The request comes up constantly: a week of cough and blocked nose, and a reasonable ask for something stronger. Refusing feels to the patient like being denied treatment. It is worth explaining what is actually going on, because the reasoning is not arbitrary.
Antibiotics have specific targets that viruses do not have
Antibiotics work by attacking structures and processes that bacteria possess — cell wall construction, bacterial ribosomes, bacterial DNA replication machinery. Viruses have none of these. A virus is essentially genetic material in a protein coat that hijacks your own cells to reproduce. There is simply nothing there for the antibiotic to bind to. Taking one for a viral infection is not a weak treatment; it is not a treatment.
The overwhelming majority of what people ask antibiotics for is viral
Common colds are viral. The great majority of sore throats, acute bronchitis, and coughs are viral. Most sinus congestion in the first week is viral. Flu is viral. These illnesses reliably last longer than people expect — a cough can persist for two to three weeks after everything else clears — and that long tail is exactly what drives people back to ask for something stronger.
The cost is not abstract, and you pay it yourself
Antibiotic resistance is usually discussed as a global problem, which makes it easy to dismiss. But the effect is also personal and near-term. A course of antibiotics disrupts your gut flora for weeks to months, and can cause diarrhoea, thrush, and in some cases a serious gut infection. It also selects for resistant bacteria in your own body, so that a future infection that genuinely needs treating is harder to treat. You are spending something real for zero benefit.
What does suggest a bacterial infection
Symptoms that clearly improve and then sharply worsen. Fever that starts several days into an illness rather than at the beginning. Localised, one-sided facial pain with sinus symptoms beyond ten days. A sore throat with high fever, swollen tender neck glands, and no cough at all. Productive cough with breathlessness and chest pain. These patterns are why the assessment matters — the decision is made on the shape of the illness, not on how long you have been miserable.
What actually helps a viral illness
Rest, fluids, and time. Paracetamol or ibuprofen for aches and fever. Saline nasal rinses for congestion. Honey has reasonable evidence for cough in adults and children over one year. None of this is exciting, which is precisely why antibiotics remain attractive.
This article is educational. If your illness is worsening rather than slowly improving, or you have breathing difficulty, chest pain, or a high fever that will not settle, see a doctor for an assessment rather than deciding either way on your own.