C.N.
When my daughter had the head lice from hell, none of the treatments in the drugstore worked, AND they dried her hair out something terrible. Finally, I took Adams flea shampoo, put it on her hair while it was dry, worked it in, and let it sit for about 20 minutes, then had her get in the shower, lather it up and rinse it out. Worked beautifully. I combed tons of dead lice out of her hair, and the conditioners in it helped reverse the dryness from the other stuff.
I stripped her bed and washed her sheets and pillow cases, and sprayed her mattress and pillows with Adams flea spray.
Supposedly, the active ingredient in Rid and such is the same as in the Adams, but the Adams worked when Rid didn't, AND was a lot cheaper.