Amoxicillin is a staple for children, yet many ear infections don't need it
Amoxicillin is among the antibiotics most often given to children, with over 23 million US prescriptions in 2023. Yet most children older than two with a middle ear infection gain nothing from antibiotics, and most sinus infections are viral, where the drug does nothing and side effects can outweigh any small benefit.
Discovered in 1958, amoxicillin entered medicine in 1972; the brand Amoxil was approved in the United States in 1974 and in Britain in 1977. It belongs to the aminopenicillins, part of the penicillin family, and is usually the preferred member of that group because the gut absorbs it better than its relatives. The WHO counts it among essential medicines, and cheap generic versions are everywhere.
Its targets span ear and throat infections, pneumonia, urinary and skin infections, Lyme disease and more. Britain's health guidance body favours it as the first treatment for community-acquired pneumonia in adults, and research suggests it matches the broader-spectrum co-amoxiclav in hospital patients whatever the severity. For stomach infections by Helicobacter pylori it works as one piece of a multi-drug combination. The WHO also recommends it for infants with pneumonia signs in poor settings when families cannot or will not accept hospital care.
Bacteria fight back. Species that make beta-lactamase enzymes can break the drug down, so it is often paired with clavulanic acid, which blocks those enzymes. Organisms such as Klebsiella and Pseudomonas aeruginosa resist it outright, while some E. coli and most clinical Staphylococcus aureus strains have acquired resistance to varying degrees.
Practice around it has shifted. Ear infections were once treated with three doses a day, which led to missed doses; twice or even once daily now appears equally effective. Nausea and rash are the usual side effects, and people allergic to penicillin should not take it. Allergic reactions can arrive suddenly and severely, and very high blood levels, above 110 mg per litre, have been linked to nerve toxicity.
Source: Amoxicillin
