I'm reporting back that I have not had any relief after my 3rd IV lidocaine infusion at 600 strength. I have my 4th Monday before meeting with my Neurologist to discuss. Perhaps he will increase my dose and keep trying, but I have to say, I will need well balanced, sufficient relief as my pain is head to toe. The infusion itself is a piece of cake other than the boredom of sitting for 4-5 hours. My negative experience has been slight temperature, flush face (1st infusion only) and always a headache but, I'm a headache person.