The Messenger of Allah ﷺ prescribed for sciatica that the fat tail of an Arabian ram, neither small nor large, be taken and melted down, then divided into three portions, with one portion to be drunk each day on an empty stomach.
حدثنا عبد الرحمن بن مهدي حدثنا حماد بن سلمة عن أنس بن سيرين عن معبد بن سيرين
أن رسول الله ﷺ نعت من عرق النسا أن تؤخذ ألية كبش عربي ليست بصغيرة ولا عظيمة فتذاب ثم تجزأ ثلاثة أجزاء فيشرب كل يوم على ريق النفس جزءا
Its chain of transmission is daif, because the narrator transmitting from the companion is unknown. Muhammad bin Sirin and Mabad bin Sirin were two brothers, both distinguished and well known.Ibn Majah related the hadith with a sahih chain of transmission, 2/1147, no. 3463. Hakim graded it sahih, 4/206, and Dhahabi agreed with him.