I ran across an interesting combination of packaging for some medicine the other day.
The medicine in question was a prescription migraine medication. The exterior, cardboard package that it came in was fairly typical. The interesting part was that the medicine's outer packaging consisted of a thick, foil envelope, and the inner packaging consisted of a thick, foil single blister pack.
Which got me to thinking - both layers of packaging appeared to be equally effective at blocking light and moisture from seeping into the underlying pill. Using such extensive packaging would appear to be more expensive that traditional packaging techniques.
What properties of a chemical (pharmaceutical) intended for general usage (consumption) would merit the double layer of packaging and additional expense? Or to be a bit more specific, what is it about a medication that causes it to need such extensive protections? Or am I completely off-base, and it's more of a manufacturing concern in making sure the pill isn't damaged before being delivered to the consumer?