Ipecac is an item in Scribblenauts that behaves similarly to Poison and other poison/illness inducing items, except it also causes the victim to vomit uncontrollably for a while, making them Hungry as well. It looks identical to Serum, but behaves completely differently. In Scribblenauts Remix and Super Scribblenauts, it's just another synonym to poison.
Anyone with the cured adjective will not get sick from eating Ipecac.
Oddly, in original Scribblenauts, there is no Ipecac, but there is Ipedcac, which is just Poision.