Absorption
Methiocarb can be taken up through different routes. The most common for humans is up take through the skin or as an aerosol, because of its use as a pesticide in agriculture. For insects and birds this would be by the oral route. The NOAEL’s of these routes have been determined as follows: For the oral route the NOAEL is set to 3.3 mg/kg per day for rats, based on a 2 year study. For absorption through the skin the NOAEL is set to 150 mg/kg per day for rabbits, based on the reduction of food consumption.
When methiocarb is fed to rats at a dose of 50 ppm, it gives a reduction of brain cholinesterase by 14% and 5% in males and females respectively. When methiocarb is administered as an aerosol to rats, the highest concentration (96 mg/m3 in solvent) showed signs of involuntary muscle contraction (tremors). These signs weren’t observed in the other groups. The brain acetylcholine esterase is reduced in comparison to the solvent controls, to 61% and 74% for males and females respectively. There were no changes in organ weight. The NOAEL was determined to be 6 mg/m3 based on the reduction of brain acetylcholine esterase activity.
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