A ceremonial entheogenic brew, which has been used for centuries (at least!) by South American shamans. Traditionally it is made with the plants Psychotria viridis (which contains DMT) and Banisteriopsis Caapi (sp?)&(contains harmala alkaloids, which make the DMT orally active). Ayahuasca made with other plants is usually known as "anahuasca"- with pure chemicals it is called "pharmahuasca". Users typically see God and barf their guts out.