Some antibiotics can cause or worsen reflux symptoms, through a couple of different mechanisms depending on the specific medication.
Direct irritation
Certain antibiotics, particularly some taken as large pills, can irritate the esophagus directly if they don't fully clear it before dissolving — this is why it's generally recommended to take pills with a full glass of water and remain upright for a period afterward, especially with certain antibiotic classes known for this effect.
Effects on gut bacteria
Antibiotics disrupt the normal balance of gut bacteria, which can contribute to bloating, altered digestion, and in some people, temporary reflux-like symptoms as the digestive system adjusts. This effect is usually temporary and resolves as gut bacteria rebalance after finishing the course.
What to do if this happens
Staying upright for at least thirty minutes after taking oral antibiotics, taking them with adequate water, and not lying down immediately afterward reduces the direct irritation risk. If reflux symptoms are significant or persist well after finishing a course of antibiotics, it's worth mentioning to the prescribing doctor, since alternatives or additional guidance may be available.
