How do members experience Methylnaltrexone? Top 5 reported purposes & perceived effectiveness Purpose Patients Evaluations Perceived Effectiveness This item is relevant to you: Constipation 9 0 0% 0% 0% 0% 0% This item is relevant to you: Narcotic bowel syndrome 4 0 0% 0% 0% 0% 0% This item is relevant to you: Chronic constipation 2 0 0% 0% 0% 0% 0%