Full Marks Solution is for the treatment of head lice. It contains isopropyl myristate and cyclomethicone and works by a physical action rather than by an insecticide: it coats and dissolves the waxy outer layer of the lice, causing them to dehydrate and die. Because the action is physical, lice do not develop resistance to it. It is fragrance-free and is generally considered suitable for people with asthma or eczema, but it should not be used on children under 2 years of age except on medical advice. Keep away from the eyes and flames, as the solution is flammable. If you are pregnant or breastfeeding, or treating a young child, speak to your pharmacist before use. If irritation occurs or the infestation does not clear, speak to your pharmacist or doctor. Always read the instructions for use before use.