Originally Posted by houseflipper
I was told dark cool place (not freezing). Refrigerator in a black plastic bag for mine, if I had any.
Many of the ingredients in antibiotics involve freezing in the prep process. For the most part, it won't hurt them. Obviously, there are bound to be exceptions. Rather than a plastic bag, consider something like a container with a rubber gasket and some of the silica crystals in it. You really need to keep the moisture off of them or that cold does little good.