Both of my boys are no syringe. I always cut up a baby carrot and squirt it on the pieces, or I squirt it over their greens. Bombur is currently on 28 days of medicine for EC, and I coat his greens in it. Little man eats it every time. He’s also like your bun and has had stasis and enterotoxemia, so I’m overly cautious with him.

Has he ever been given probiotics in addition to antibiotics when he’s on them? By nature, any antibiotic will give a rabbit gastric distress because it can kill off their gut bacteria (needed to properly digest/process food). During a course of antibiotics, a rabbit should also take probiotic (typically a powder you sprinkle on a wet veggie), and this replenishes the gut bacteria which may have been loss by the antibiotics. If you were never given a probiotic, in the future, I recommend bringing it up to your vet so gastric distress can be mitigated. Some rabbits can handle antibiotics without probiotics, but having the pair is a good idea, especially for sensitive rabbits. Some rabbits are also just more sensitive to some antibiotics than others. Wick gets immediate gastric distress from Flagyl, despite being on probiotics at the same time. However, Bactrim, Baytril, Flocillin, and itraconazole (all antibiotics) have treated his stomach fine, as he’s always on probiotics when prescribed them.

I made a video a while back of how I do oral syringe administration on Wick. http://www.youtube.com/watch?v=N12eJ5vdo4w . You can see he definitely thrashes and tries to get away, but the ordeal is over pretty quickly. Every rabbit will have a preference/best way to do it, so if you find one approach doesn’t work, try another.

Feeding a treat right after a successful administration is very very very helpful too. Once the rabbit learns the connection, they are a bit better with it, at least with my Wick’s experiences in mind.