Rx Vitamins for Pets 1.25 oz. Rx Biotic Probiotics are good bacteria that might work to inhibit the growth of potentially harmful bacteria in the digestive tract Rx Biotic Powder product may help address certain symptoms associated with digestive discomfort such as mild diarrhea constipation or vomiting Contains fructooligosaccharides which are prebiotics that could potentially work to stimulate the growth of probiotic bacteria in your pets gut