Components of the BOF formula.

BOF is composed of the 18 crude drugs. It has been shown that the main effective components of BOF were shizonepetae spica, glycyrrhizae radix, forsythiae fructus and ephedra herba.BOF由18种生药组成。已有研究证实，BOF的主要有效成分为荆芥穗（shizonepetae spica）、甘草（glycyrrhizae radix）、连翘（forsythiae fructus）与麻黄（ephedra herba）。