Greetings! thanks for the query. Itching can persists up to 4-6 weeks even after successful treatment of scabies. You can use Crotamiton cream/ lotion (e.g Crotarax) to relieve the symptoms. You must use this atleast 2-3 times per day for full benefit. You can also take antihistamine tablet like "Chlorpheniramine" at night which will improve itching as well as help you with sleep (as it is sedative antihistamine).