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My 16-year-old female Quarter Horse has a runny, snotty nose, a temperature of 100.5°F, and an irregular appetite. Her runny nose got worse over a three-day period, and we're up-to-date on all vaccines. The vet put her on Uniprem twice daily for five days. I mix the medicine with feed and corn oil to make it stick together. She is eating better but now has loose stools. Do I need to worry about the loose stools? If this is a virus, will it just run its course? If it is a bacterial infection, will the medication take care of it? Is the medication causing loose stools?

Last Updated: June 18, 2009

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Antibiotics can cause loose stools. They kill the bad bacteria causing the sickness but also kill good bacteria that are used in the digestive process of the horse. It is sometimes recommended to feed a probiotic along with the antibiotic to help replace the good bacteria that are being killed by the antibiotics. You can continue the probiotics after the antibiotics are finished and monitor the stool. Over the course of a week or so, the stool should get back to normal, and the probiotics can be discontinued. If the stool does not get back to normal, you should consult with your veterinarian.

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