Eva Q Syrup belongs to the group of medicines called laxatives used to treat constipation. Additionally, Eva Q Syrup is also used to prevent hepatic encephalopathy (decreased brain function due to liver disease). Constipation refers to infrequent bowel movements in which the stools are often dry, painful, and hard to pass. Hepatic encephalopathy is a liver disease in which the liver does not remove the toxins from the body, which leads to loss of brain function.