In advanced cases Xinlay staves off miserable bone pain by an additional three months but has minimal side effects, according to two studies of almost 1, 100 patients.

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To get to your question, the antidepressant potential of ketamine was discovered serendipitously in patients receiving the drug for the treatment of complex regional pain syndrome, or CRPS, a miserable condition characterized by severe pain, swelling and changes in the skin.

CNN: Is it safe to use ketamine as a pain drug?