Updated September 25, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: FortiFlora Feline is a probiotic powder containing Enterococcus faecium strain SF68, sprinkled on food. Studies in shelter cats found this strain reduced diarrhea, and vets commonly use it during diet changes, antibiotic courses, stress, or bouts of soft stool. Many cats also find it tasty, which can help picky eaters. It’s a supportive product, not a treatment for serious diarrhea.
When vets may suggest it
- Mild diarrhea or soft stool
- During or after antibiotics
- Stressful events like boarding or moving
- Diet transitions
Evidence
A study in shelter cats found fewer days of diarrhea in cats given this strain. Probiotic effects are strain-specific, so results from one product don’t apply to all probiotics.
See a vet instead if
- Diarrhea lasts more than a day or two
- There’s blood, vomiting, or lethargy
- Your cat stops eating
- A kitten has diarrhea
Alternatives
- Other veterinary probiotics with studied strains
- Fiber supplements for some cats with large-bowel diarrhea
- Gastrointestinal prescription diets
Sources
- Bybee SN, Scorza AV, Lappin MR. Effect of the probiotic Enterococcus faecium SF68 on presence of diarrhea in cats and dogs housed in an animal shelter. J Vet Intern Med. 2011
- Purina Pro Plan Veterinary Diets: FortiFlora product information
- Cornell Feline Health Center: Diarrhea in cats
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.