Don't think Permethrin is any better, either. Permethrin is topical insecticide, which is not known to rapidly harm most mammals or birds, but is dangerously toxic to cats and fish. It has a low mammalian toxicity and is poorly absorbed by skin, which has prompted its use to treat head lice and nits, scabies, and various species of ticks. But the strikes against it are significant. Peremthrin is a suspected carcinogen, endocrine toxicant, liver toxicant, neurotoxicant and reproductive toxicant.
How Should You Be Using These Chemicals?**