Abstract

Solutions A and B (15.8% ferrous sulfate in 0.3% citric acid and 6% sodium carbonate, respectively) have been available as a first-aid treatment for cyanide ingestion for many decades. Controversy surrounding the efficacy of solutions A and B has existed for much of that time, the main protagonists being in the UK. The current opinion in the UK is that solutions A and B should no longer be used as a first-aid measure in the management of cyanide poisoning. Similarly, oral sodium thiosulfate or activated charcoal should not be used. The recommended first-aid treatment of symptomatic cyanide poisoning is 100% oxygen and amyl nitrite, irrespective of the route of exposure.

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