🐱 Cat on Antibiotics? Here's How to Protect Their Gut Microbiome

Antibiotics can be an important tool for treating bacterial infections, such as urinary tract, ear, respiratory, skin, and eye infections. But they come with a real cost: antibiotics can't tell the difference between the "bad" bacteria causing the infection and the "good" bacteria that keep your cat healthy, so they wipe out both. For some cats, that leads to diarrhea right away, and for others it can contribute to an ongoing microbiome  imbalance that can surface later as chronic diarrhea, vomiting, or constipation.

During treatment:

Give the probiotic S. boulardii**.** This is the piece most people miss when taking care of their cat, as most probiotics are bacteria, so the antibiotic kills them too. S. boulardii is a beneficial yeast, so antibiotics don't affect it. In one study of dogs on antibiotics, none of the dogs given S. boulardii developed diarrhea, and 75% of dogs not given S. boulardii did develop diarrhea. (Diarrhea lasted an average of 7 days.) S. boulardii + FOS Powder pairs the beneficial yeast with prebiotic fiber that feeds the S. boulardii. 

Support their appetite. Antibiotics can cause nausea and lethargy. Keep your cat eating — if needed, warm the food to release the aroma, or add onion-free, low-sodium broth. Don't force it; wait and re-offer.

Finish the entire antibiotic course. It's tempting to stop once symptoms improve, but stopping early breeds antibiotic-resistant bacteria. And since most microbiome damage happens in the first 24 hours anyway, the benefits of finishing outweigh the risks.

After treatment:

• Add a prebiotic (inulin, psyllium, FOS) to restore good bacteria to healthy levels.
• Test for an imbalance. A Gut Microbiome Test for Cats can show whether the gut recovered, as well as provide tailored diet and supplement recommendations.
• Restore if needed. When diet and probiotics aren't enough, Gut Restore for Cats uses oral FMT capsules, shown to be as effective as an enema, to reintroduce a complete, balanced microbial community.

⚠️ Antibiotics have their place, but overuse drives resistance and can cause further harm to an already-imbalanced gut. Ask your vet whether they're truly necessary, and about an antimicrobial stewardship approach.

Happy to answer questions in the comments. A full vet-reviewed writeup with more details is available here: https://www.animalbiome.com/blogs/cat/how-to-support-your-cat-s-gut-microbiome-during-after-antibiotics