I have chronic constipation from taking pain medication and use Fleet enemas. I am not a surgical candidate for a multilevel disc degeneration. I can not even get out of bed without taking a strong pain reliever. Currently for two years I take methadone 10 mg 4 times a day. I also take softeners, clearlax, 2 times a day. I still can not void on my own daily without the fleet enema. Generic brands also do not work. I have no kidney,liver, or heart problems. It says not to use fleet over 56 and I am now 50 years old. Why do they say not to use it after age 56?