Well not particularly medicine, but I was keen on medical science itself - the idea of helping others interests me a lot, which I guess can be done in any job, but I wanted to have international work and correspondence overseas, which is much more likely through law too. I really loved my Philosophy course I did in the HSC, and while I wouldn't take an Arts degree to do Philo, Law is a great substitute I think because of all the analytical thinking, cases, ethics and morals.
I'd be combining that with science though, which I'd keep medical or psychological or something (I've always been interested in Psychological science/Neurology).