I wouldn't say that would be suitable...not because it will cause any damage, but because you need to be in quite a bit of pain from what I understand for the injections to work, as my understanding was they cause a stinging which is painful enough to detract from contraction pain. I think I have read a similar question before and people generally said that it's best to leave it until labour has really ramped up for it to be it's most effective. I think for a backache it would just hurt you more than help!
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