I don’t know the numbers for med acceptance success. The Dept of Neuroscience at Pitt doesn’t exist to just serve as a pre-med conduit, so I don’t know if they keep numbers like that or not. You’d have to call them to find out. However, if you come out of Pitt with a BS in Neuroscience and a representative GPA for the med school that you are interested in, you’ll be fine, and you’ll also be better prepared than most for med school.
If you struggle in biology or neuroscience at the undergrad level, (for instance, can’t maintain better than a 3.0 in your science classes) you likely aren’t destined for med school to begin with no matter where you go for your undergraduate.