Ayahuasca is a powerfully psychedelic South American brew traditionally made from the B. caapi vine and admixtures such as P. viridis (and/or other DMT-containing plants). One of its primary effects is considered to be the vomiting (the purge) that accompanies the experience. The term ayahuasca is sometimes loosely used to mean any combination of an MAOI with DMT. -erowid.org