As per a research, which has been published in the Mayo Clinic Proceedings, has found that methylnaltrexone (MNTX), a peripheral opioid is quite effective in treating bowel function in critically ill patients. The drug has been created by Dr. Jonathan Moss at the University of Chicago. It seems that the drug has proved its efficacy against the allegations, which have been levied on the opioid drug. It has been found that opioid causes constipation in patients and further leads to harmful effects.
French Tribune by Nimisha Sachdev, 3/5/12