Methrix Lotion – Permethrin 50mg for Scabies and Lice TreatmentMethrix Lotion Effective Permethrin Treatment for Scabies and Lice Methrix Lotion, containing 50mg of Permethrin, is a highly effective topical treatment used for the management of scabies and lice. Scabies is a skin condition caused by tiny mites that burrow into the skin, while lice are parasitic insects that infest the scalp, hair, and body. Permethrin works by attacking the nerve cells of these parasites, causing them to become paralyzed and die.