The dolls have been around for over 25 years (originally sold by mail order) but now, as a subsidiary of Mattel, you can have the whole American Girl experience by walking into any number of mall stores in the country.
Aside from restrictions placed on it by the FDA (for instance, it will be sold only through a single mail order pharmacy), the drug causes the buildup of fat in the liver, a warning sign that it may also cause liver damage.