About 2 years ago he was bitten by our other cat on the rear upper leg/stomach? area and developed a severe infection, for which he was prescribed liquid Clindamycin. This helped him recover from lethargy and his infection but resulted in severe watery, extremely foul smelling, diarrhea mostly outside of the litter box for several months. After a while we took him to the vet to get his stool checked, it came back positive for Giardia. Possible C-Diff from the Clindamycin, very common.
We gave him 50 mg of metronidazole for for 2 weeks twice a day... feeding him canned rabbit mixed with pumpkin and one half of a crushed Spectra pro-biotic pill. He seemed to recover completely, gaining weight and normal formed stools :))
We continued giving him probiotics in his food for the next 3 weeks after treatment. Sadly, after we stopped, the diarrhea came back. Tried to give probiotics again, but to no avail. He continued to have foul smelling diarrhea with 50% litter box use, no blood in stool.
Other pertinent test results
We decided to give him liquid Fenbendazole 1.8ml mixed with food daily to possibly get rid of a recurrent Giardia. Replaced his litter box, protected the carpets with plastic, isolated from other cat. No improvement after 1.5 weeks of treatment. Cat seems fine, is playful, eats, and sleeps in normal area, but looks thin, as usual, since the treatment with Clindamycin :(
This completes his history. Now we are trying to give him Metronidazole again. I gave him two pills so far for one day and this third day he threw it up with the pinkish throw up a little more red colored as he threw up more. He also threw up the pill along with this.
Giardia and C. difficile infections certainly can cause diarrhea and vomiting however they are not the most common causes. Metronidazole has been prescribed as a general anti-diarrhea medication however I would be concerned that your cat is vomiting as well. When I see older cats with GI signs I become concerned with IBD (inflammatory bowel disease) as well as unfortunately cancer. A series of radiographs and blood tests should be performed.
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