I thought some people on this list might ffind this website useful. It is a collection of images of medical advertising from the early twentieth century and on, including some ads that illustrate packaging. perhaps more interesting (to me, anyway), is how the products were marketed. you may find it can shed light on consumer behavior if you have a site that produces a lot of one kind of medical product. the website is searchable by name of product, and can be browsed by category, year, etc. Very interesting stuff!
 
http://scriptorium.lib.duke.edu/mma/