Fenoxycarb is a carbamate insect growth regulator. It has a low toxicity for bees, birds, and humans, but is toxic to fish. The oral LD50 for rats is greater than 16,800 milligrams per kilogram (0.269 oz/lb). Fenoxycarb is non-neurotoxic and does not have the same mode of action as other carbamate insecticides. Instead, it prevents immature insects from reaching maturity by mimicking juvenile hormone.