Ipecac
Ipecac was a purple-tinted drug in liquid form which, when ingested, caused severe gastric distress in Humans. Ipecac was easy to conceal, and appeared to dissolve very quickly in room temperature liquids.

Ipecac was used by Doctor Julian Bashir to poison a drink in the Bashir 62 holoprogram as part of an elaborate ruse staged by station personnel to defeat a jack-in-the-box subroutine planted by its creator, . ()

External link

de:Ipecac
Drugs