Assertion: mustard gas's effect | /r/HasProperty | opioid-induced apnea
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text: Assuming that these were the only active constituents (which has not been verified by the Russian military), the primary acute toxic effect to the theatre victims would have been opioid-induced apnea; in this case mechanical ventilation and/or treatment with naltrexone, the specific antidote for poisoning with carfentanil in humans, would have been life-saving for many or all victims.