I just came back from Cabo a month ago, and I can tell with you with absolute certainty that hydrocodone is not sold otc in mexico, or with a prescription in mexico. It is only sold there illegally, and usually comes from the us. Oxy's used to be sold otc there until a few years ago, when the mexi government started cracking down on the cartels. Opana, oxycontin, and morphine can only be prescribed and dispensed if stamped by a government health official. The primary stable for pain are tramadol, and some other shiz. Now that being said, you can get just about any opiate you want in mexico, a lot of times in the pharmacies; but it is definitely not legal.