Why do I get a metallic taste on antibiotics?

You are not imagining it, and you are not alone: a metallic taste is a recognised side effect of several common antibiotics, with metronidazole the famous one - the NHS names it directly on its metallic taste page - and clarithromycin in the same club. The drug circulates in your blood and some of it enters your saliva, where your taste receptors read it as metal; with certain antibiotics the taste arrives within hours of the first dose and parks itself until the course ends. Annoying, harmless, and completely temporary - the taste typically clears within days of the last tablet as the drug leaves your system. The one rule that matters: do not stop the antibiotic because of the taste. The NHS is explicit - speak to a pharmacist for advice, but do not stop taking a prescribed medicine without medical advice. A half-finished antibiotic course is how resistant infections and bounce-back illnesses happen, and there are easier ways through the week: strong-flavoured foods and drinks to mask it (the NHS suggests stronger-tasting food and boiled sweets for the same problem in chemotherapy), mints or sugar-free gum between doses, cold water with lemon, and scrupulous tooth-brushing including the tongue. If the taste is unbearable, your prescriber can sometimes swap to a different antibiotic - that is a reasonable phone call, not a fuss. And if the metallic taste started before the antibiotics, or outlasts the course by more than a week or two, that is a different workup - gum disease, sinus trouble, and reflux are the usual suspects. Pymander is a free AI doctor, 24/7 by text, that can help you weigh the options.