"my experience with opana was great.  it really gave me back at least 95%. after 3 failed back surgeries on my disc low back along with both knees which my knee surgeries were helpful. i also broke my back at same time along with my neck injury which i was diagnosed with a extreme strain of my neck. which my doctor gave me a 50% chance of success so i decided not to have and live with the pain. although when purdue pharmaceuticals decided to completely change the formula when making the 40mg opana my life changed for the worst. i haven&#039;t been the same since. believe me because i have tried every medicine on the market since 1993. "