I just bought generic metformin, does it work the same as the brand name?

Yes, it works exactly the same! Generics have to meet the same quality and effectiveness standards as brand-name drugs, meaning they contain the same active ingredient in the same dose. The only difference is that generic manufacturers don't spend money on marketing, so they can sell much cheaper, but metformin is metformin, doesn't matter where it comes from. I work in a lab and I'm telling you the quality controls are just as strict, so grab that box with confidence and follow your doctor's instructions without any doubts!