Sugar felt better right away, and I never saw a bad reaction, but sometimes it does seem make her tired for a day or two.
As an aside, she also has heart problems and the vet has hit a few heart points each time (as well as "pee points" for her incontinence ) When she went to her cardiologist in March, her enlarged heart had actually shrunk a bit. Enough that he reduced the dosage on her meds
I don't know what else it could have been, if not the acupuncture . I know acupuncture doesn't work for everyone, but it sure has helped Sugar!