A laxative, either in the form of a medicine or a food such as asparagus or hops, which has the effect of moving the bowels, or aiding digestion and preventing constipation.
adj
Having a gentle laxative effect.
emesis
noun
The act or process of vomiting.
How often have the words aperient and emesis occurred in a corpus of books? (source: Google Ngram Viewer )