My father is 65 years old , from last 2 years he has chronic constipation , he has done cbc, pbf, tsh, stool occult blood , fecal calprotectin tests ..each test is normal , there is no inflammation or blood also he don't take any other medications, Currently he is taking pegclear 60ml & prucalopride 1mg twice a day but only 10% improvement . What should we do next ? Is there any test to be done ? Or any changes in medication ? We don't have good gastro doctor here .