(n) the benefits and risks of using antibiotics to manage bacterial…

The idea

Antibiotics treat bacterial infection by targeting bacterial structures or processes, such as cell-wall synthesis or protein synthesis, that human cells lack. Benefits: they cure or control infections like tuberculosis and sepsis, reduce complications and transmission, and enable surgery and immunosuppression. Risks: they do not affect viruses, so misuse for viral illness is ineffective; side effects range from gut disturbance to allergic reaction; and selection pressure favours resistant bacteria. Overuse and incomplete courses increase resistant strains such as MRSA, and broad-spectrum drugs can disrupt normal flora. Managing risk means prescribing only when a bacterial cause is likely, choosing the narrowest effective agent, completing the course and applying infection-control measures.

What earns the marks

• Antibiotics target bacterial-specific structures or processes (for example cell-wall synthesis or protein synthesis) that human cells lack, giving selective action against bacteria.
• Benefits include curing or controlling bacterial infections, reducing complications and transmission, and supporting procedures such as surgery or immunosuppression.
• Antibiotics are ineffective against viruses, so prescribing them for viral illness gives no benefit and wastes the drug.
• Risks include side effects (for example gut disturbance or allergic reaction) and disruption of normal flora by broad-spectrum agents.
• Selection pressure from antibiotic use favours resistant bacteria, so overuse and incomplete courses increase resistance such as MRSA.
• Managing risk involves prescribing only when a bacterial cause is likely, using the narrowest effective agent, completing the course and applying infection control.

Common mistakes and how to put them right

• Assuming antibiotics work against all infections including viral ones.

  Put it right: They act only on bacteria, so viral illness is unaffected.

• Believing that stopping a course early is harmless once symptoms ease.

  Put it right: Surviving bacteria may be the more resistant ones, so completing the prescribed course reduces selection for resistance.

• Treating resistance as a property the patient develops rather than the bacterial population.

  Put it right: Resistance arises in bacteria through selection, not in human cells.

Exam tips

• When asked about benefits, link each to a specific bacterial target or clinical outcome rather than saying only that it 'kills germs'.
• For risks, distinguish side effects to the patient from the wider problem of resistance in bacterial populations.
• Use precise terms such as 'selection pressure' and 'broad-spectrum' to show understanding of how resistance develops.