Animal studies have been reviewed elsewhere.l,a The 50% lethal dose (LD50) after zinc phosphide ingestion by rats is close to 40 mg/kg.2 The figure for man is not known. Table 1 lists cases in which the ingested dose is known approximately. Ingesting 4 to 5 gm has caused death on two occasions,5,11 but patients have survived 25 gm9 and 50 gm.s Dosages in the region of 100 mg daily appear to be harmless,13 but as little as 30 mg is nauseous.14 Chronic poisoning in man has not been described.
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J Stephenson (1967) studied this question.
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