How Antibiotics Affect Gut Bacteria

Antibiotics work by killing or inhibiting bacteria — but they generally can't distinguish between harmful bacteria causing an infection and the beneficial bacteria living in your gut.

Broad-spectrum vs. narrow-spectrum

Broad-spectrum antibiotics affect a wider range of bacteria, often causing more significant gut disruption than narrow-spectrum options targeted at specific bacteria.

What disruption looks like

Reduced microbial diversity and temporary overgrowth of certain bacteria or yeast can occur, sometimes causing digestive upset or other symptoms.

Recovery is generally expected

For most healthy people, gut bacteria diversity substantially recovers over weeks to months, especially with supportive steps like probiotics and a fiber-rich diet.

This content is for educational purposes only and is not a substitute for professional medical advice. Check with a doctor or pharmacist before starting probiotics or making changes to prescribed antibiotic treatment.