Epidurals work pretty well. The first injection can reduce your pain as much as 90%, but it's very temporary, especially for long-time sufferers. If they hit the target, you can expect relief for about 3 months.
An alternative is radiofrequency ablation (RFA). The procedure is very similar; a triggered injection; but the chemicals are different. RFA chemicals burn the nerve that's causing the problem, which, in simple terms, disables it so it can't send pain signals until it heals. That can take 6 months to a year. Meanwhile, your pain is reduced by 90% to 70%. Your pain gradually comes back as the nerve heals, but it worked way better for me than the epidural.
Epidural injections work best on people who have a temporary issue, like a herniated disc or an injury that's going to heal.
The RFA is for people who are long-time chronic sufferers with an issue that doctors don't yet know how to resolve. (in my case, a birth-defect)