Just off hand my first question would be how do you ensure the meds get to the right place (right stomach) using the method described?
My second question would be how do you know this med does not affect the natural probios for the calf? Is there any test data?
It is possible there is no negative consequences to using this but I would not take that chance. A bovine digestive system works different than a human's.
Scours meds are cheap enough as is. Probably cheaper than pepto. The meds designed for bovines work great and there is plenty of test results to ensure no negative side affects. Grafted calves and bottle calves do fine on the meds we purchase. I have no need to take a chance with something different that I have no certainty with.
Probably would be best to ask a vet.