How long does epidural injection work for back pain?

Duration can be ...: Duration of pain relief varies, lasting from several weeks to sometimes years. Epidural injections are usually done in conjunction with a physical therapy program and/or home exercise to strengthen the back muscles and prevent future pain episodes.

Epidural injection: Great question - answer its variable - there is no definite time frame. The key is to determine how much relief, how much functional improvement.

ESI: An epidural steroid injection is a minimally invasive procedure that delivers steroids via a needle directly into the epidural space to help reduce inflammation. The steroid is absorbed and metabolized within few weeks. However, the pain relief might extend beyond this time frame. Prolonged pain relief is presumed to result from a reduction in an inflammatory process.