What is the best thing for a sciatic nerve?

Standard treatments for sciatica of recent onset include:
•    A short course of acetaminophen or a non-steroidal anti-inflammatory drug (NSAID), such as ibuprofen or naproxen
•    Rest, balanced with gentle stretching – maintaining physical activity (as symptoms allow) is important though activities that worsen symptoms should be avoided
•    physical therapy
Some physicians prescribe a brief course of steroid medication for recently diagnosed sciatica. 
Other treatments, such as steroid injections or surgery, depend on the severity of symptoms, the progress made with the conservative treatments above, and whether the results of imaging (such as MRI) demonstrate a specific cause.
When sciatica is longstanding, other treatments that may be beneficial include a stress reduction program, massage, acupuncture, duloxetine, tramadol or a muscle relaxant.