Here is the thread that I was trying to find. It was Taylor's dog:
http://www.yorkietalk.com/forums/sic...ack-issue.html
It wasn't exactly the same as Oti-Pack E, but it's similar. From what I've read, permanent deafness is a rare side effect, but your vet should have at least mentioned it as a possible side effect. Oti-Pack E isn't made by a regular pharmaceutical company--it's compounded by a veterinary pharmacy in Phoenix, Arizona and sold to veterinarians:
https://www.roadrunnerpharmacy.com/i...l%20EDITED.pdf