Although this is coming quite a bit time later, I think I can help answer your question.
As for my background, I'm graduating with a professional PharmD in 2014 and I am applying to PhD programs in pharmacology currently. Therefore, I should be able to help clarify what programs are looking for from a research prospective and the advantages/disadvantages of being a professional healthcare worker.
1) Pharmacology programs are generally not interested in your work experience from a clinical point of view, because pharmacologists are not clinicians. They are concerned about your aptitude in a lab, ability to scientifically write and your ability to reason. Pharmacists are great about knowing mechanisms of action and the pharmacology of useful drugs, but oftentimes that is superficial to the level of research currently in pharmacology. However, it's a huge positive over undergraduate applicants, because your understanding of cell biology is much deeper than most.
2) Lab experience is the quintessential attribute to many applicants- It shows a degree of familiarity with the scientific process and if you have experience with lab methods such as: western blotting, cell culturing, animal breeding, genotyping, etc. If you are a pharmacist with no lab experience, try and slant your SOP towards why you want to go into research and your willingness to really dive deep, despite your lack of lab history. Additionally, maybe apply for some jobs in labs over a summer as a lab technician or doing part time animal breeding for local institutions to get a small "in" that can also help with point 3.
3) Letters of recommendation are important to vouch for your academic abilities, work ethic and aptitude in the field. You might be far removed from professors, lab mentors or departments that can offer a solid letter on your behalf. Some schools prefer that you do not have letters from anybody other than those from academia. So finding someone that really knows you from these areas may be a challenge 5 years out from school.
In terms of pharmacology, some of the largest fields currently are cancer biology, genetics/epigenetics, neuropharmacology among many others.
I don't mean to sound negative or like it will be too large a challenge, I just want to give you a realistic view into the hurdles associated with pharmacology. I wish you good luck and the best let me know if you ahve any questions