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I am sorry to hear this.
Was this a doctor who had treated you previously?
If the hospital was aware that you were allergic to that drug, then yes you would have a claim.
Whether the hospital will have to keep treating you after filing a claim depends mostly on how many other hospitals are available in your area.
You can get a free consultation from some of the medical malpractice attorneys listed by location here.
Please follow op on this with a local attorney.