Head lice are common in Irish schools and spread by direct head-to-head contact, not by poor hygiene. Our head lice treatment range includes physical-action sprays, lotions and shampoos that smother or dry out lice and their eggs, fine-tooth nit combs for detection and wet combing, and leave-in conditioning sprays for use during outbreaks. What is the strongest head lice treatment? There is no single strongest head lice treatment. Treatments work in different ways, and HSE guidance lists physical treatments as the first choice. If one has not worked even though it was used properly, HSE guidance says to use a different type for the next course. Derbac M Liquid (malathion 0.5% w/w) is a pharmacy-only insecticide medicine licensed for the treatment of severe head lice infestation in adults and children aged 6 months and over. It works in a different way to physical treatments, so it may be an option if they have not worked. It goes on dry hair, stays on for 12 hours or until the next day, and is repeated after 7 days. We ask a few short questions when you order, and our pharmacist reviews every order. Only treat when you find a live louse, check everyone in the house, and ask our pharmacists if you are unsure which product suits your child’s age or hair type. Always read the label.Read our step by step guide on how to get rid of head lice, with a 2 week plan you can add to your phone.