Also avoid the following herbs for at least 48 hours before and after:

St. Johns Wort (if it has been taken regularly, needs two weeks to clear the system)
Betel
Boswellia
Carrot seed
Chamomile
Cowhage
Curcumin
Dill seed
Ephedra
Fennel seed
Fo-Ti
Ginseng
Horny Goat Weed
Kanna
Kava
Kratom
Licorice Root
Nutmeg
Parsley seed
Rhodiola Rosea
Scotch Broom
Siberian Ginseng
Sinicuichi
Turmeric
Yerba Mate
Yohimbe

These are medicinal plants and can cause psychic interference with the medicine.