"my doctor just switched me from 30mg of ms contin to hysingla 20mg once a day. mind you i have been taking the same thing for over 4 years. this hysingla is a joke!!! after 3 hours i was in so much pain i thought i was dying!! felt like i was going to be sick, and not from the medicine, it was because i was in so much pain. whoever said this lasts for 24 hours is completely ridiculous. worst ever!!"