Can you legally buy Lortab/Vicodin in Mexico?

[Sincere]

I will be visiting Cozumel Mexico next week. My doctor prescribes me Lortabs because I have cronic lower back pain and inflammation but sometimes he can be a little stingy and plus I have to pay for office visits everytime I need a refill. I've heard about pharmacys down their where you can get anything but didnt know if it was true. If it is I was planning on just stocking up on some (just a good amount for personal use, not a whole suitcase or anything, Im not a dealer or planning on selling them) , but was curious and cautious about the legality of buying it an bringing it back to the US. I will also be visiting Belize City too and dont know anything about that place, any info and advice would be appreciated.