Can you take an over-the-counter proton pump inhibitor continuously for gerd?

Same as prescription: You need to see your doc to figure out what you have, why you need to be on such a med, if other less potent meds will work as well, or if they are needed at all. In general, the lowest dose, of the least potent medicine, for the shortest period of time to do the job is a good approach. You can't figure that out without your doc.