(a) Al-Sha'bi (may Allah have mercy on him) says that the Messenger of Allah (peace and blessings be upon him) said: "The best medicine is giving medicine through the nose, giving it into one side of the mouth, cupping, taking a laxative, and applying leeches."
(b) Ikrimah (may Allah have mercy on him) narrates from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both): "The best medicine with which you treat yourselves is drawing it up through the nose, taking it from one side of the mouth, cupping, and taking a laxative."
(c) Ibn Abbas (may Allah be pleased with them both) narrates from the Prophet (peace and blessings be upon him): "Ithmid kohl sharpens the eyesight and makes the hair grow."
The narration of al-Sha'bi is mursal.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19579