Doctors are needed literally everywhere, so yes, it's one of the few things that pretty much guarantees you a job, as long as you can move to where you're needed (although considering the shortages of NHS staff at the moment, you still shouldn't have to move too far).
The website that lets you plug in A level choices and get given certain degrees they will allow you to do (I think it was Which?) gave medicine graduates an employment rate of 99%, whereas pretty much all of the other degrees' employment rates ranged from about 70% to 90%.