Laboratory studies of ingredients in seven popular flea and tick control products reveal adverse health effects in all animals tested. The effects of these well known and aggressively marketed products range from convulsions, body tremors and labored breathing to thyroid cancer, brain lesions, and liver and lung tumors. Yet TV commercials with trusty looking veterinarians pitch only the happy side of these products.

Which flea and tick pesticide are you using on your dog and/or cat? If your favorite treatment contains the active ingredient Fipronil, Imidacloprid, Methoprene, Permethrin, Pyriproxyfen or the inert ingredient Butyldydroxytoluene, Butylhydroxanisole, Carbitol, Ethanol, or Polyvinlpyrrplidone, you need to know about the not-so-happy side of these products as well.

If you think your veterinarian or local pet store would never sell you such a sinister poison, think again.

Advantage (Bayer Corporation), Adams Spot-On Flea & Tick Control (Farnam Pet Products), BioSpot Flea & Tick Control (Farnam Pet Products), Defend EXspot Treatment (Schering-Plough Animal Health), Frontline Top Spot (Merial Limited), Frontline Plus (Merial Limited), and Zodiac FleaTrol Spot On (Wellmark International) – all contain one or more of the aforementioned active or inert ingredients.

Toxicology and morbidity findings from these pesticide products were gathered over a decade of laboratory testing by the United States Environmental Protection Agency; Occupational Safety & Health Administration, U.S. Department of Labor; Extension Toxicology Network; Journal of Pesticide Reform; Pesticide Action Network North America and other sources, with additional information supplied by Material Safety Data Sheets.

Most testing was performed for the benefit of new product manufacturers in order to qualify for EPA registration. Scientists overdose laboratory animals to determine how much of the product will kill 50% of the test population. Information is then extrapolated and assumptions made that may apply to domestic animals and human beings.

According to laboratory tests, Fipronil (Frontline Top Spot and Frontline Plus) is a neurotoxin and suspected human cancer agent. Fipronil can cause liver toxicity, thyroid cancer, kidney damage, raised cholesterol, lack of coordination, labored breathing, miscarriages and stunted offspring.

Laboratory testing of Imidacloprid (Advantage) on mice, dogs and rats shows this insecticide to be neurotoxic to laboratory animals, also causing a breakdown of coordination, labored breathing, lesions of the thyroid, reduced birth weight, and increased birth defects.

The synthetic broad spectrum pyrethroid insecticide Permethrin (Adams Spot-on Flea & Tick Control; BioSpot Flea & Tick Control; and Defend EXspot Treatment) shows indications of being an endocrine disrupter and the cause of lung cancer and liver tumors in laboratory animals.

Methoprene and Pyriproxyfen (Zodiac FleaTrol Spot On; and BioSpot Flea & Tick Control) are known as insect growth regulators (IGR), both of which restrict the growth of fleas to the juvenile stage where reproduction is not possible. Laboratory testing reveals that Methoprene causes enlarged livers and degeneration of the kidneys.

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