If the name of the main ingredient ends -ine or some variant (-tine, -mine, -nine, -pine,-amine,-grynine), it's best to avoid it--these are all alkaloid poisons. See Posts on CRT about Scopolamine useage in Colombia for details.
Also you get "drug amateurs" coming to CR to spread their wings in that as well as the sex arena,i.e. they don't know what they are doing. Bad stuff ensues. They may have listened to buds who could smell a bad cut from 10 meters but that don't help those guys worth a dookie because they can't.
This guy surely knows what's the deal:
http://www.youtube.com/watch?v=E40IFKrzDIg