The invention discloses a Wanchu
capsule preparation method capable of reducing harmful impurities and improving overall stability, and belongs to the technical field of
traditional Chinese medicine preparations, the Wanchu
capsule preparation method comprises the following steps: S1, mixing rhizoma picrorhizae,
rhizoma coptidis,
catechu and fragrant ink according to a formula ratio, crushing into
fine powder to form a mixture I, adding powdered
sugar into the mixture I, and uniformly stirring and mixing to form a mixture II; mixing and
grinding borneol and artificial musk to form a mixture III; s2, boiling the ox bile for 10-30 minutes, and filtering to obtain filtrate; s3, adding an adjusting stabilizer into the filtrate, wherein the adding amount of the adjusting stabilizer is that the pH value of the filtrate is adjusted to 7.2-7.8; s4, adding the formula amount of bear
gall powder and
calculus bovis into the filtrate adjusted in S3 to form a mixture IV; s5, adding the mixture II into the mixture IV to form a mixture V, then adding an
ethanol water solution, and performing
granulation,
drying, granule finishing and screening through a granulator to obtain intermediate granules; and S6, uniformly mixing the mixture III with the intermediate particles, sub-packaging, and filling into capsules to prepare the Wanchu capsules. Harmful impurities are reduced, and the overall stability is improved.