Compositions comprising flavonoids and Citrus specific cationic surfactants for treating infestations of head lice

A composition for use in a method for treating lice infestations head, comprising an extract containing flavonoids plants of the genus Citrus and / or one or more flavonoid Citrus isolated, in combination with at least one selected cationic surfactant of group consisting of quaternary ammonium salts having one or two chain (s) alkyl (s) linear saturated C8-26 (s), wherein residues remaining alkyl groups are C1-6 alkyl, and quaternary ammonium salts having a saturated or unsaturated attached to the nitrogen of ammonia through an amide bond C8-26 linear fatty acid.