How do you get rid of head lice on a human female when over the counters do not work?

See your doctor: Lice can be resistant to some treatments. Also, be seen by your doctor to ensure this is the true problem. If you have lice, there are prescription treatment options.

Lice termination: Tx of lice requires accurate identification of nits & lice. A pediculicide is usually used- otc like nix (permethrin) or rid or prescription meds like lindane or malathion. Work carefully through hair & remove individual nits. Purchase a special lice nit comb to aid you. Check for nits & remove as seen over the next 7 to 10 days. If there are nits after 7 to 10 days – a 2nd pediculicide tx may be needed.