Everything You Believe About Taking a Full Course of Antibiotics and Bacterial Resistance Is Wrong

Short antibiotic courses may be just as effective as longer ones, according to a 2023 review of over 120 clinical trials. This challenges the long-held belief that patients must always complete the full course of antibiotics to prevent the development of bacterial resistance. Experts now believe that shorter courses could actually decrease resistance, as the longer the exposure to antibiotics, the greater the selective pressure driving resistance.

Despite this, many people still believe that taking a full course is essential, even if they feel better. In a survey of over 1,400 adults, nearly 90 percent of respondents said it was always best to take the full course of antimicrobial medications, even when they were no longer symptomatic. Around 60 percent of respondents actually preferred a longer course of antibiotics for conditions such as pneumonia.

The contradiction between medical advice and public opinion raises the question of how to change the widespread practice of completing full courses of antibiotics. The authors of the review suggest that doctors should be more flexible in their messaging about antibiotic use, acknowledging that new evidence and evolving guidance on antibiotic use are normal and a sign that the medical community is working to improve care.

They emphasize the importance of updating public communication about antibiotic use to reflect the latest scientific findings.