Hi Ellie,
Have you ever tried contacting various medical journal or database publishers? They often look for freelancers to write columns, or copy edit, or set up web sites, or review materials, etc. One of my dear friends is a doctor and he does consultancy work for publishers, including drug descriptions, indexing, product comparisons, evidence-based medical reviews, etc. Of course, he worked for a publisher for many years so he also had the contacts in that industry. Also Pharmaceutical companies are busy setting up Patient Information web sites - perhaps they could use some freelance help.

Good luck!
-H2H