In regard to the prophetic prescriptions mentioned in the mubaarak ahaadeeth, Hazrat Shaikh Moulana Muhammad Zakariyya (rahmatullahi ‘alaih) once mentioned the following:
Through adopting the prophetic prescriptions (mentioned in the hadeeth), one will definitely acquire shifaa. However, it should be borne in mind that it is necessary for one to adhere to the conditions in which these prophetic prescriptions have been prescribed e.g. the place and climate where one resides in being hot or cold, the temperament of the person, the manner in which the medication should be administered, etc. (Through adhering to these conditions, one will certainly acquire shifaa.)
It is reported that a certain narrator of hadeeth had underwent cupping on his head with the intention of practising on the sunnah. However, since he did not adhere to some of these conditions, (the treatment did not prove effective and beneficial, but rather) his memory deteriorated to the extent that despite being a haafiz of the Quraan Majeed, he had lost his memory and was even unable to recite Surah Faatihah.
(Qutbul Aqtaab Hazrat Shaikhul Hadith Moulana Muhammad Zakariyya [rahmatullahi ‘alaih] pg. 514)
Source: Ihyaauddeen.co.za