Many of us know Quiapo as the place where there are a lot of bus terminals - it's not the nicest part of Manila and you need to be very alert if you are a foreigner there. Indeed it probably is not a place where a foreigner should go on his, let alone her, own.
The Wikipedia entry even mentions the stuff sold outside the church... everybody knows that is the place to go for
these "medicines"
http://en.wikipedia.org/wiki/Quiapo_Church
Two products sold outside the church...
The pills are said to be "more reliable" - those in the picture appear to be genuine, or at least the packaging is right.
http://en.wikipedia.org/wiki/Misoprosto