Hi, with severe constipation he needs to be investigated. And presence of gallstones is unlikely to cause severe constipation. Constipation has been categorized as slow transit constipation, normal transit constipation, and obstructed defecation. It could be a functional disorder, so please consult a GI specialist. In the meantime give him plenty of oral fluids and include plenty of yogurt with his diet. Also, try OTC laxatives like Agarolsusp and see if it helps. Regards.
Thank you very much. He is better and we are consulting GI doc.