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Use of rotenone in organic production
In organic production, the use of rotenone is permitted as an insecticide under European Union Regulation 2092/91, amended by 1488/97, Annex II (B)(16). In response to a recent study linking rotenone to Parkinson’s Disease(17), the UK Soil Association put a temporary ban on its use, pending further investigations.

Acute toxicity
Rotenone is classified by the World Health Organisation as a moderately hazardous, Class II(18). The LD50 for rats (the amount of the chemical lethal to one-half of experimental animals) is between 132 and 1,500 mg per kilogram(19). One factor in this wide variation may be the differences in the plant extracts used(20).
The acute oral toxicity of rotenone is moderate for mammals, but there is a wide variation between species(21). It is less toxic for the mouse and hamster than for the rat; the pig seems to be especially sensitive. Recent studies have shown that in rats, rotenone is more toxic for females than males. It is highly irritating to the skin in rabbits(22), and to the eyes. In rats and dogs exposed to rotenone in dust form, the inhalation fatal dose was uniformly smaller than the oral fatal dose(23).
Rotenone is believed to be moderately toxic to humans with an oral lethal dose estimated from 300 to 500 mg/kg(24). A lowest lethal dose of 143 mg/kg has been cited in a child(25). Clinical experience seems to indicate that children, in particular, are rather sensitive to the acute effects of rotenone(26).
Human fatalities are rare, perhaps because rotenone is usually sold in low concentrations (one to five per cent formulation), and because its irritating action causes prompt vomiting. If the dust particle size is very small, and can enter deep regions of the lungs, rotenone’s toxicity when inhaled may be increased. Acute local effects include conjunctivitis, dermatitis, sore throat, congestion, and vomiting. Inhalation of high doses can cause increased respiration followed by depression and convulsions(27). On the basis of rabbit studies, absorption through the intact skin is low(28).

Source: Factsheet - Rotenone