that looks an awful lot like an extensible "type/value" structure to me, eh
Yes, I did realise that even as I posted it! But I would argue that it is more of a supertype/subtype design that an EAV model really!
I don't know what it is about the Healthcare and Pharmaceutical world that it seems to find EAV so beguiling. I mean, is it that they actually face a different situation from the rest of us where full-on flexibility is paramount, or is it just a culture thing - i.e. all the database designers in that industry pick up the EAV idea from each other like a, er, virus...?