I agree that OTC pills probably are not harmed by occasional freezing temps. I don't know about ointments or liquids (eye drops) but they would obviously be difficult to use while frozen. I keep all my meds in a small zippered pouch so that in cold temps I can remove it from my pack and carry it in my pocket. Just remember to put the ointments in individual, sturdy zip locks (sunscreen as well) because they absolutely will leak eventualy.
leo