Antibiotics work by killing bacteria faster than they can multiply — but only while the medicine is present in your body at the right level. Stop early, and the toughest, most resistant survivors get a second chance to regrow. That is how resistant infections are made, and it is why the standard advice from doctors and the WHO has stayed the same for decades: complete the full course, even when you feel fine.
Why "I feel better" is a trap
Most symptoms fade well before the bacteria are eliminated. A five-day course of amoxicillin can make a throat infection feel cured by day three — while a meaningful population of bacteria is still alive and now under selective pressure to resist the drug. Finishing the course removes them before resistance can develop.
What to do if you miss a dose
The general rule, consistent with NHS and WHO patient guidance: if you remember soon after the missed time, take the dose; if it is almost time for the next dose, skip the missed one and continue the normal schedule — never double up. The exact rule varies by antibiotic, so always follow the leaflet in the box or your pharmacist's advice.
How to never lose count
Course-length antibiotics (five to fourteen days) are exactly where reminders earn their keep:
- Scan the prescription the day it is written so the full course is in the app from day one.
- Match dose times to meals: "after food" antibiotics like many amoxicillin regimens are easiest to remember tied to breakfast and dinner.
- Mark each dose as taken; seeing "day 4 of 7" is powerful motivation to close out the course.
The bigger picture
Antimicrobial resistance is projected by the WHO to be one of the leading causes of death worldwide this decade. Every completed course, every non-shared antibiotic, and every honest conversation with a doctor about whether an infection is even bacterial (antibiotics do nothing for viruses like the common cold) is part of the solution.
The rule in one line: the day you feel better is the middle of the course, not the end of it.
Frequently asked questions
What happens if I stop antibiotics early?
Surviving bacteria can regrow and become resistant to the antibiotic, making future infections harder to treat. Always complete the full prescribed course unless your doctor tells you otherwise.
What should I do if I miss one antibiotic dose?
Generally: take it when you remember unless the next dose is close, in which case skip it — never take a double dose. Check the leaflet in the box or ask your pharmacist, since rules vary by medicine.
Do antibiotics work on viral infections like the flu?
No. Antibiotics kill bacteria only. Colds, flu, and most sore throats are viral, so antibiotics will not help and only add side-effect risk and resistance pressure.