"A UCSF study suggests patients with chronic pain may experience greater relief if their doctors add cannabinoids – the main ingredient in cannabis or medical marijuana – to an opiates-only treatment. The findings, from a small-scale study, also suggest that a combined therapy could result in reduced opiate dosages." - UCSF Study Finds Medical Marijuana Could Help Patients Reduce Pain with Opiates
Unfortunately all opiates inhibit the peristaltic movement of feces through the bowel. The result may be a bowel impaction. It is not uncommon for patients to develop an obstruction that requires a bowel resection and a temporary colostomy. This can be very dangerous in the elderly. Naltrexone will restore movement, but will cause immediate painful withdrawal symptoms. Fibre may make this worse. Drinking more fluids helps, but the answer is to have a hiatus nor lower the dose of opiates.