I'm working at Lloyd's Pharmacy and just spent 6 months doing a course and now I'm a Health Care Assistant. In April I'm going to be training to become a Dispenser which I think takes about 6 - 8 months. You could try looking for a job in a pharmacy, whether it be somewhere like Tesco, Asda or even an independant one. If by Dispenser of Medicine you mean somebody bringing in their prescription and you getting the items on it then that's what you'll need to do. It's not something I'd recommend as a career choice though, if you're interested in Pharmacology you should study it at Uni. I'm only working at Lloyd's part time while I do my A levels.
Hope I helped.
Hope I helped.