The popular prescription shampoo, Lindane, which is used to treat lice, was slapped by the Food and Drug Administration (FDA) for failing to warn consumers about its potential toxicity.

In a little-noticed December letter, the FDA cites concern over some of the information drugmaker Morton Grove Pharmaceuticals provided on websites and in mailed materials, including a statement by the company that treating head lice effectively requires two applications, several days apart. That is "extremely alarming given that retreatment with Lindane Shampoo can lead to increased exposure and possibly death," the FDA says.

California has already banned Lindane, and three other states, including New York and Michigan, are considering similar bans. (The manufacturer, meanwhile, insists that they didn't do anything wrong.)
Lindane was supposed to be a powerful last resort. Many of the other treatments on the market have been losing their effectiveness, and the lice epidemic seems to be raging unabated.
I know people whose kids have been infected two, three, even four times.
Why lice seems to becoming more common is a question I will address shortly. Stumble It!