MCPA carries a DANGER signal word on the label even though its acute toxicity is only slightly toxic. This is due to its potential to cause severe eye irritation. Symptoms in humans from acute toxic exposure include slurred speech, twitching, jerking and spasms, drooling, low blood pressure, and unconsciousness.
The LD50 for MCPA in rats ranges from 700 mg/kg to 1,330 mg/kg and from 550 to 800 mg/kg in mice. The estimated human lethal oral dose is from 250 to 450 mg/kg . . .
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