Selling Incorrect Medication

I asked the pharmacist for Corsodyl and she said they do not have it but they have Oranix Oral Rinse and she assured me it was the same thing. When I got home my wife said she can't use it as it has alcohol in and she can't use anything with alcohole in as she is a recovering alcoholic. I then took it back and the pharmacist said they can't take the medication back because it's the law. Then the pharmacist should say sorry we made the mistake we will give you your money back and dispose of the mouth wash or you can keep it.