The US does allow for "off-label" prescriptions. The question then is : will your insurance pay for it. In my case, even though I am diabetic, they wouldn't cover Ozempic, or, apparently even Trulicity, which is just absurd (or Rybelsus which is the oral form of Semaglutide which they DID cover for a full year before putting me on Ozempic for like 2 months, and then denying (after the "new formularies" are approved and I get to be forced and switch to a med they still claimed to cover but not, apparently - I'm assuming they want me to appeal and give a whole run around on that.
But yeah... Technically it's for Diabetes only, but if you have good insurance, they'll probably hand out for any reason (see: "Hottest Celebrity Weight Loss Drug" for example; maybe that's changed now that Wegovy is released/authorized for weight loss)