Mercury provides very bad results in the 9th house also,because this house belongs to Jupiter and Mercury remains inimical to it. It causes continuous mental restlessness and defamation of various types. If Moon, Ketu and Jupiter are placed in 1, 3, 6, 7, 9 and 11th houses, Mercury does not give very advantageous results.
Lal Kitab Remedies for Mercury(Budh):
Avoid the use of green colour.
Get yours nose pricked.
Offer mushroom filled in an earthen pot to a religious place.