With Paranix Head Lice & Eggs Spray, one 15 minutes treatment is all that is required to kill 100% of head lice and eggs. Paranix Spray is odorless and sprays on easily, with no mess or fuss. Also available in lotion form. All Paranix treatments provide a double physical action attacking both head lice and their eggs. Paranix Spray (or Lotion) and Paranix Shampoo make head lice and their eggs suffocate and dehydrate, whereas Paranix Sensitive attaches onto the respiratory orifices of head lice and eggs making them suffocate and penetrates into the heart of the eggs stopping their development.