Watching for a stumbling gate could be tricky - he's in an awkward/uncoordinated phase of growth right now...but I will keep a close eye out for anything out of the ordinary!
He was prescribed both meds due to a bacterial infection in his gut that was causing him some fairly awful diarrhea, and he had an elevated temp, as well. However, they did not mention ANY risk of giving it to a growing pup, which is what I find frustrating. It's one thing to know that there are risks, but that they feel the good outweighs the bad...it's another to not even bother mentioning it, in my opinion.
On the bright side, he does seem to be doing better and is back to solid poop, as opposed to diarrhea every 20 minutes!