Answer
(Fatwa: 693/638=D-1429)
There is a dua in Behishti Zewar chapter 9 named Hirz Abu Dujana (رضی اللہ عنہ). You should write it and put it around the neck of the patient. The dua has been instructed by the Prophet (صلي الله عليه وسلم). Also, you should recite Surah Al-Falaq and Surah Al-Naas and blow it over the body. Besides, there is a booklet of Shiakhul Hadtih Maulana Muhammad Zakaria named Manzil which contains the verses of the Holy Quran and authentic duas which are very useful to remove ghoul, magic, Satanic effects and tested by the pious men.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband