Ipecac
Drugging a martini
Ipecac was a purple-tinted drug in liquid form which, when ingested, caused severe gastric distress in Humans.
Ipecac was used by Doctor Julian Bashir to drug 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, Felix. (DS9: "Badda-Bing, Badda-Bang")
While no longer produced, ipecac (often called "syrup of ipecac") was a real medicine available during the period. It was used as a purgative, to induce vomiting.
Ipecac was originally suggested by assistant Stunt Coordinator Leslie Hoffman during the production meeting but turned down by the producers in this meeting because they did not like the yellow color. The drug seen in the episode has a different color but they kept the name. (Information provided by Leslie Hoffman)