Warning You have reached the maximum number of saved studies Caregiver will be asked to use placebo ointment by applying 5mm on fingertip to the anal verge area twice a day for the duration of the study. Listing a study does not mean it has been evaluated by the U. Comparison of polyethylene glycol and lactulose for treatment of chronic constipation in children. Active Comparator: Polyethylene glycol with Diltiazem Parents will be instructed to apply 5 mm of ointment on a fingertip at the anal verge twice daily for the duration of the study. Department of Health and Human Services.