I've just been informed by a different forum about the dosage:
"I'd maybe pre-mix 1 ml of Baytril with 3 ml of flavoring (making a total of 4 ml). This will adjust the calculations because the new mixture will now have 100 mg of medicine in 4 ml of liquid, or a concentration of 25 mg/ml. According to the calculator, for a dose of 5 mg/lb (11 mg/kg), you'd want to give your rat .3 ml of this mixture. This would be a better portion size."
Would this seem accurate?
I would also just like to note: I understand it's not well to self medicate him, but I'm afraid I don't have any other options. I live in the midwest (AKA a cornfield) where I don't have access to any exotic pets vet. The last time I brought one of my poor ratties to a vet that accepted rats (but by no means was a specialist on them), she prescribed .9 ml of baytril twice a day (I believe it was mixed with a zucchini and sugar mix that made it sweet, but not enough that he would willingly take it. It was also veeery sticky and wouldn't come out of his fur, so it gave him really bad rashes. The skin under his jaw was furless and raw, it was horrible. I really hope it wasn't because the baytril was burning him from being prescribed too much, he was no heavier than my current rat). Sometimes I could get him to take the medication by putting it on a treat, but I could only put very little on it. He got worse very quickly, despite giving the medication twice every day, and passed not even a week later.