After reading this article you will learn about the various drugs acting on gastrointestinal tract. Sialagogues: Sialagogues or sialics are the salivary stimulants which increase the volume and fluidity of saliva. Uses: (i) Iatrogenic (drug-induced) hypoptyalism. (ii) Xerostomia (dryness of the mouth due to lack of normal secretion) resulting from other causes such as radiotherapy […]