I'm not thinking about doing it myself, I was just interested to find out if anyone knows anything about it - I've seen a few requests for medical writers on genuine job websites, I don't think that it is a scam.
Looks highly technical to me, you'd probably need a clinical background:
Medical Writer You will prepare accurate scientific content for a range of medical communications materials in order to satisfy internal editorial and account standards and external client needs in terms of quality, focus and timing