CAS RN: 56-38-2

Range of Toxicity

A) TOXICITY: A specific toxic dose has not been established. The World Health Organization (WHO) has classified parathion as pesticide class Ia (extremely 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. Oral doses in the range of 120 to 900 milligrams have been fatal; however, humans have survived much higher reported doses. Three individuals survived estimated doses of 20,000 to 40,000 mg of parathion.
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