-- Helps to relieve constipation -- When soft stool is considered of medical benefit (haemorroids, post colonic/anal surgery) Duphalac oral solution contains 667 g lactulose per 1000 ml. Duphalac oral solution does not contain any excipients, but may contain small amounts of related sugars (e.g. lactose, galactose, epilactose, fructose) derived from the route of synthesis. Dose:- 10-15ml to be taken at night time or up to three times a day when needed.