Danged if I know.
That Phar-Mor was a strange place in some ways. For example, one time when I went in to renew Toby's prescription, the price jumped 50%. They'd switched me from pills I had to cut in half to half-strength pills. They told me that they were doing this for my "convenience" -- and wouldn't switch back on the grounds that that's what "the doctor" had told them. Called the vet, who denied telling the pharmacy anything... vet called the pharmacy, and low & behold, I got what I was supposed to.
Pharmacy also told me not to worry about it, my health insurance paid for it anyway. Oh yeah? On a dog? Try again.
No, I didn't switch pharmacies. I would have, but poor Toby died of heart failure before the next renewal would have come up.