The answer to your itchy scalp may be at the nearest drugstore. Dandruff shampoos, which can also treat some cases of seborrheic dermatitis and scalp psoriasis, have different active ingredients. You may have to try a few to find the one that works -- or even alternate between them. Some of your choices include:
- zinc pyrithione (Selsun Salon and Head & Shoulders)
- coal tar (Neutrogena T/Gel)
- salicylic acid (Ionil T)
- selenium sulfide (Selsun Blue)
- ketoconazole (Nizoral) [source: Mayo Clinic]
You can usually get rid of lice with over-the-counter insecticide shampoos (pediculicides) such as Rid or Nix.