B Lact Lactulose 3.35g/5ml Syrup is a laxative used to treat constipation. Each 5ml dose contains 3.35g of lactulose, which works by drawing water into the bowel, softening stools, and stimulating bowel movements. The 120ml bottle provides a convenient and effective solution for relief from constipation, often used for both short-term and long-term management.