[floxy]

You might know that it was stored properly, but the pharmacy doesn't know it wasn't kept in a parked car that got hotter than the medication can normally tolerate, degrading it. Or whatever. So the chain-of-custody so-to-speak was broken. Maybe for most medications it would be fine, but it seems sensible to not offer refunds. Wouldn't even be surprised if there were federal and state laws preventing the re-use of second-hand medications. Have you successfully tried returning medications elsewhere? Even for over the counter items like Tylenol, if a store does accept returns as a courtesy, I wouldn't be surprised to learn that they just throw it away, rather than take the risk of putting the item back on the shelf.

https://carecard.com/blog/can-medicine-be-left-in-a-hot-car