1) Cathartic 2) Laxative 3) Purgative 4) Strongly laxative 1) Laxative 2) Purgative 
• (n.) A purgative or cathartic. • (a.) Emptying; evacuative; purgative; cathartic.
(e-vak´u-әnt) emptying. cathartic (defs. 1 and 2). a remedy that empties any organ, such as a cathartic, emetic, or diuretic.
E·vac'u·ant adjective [ Latin evacuans , -antis , present participle of evacuare : confer French évacuant .] Emptying; evacuative; purgative; cathartic. -- noun (Medicine) A purgative or cathartic. 
Type: Term Pronunciation: ē-vak′yū-ant Definitions: 1. Promoting an excretion, especially of the bowels. 2. An agent that increases excretion, especially a cathartic.
evacuant 1. Emptying; evacuative; purgative; cathartic. 2. Medicine which tends to empty an organ or passage. 3. Evacuating; promoting thorough evacuation; an evacuant medicine or agent; especially, from the bowels; cathartic; purgative.