Toxicities expressed as LD50 values of 2-dialkylaminoalkyl-(dialkylamid) o-fluorophophates for rats and mice (i. m. administration) were determined. Rats were more sensitive to these compounds than mice: LD50 values varied from 17 to 261 micrograms/kg for rats and from 30.5 to 1222 micrograms/kg for mice, respectively. Different routes of administration in one derivative of this group substituted by methyl groups only were compared. The highest toxicity (lowest LD50 value) in intravenous administration (11 micrograms/kg) and the lowest one in percutaneous (1366 micrograms/kg) were found.
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