it will take at least 24 hours maybe 48 for the steroid to kick in. It's excruciating pain until it does. I had one in my lower back before and one in my wrist, they didn't tell me the pain the evening of would be so bad. I had to look it up online. The one for my tendonitis in my wrist helped 85% after the first week, the back one didn't help at all. I just had a radiofrequency rhizotomy today by a pain management doc. I have a lot of pain, too, but he said don't expect improvement for a week. They burn the nerve endings with a laser or radiofrequency waves, and a lesion grows over the burnt nerve.
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