I had a series of 3 Bier Blocks-may go back for more but currently working with a new treatment of cold laser therapy.
But ya asked so I'll say it depends on the experience of the doctor & the combinations of meds used. My doctor great and always evaluating my response and 'tweaking' the next procedure to maximize results.
First one good but did not last, 2nd one not as good and did not last, 3rd one fantastic and lasted quite a while and we are prepared w/slight change for next round should we go on.
Don't give up but be sure your doctor involves you in the results. You need to identify EVERYTHING to help the doctor know what is and isn't working.
Good luck!