Fast-Acting Permethrin Shampoo for Lice Treatment. KEY FEATURES & BENEFITS: ‣ Contains 1% Permethrin, a potent ingredient for killing head lice. ‣ Convenient shampoo form for easy application and rinsing. ‣ Effective against lice and their eggs. ‣ Helps soothe scalp irritation caused by lice infestation.