Ivermectin
"I used Sklice yesterday on my 6 year old whohas long, thick, curly hair.  I only found a few live adults on her, but so many nits. The contents of the tube was barely enough to cover all of her hair.  Today, I could not find any live lice, but nits remained even after using a nit comb.  I called the customer service line.  The representative could not answer if the product kills the nits, and even insisted that a nit is an empty egg casing...seriously?  Um no, it's an unhatched louse.  They need to provide more accurate scripting for people who answer their phones. That's basic information, not rocket science. I guess we will find out."