A pharmacy job sounds good for Medicine, but is it really? You may gain a limited familiarity with some drugs and what they are used for, if you bothered to, but even that information would not even scratch the surface of the drug studies you do for Medicine, and doesn't make you a stronger applicant. The type of work you'd be doing at this level would probably consist of tidying, finding things and cleaning things.
Of course, like any job, working in a pharmacy would hopefully develop some skills like teamwork, organisation, awareness of relevant legislation and speaking to customers, but don't go too far out of your way to get this from a pharmacy. I put in my PS that I worked as a lifeguard and I milked cows... They spent a good 5 minutes at one of my successful interviews asking me about milking cows. So, if it's not too much bother, go for the pharmacy, it will benefit your application if you use it well. However, anything else would work just as well.