Speaking for the US, yes indeed. Loperamide is technically an opioid and available OTC, though that's rarely a sought after compound unless one is in dire straits.
Codeine is available with a pharmacist's approval alone in my state. So while it may not technically OTC by that definition (or is, I don't know how OTC is defined), it can be had without a prescription by visiting a participating pharmacy and simply requesting codeine+guaifenesin. Done it a few times myself.
Codeine is available with a pharmacist's approval alone in my state. So while it may not technically OTC by that definition (or is, I don't know how OTC is defined), it can be had without a prescription by visiting a participating pharmacy and simply requesting codeine+guaifenesin. Done it a few times myself.