Malathion

CAS RN: 121-75-5

Range of Toxicity

A) A specific toxic dose has not been established. The World Health Organization (WHO) has classified malathion as pesticide class III (slightly hazardous). Organophosphates are absorbed across the lung, mucous membranes (including gut), and skin. Poisoning depends upon inherent toxicity, dosage, rate of absorption, rate of metabolic breakdown, and prior exposure to other cholinesterase inhibitors. The acute oral lethal dose is estimated to be below 1 g/kg; almost all reported fatalities from malathion have involved ingestion. Adults have survived ingestions up to 50 grams with intensive treatment.
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