Your gut is full of friendly bacteria that help you digest your food and keep everything running smoothly and efficiency. This vast community of bacteria is called a gut microbiome. People with gut problems like inflammatory bowel disease and irritable bowel syndrome tend to have a much less diverse gut micribiome. Taking a broad spectrum antibiotic can devastate your gut microbiome, letting the bad bacteria thrive while the good ones are offstage, sometimes leading to some of the same symptoms that people with IBD and IBS might encounter, and it can take months to recover.

Killing 50% of all living things might include 50% of gut microbia, resulting in the potential for bloating, gassiness, stomach cramps, and potentially diarrhoea.