I use the same as Staci, but I just got a prescription for Retin A & pick it up from the pharmacy today. I store mine at room temp. The packaging already blocks the sun, but a dark cool cupboard would be great!
Whatever retinal you choose should be in a tube, not a jar. Sunlight breaks it down.
I use an OTC brand (Verso brand) and never store them in the fridge. They come in a plastic container with a pump. The cream is actually vacuum-sealed in a bag inside the tube so it gets every last drop of it (not like the conventional packaging where the cream stay at the bottom)