum.

Once a potential antibiotic is identified, it undergoes laboratory testing to determine its effectiveness against various types of bacteria. This involves growing bacteria in a controlled environment and exposing them to the potential antibiotic. The aim is to find a compound that can kill or inhibit the growth of bacteria without causing harm to human cells.

If the compound shows promise in laboratory tests, it then moves on to animal testing. This is to evaluate the safety and efficacy of the potential antibiotic in a living organism. The results from these tests can provide valuable information about the appropriate dosage and potential side effects.

Following successful animal testing, the potential antibiotic undergoes clinical trials in humans. These trials are conducted in several phases, each with an increasing number of participants. The aim is to further evaluate the safety and effectiveness of the drug, as well as to identify any adverse reactions.

The final step in the development of a new antibiotic is regulatory approval. In the UK, this is granted by the Medicines and Healthcare products Regulatory Agency (MHRA). The MHRA reviews the data from the clinical trials and decides whether the benefits of the new antibiotic outweigh the risks. If approved, the antibiotic can then be manufactured and distributed for use in healthcare settings.

It's important to note that the development of new antibiotics is a lengthy and costly process, often taking many years and millions of pounds. This is due to the rigorous testing and regulatory requirements that ensure the safety and efficacy of the drugs. Despite these challenges, the development of new antibiotics is crucial in the fight against antibiotic-resistant bacteria.