After taking lactulose non-stop farting is considered to be caused by adverse drug reactions, but also may be caused by intestinal flora disorders, functional constipation and other diseases, the former caused by no special treatment, the latter caused by targeted treatment under the guidance of the doctor, such as general treatment, drug treatment, and so on. 1. Adverse drug reactions: after taking lactulose may appear flatulence symptoms, resulting in non-stop farting in order to expel gas in the intestinal tract, this kind of situation generally does not require special treatment, after defecation or stopping the drug can be recovered on their own. 2. Intestinal flora imbalance: the increase of gas-producing bacteria in the intestinal tract will lead to non-stop farting. Probiotics can be used as prescribed by the doctor, such as Bacillus licheniformis, Bifidobacterium bifidum, etc., and a regular diet should be maintained in daily life. 3. Functional constipation: patients who need to take lactulose usually suffer from constipation, when constipation, feces in the intestines continue to ferment can produce gas, resulting in non-stop farting; can be relieved by eating corn, spinach and other high-fiber foods, drink more water, appropriate exercise and other ways. If you have farting after taking Lactulose, it is recommended that you go to the hospital after ruling out any adverse drug reactions.