I have also heard that it can be some what hard on the kidneys, so my vet (who informed me of this) suggested that the shots be administered in the upper third of the body. This is supposed to make it easier on the kidneys, which are in the lower third of the body.
I'm not sure how accurate this info is, but a vet that is experienced with boas informed me of this. Hopefully you or I won't ever have to deal with this problem again!
Best of luck,
Eric

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