Otc meclizine twice a day for a couple years now. id like to wean off. how should i do so?

It is not an additive medication and would not cause withdrawal. For info: https://medlineplus.gov/druginfo/meds/a682548.html

It has to do with your symptoms and reasons for why you had to take it for so long. If prescribed, your prescriber will be best to clarify, there should not be significant withdrawal symptoms if stopped other than reappearance of symptoms you were taking it for.