[QUOTE=skyy;4541291]
Metronidazole is an antibiotic used to treat specific causes of diarrhea (ie chlostridium and other bacteria). It doesn’t treat the diarrhea per se. Diarrhea can be caused by many things for which you don’t need an antibiotic. I have only seen it come in pill form which ends up needing to be ground, mixed with water and orally syringed because it tastes so bad. It puts many horses off of their feed so you want to syringe it after they have eaten.
Edited to add: even if you have access to metro, you should not start treatment without having your horse examined by your vet or at least speaking to them. As for the Bio Sponge, please be careful with that too. It is very useful but treatment can quickly go the other way and you can end up with an impaction. Especially with an older horse, I would not start it without consulting a vet.[/QUOTE]
skyy, thanks for the information. I know it’s antibiotic that can help when the bowel gets inflamed as I did google it and there is some good info on it. Don’t worry, as soon as the vet practice opens tomorrow, they will get a call. The one vet is about as fond of the old geezer as I am if not more so as she’s treated him pretty much for a good 15 or more years. This will only be the 3rd winter and 2 summers that I’ve had him. 
But I’ll be very honest here, if I can’t get this guy’s squirts and diarrhea cleared up and under control, it’s pretty much the end of the line for him. He doesn’t have a leg to stand on, has RAO (heaves), and Cushing’s. I went thru this last winter and trying to clean his butt is no fun at all when the temps are single digits and teens.
It took just about all summer to gain back the weight he lost through January to about March not to mention trying to get all the Vaseline out of his tail from coating his butt with it. Even with his tail done up in a mud tail it still got all gooey. 