Warfarin - yes but that's not really what the advert is about.
This is primarilly aimed at the sort of pharmacutical sales that you see in spam e-mails. Because of the NHS in the UK most of the take up from here is in terms of stuff like viagra.
In the US there are huge numbers of people who simply can't get or can't afford insurance so fall prey to this sort of scam.
Some of these drugs originate in India where they have a lax patent system - (a drug can't be patented just it's method of production) - but many are simply fake with no active ingrediants and in a few cases worse stuff (hence the ad)
The Advertising standards comission got a lot of complaints but backed Pfizer who made the ad
http://www.guardian.c...zer-fake-drugs-rat-ad