The invention belongs to the technical field of veterinary medicines, and discloses
radix bupleuri and
cassia twig oral liquid and a preparation method thereof. The
radix bupleuri and
cassia twig oralliquid is prepared from the following crude medicines in percentage by weight of 20-40% of
radix bupleuri, 10-30% of radix scutellariae, 10-20% of herba ephedrae, 5-20% of echinacea purpurea, 5-20% of
radix trichosanthis, 5-20% of
cassia twigs, 5-20% of dried ginger, 5-10% of
oyster and 5-10% of radix glycyrrhizae preparata. The preparation method comprises the following steps of taking the crudemedicines in proportion, and preparing the taken crude medicines into coarse
powder; adding water to 3 kinds of crude
medicine coarse
powder of the radix bupleuri, the cassia twigs and the dried ginger, performing
distillation, collecting volatile oil for standby application, and filtering an
aqueous solution obtained through
distillation so as to obtain decoction dregs and
distillation remainingliquid; adding water to the obtained decoction dregs and surplus other crude
medicine coarse
powder, performing ultrasonic decoction, performing
filtration after decoction, taking filtrate, combiningthe taken filtrate with the distillation remaining liquid, performing membrane separation so as to obtain
clear liquid, and further concentrating the
clear liquid so as to obtain concentrated liquidof which the
relative density is 1.15-1.20 at 50 DEG C; and adding
polysorbate 80 of which the constant volume weight is 1-2% to the volatile oil, after dissolving to obtain a solution, adding the solution to the concentrated liquid, then adding a
preservative, making the volume constant with water until the weight of a mixture is 1-2 times of the total weight of the crude medicines, performing uniform stirring, performing
filtration, and performing filling so as to obtain the radix bupleuri and cassia
twig oral liquid. The oral liquid disclosed by the invention is reasonable in prescription and high in
absorption rate.