Before you use a conventional lice-treatment shampoo for yourself or your children, consider this: Many lice-treatment shampoos contain ingredients that have been banned as agricultural insecticides and are extremely toxic. For instance, the insecticide lindane, once used to protect crops such as barley, wheat, and corn from pests, is no longer used by farms in Canada, and has been banned in over 50 countries around the world. But it can probably still be found at your local drug store, in bottles of lice shampoo.
In 2002, the state of California in the United States banned lindane from being used in pharmaceutical products due to reports that the chemical was causing skin irritations, dizziness, headaches, convulsions, and even death. Read more about How to Treat and Prevent Head Lice