E Scab Lotion 60ml (Permethrin 5%)E Scab Lotion 60ml Permethrin 5% Prescription Scabies & Crab Lice Treatment Rx E Scab Lotion by Health Serving contains Permethrin 5% w v a prescription topical antiparasitic lotion for the treatment of scabies (Sarcoptes scabiei mite infestation) and crab lice (Phthirus pubis). Permethrin is a synthetic pyrethroid that disrupts sodium ion channels in parasite nerve cells, causing paralysis and death on contact. Composition Permethrin B. P.: 5% w v