Antibiotics may be to treat bacterial infections in the GI tract. Infections in Crohn’s disease can include abscesses and fistulas around the anal canal and vagina.
Examples:
Metronidazole
Ampicillin
Ciprofloxacin
References:
1. https://www.crohnscolitisfoundation.org/sites/default/files/2019-02/Updated%20IBD%20Factbook.pdf