Aculax Syrup 150ml contains lactulose for the effective relief of constipation and bloating. Lactulose belongs to a class of drugs called laxatives. A class of drugs is a group of medications that work in a similar way. These drugs are often used to treat similar conditions. Lactulose is a synthetic (man-made) sugar. It breaks down in your large intestine and then draws water into the intestine. This softens your stool, which helps ease constipation.