Is it safe to take all those Antibiotics together???? I don't know ... maybe someone else on here has done it before and will chime in.
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If your vet definitely thinks your rabbit has a urinary tract infection I would give him that UTI drug right away. Because Urinary infections are very very painful and I think the pain from that could be what is making his him not drink water, and stress from pain could be the cause gut issues too.
You can look up antibiotics to see if they are safe here
https://rabbit.org/health/antibiotics.html
I looked it up and Metronidazole and Trimethoprim+ Sulfamethoxazole all say low risk for diarrhea— so they sound safe and also commonly given to rabbits.
It sounds like Ofloxacin is an eyedrop?
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Also, about he liquid cecotropes.
Are sure he doesn't have diarrhea? If he has solid round poos and then liquid cecos that's not diarrhea– so if poos are solid I might hold off on the metronidazole and see how the UTI meds work for him first. But if he has mushy poo all the time I would give the metronidazole right away.
Metronidazole—I think Your vet must think he has some bacteria or coccidiosis protozoal infection based on what's below.
http://vetbook.org/wiki/rabbit/index.php?title=Metronidazole
"Metronidazole is a commonly used benzimidazole drug in rabbits, effective in treating anaerobic bacterial and
protozoal infections.
It is most commonly used to treat anaerobic infections associated with
dental infections and
coccidiosis with good clinical results.
Metronidazole kills target organisms by inducing formation of reactive intemediates within these organisms, resulting in disruption of DNA. Standard oral daily dosing with metronidazole for 7 days disrupts DNA (genotoxicity). This genotoxicity appears to resolve within 7 days of discontinuing drug administration. Additionally, metronidaole does not appear to be cytotoxic to lymphocytes at standard oral concentrations.
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