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Food and Drug Administration (FDA)

Because the toxicity of the cyanide antidote currently available in the United States renders it ill-suited for use in terrorist incidents and other situations requiring rapid out-of-hospital treatment, hydroxocobalamin--an effective and safe cyanide antidote being used in other countries--has been introduced in the United States

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For example, hydroxocobalamin is safer than the methemoglobin inducers in patients with smoke inhalation

Its about adding a precise amount of a specific type of water in a particular way to achieve a known concentration