No definition of the term laxative is satisfactory since their mode of acti
ons affects multiple mechanisms, absorption/secretion and motor activity: L
axatives are very heterogeneous chemically. They act by either holding wate
r inside the bowel lumen (dietary fibre, osmotic laxatives), by inhibition
of water absorption or stimulation of secretion (stimulation laxatives), ol
by stimulation of colonic motility (stimulant laxatives, 5HT(4) agonists).
Most laxatives have side-effects but these ape usually mild.