Hello Thanks for your query. I will try my best to provide you with best possible professional recommendations to your questions. Lactulose is a synthetic, non-digestible sugar used in the treatment of chronic constipation[1] and hepatic encephalopathy, a complication of liver disease. Lactulose is not given to treat hallucination. The effectiveness of lactulose in treating hepatic encephalopathy is somewhat controversial. However, lactulose can effectively be used as secondary prohylaxis of hepatic encephalopathy in patients with cirrhosis. Moreover, recent studies showed improved cognitive functions of cirrhotic patients with minimal hepatic encephalopathy treated with lactulose. As you have not given your history properly , like why you have prescribed this drug it is difficult to interpret. Yet again, I do hope that you have found something helpful and I will be glad to answer any further query. Regards