It selectively relaxes the ballistic smooth muscle and directly inhibits the sphincter of Oddi in the biliary tract, thereby relaxing the biliary sphincter and reducing the resistance to passage through the common bile duct and the duodenum. It also reduces the pressure inside the gallbladder and bile duct, promotes the discharge of bile and pancreatic juice, improves appetite, and eliminates abdominal distension. It has antispasmodic, analgesic and choleretic effects.

It combines with adenosine triphosphate to form vitamin B1 pyrophosphate (thiamine diphosphate, cocarboxylase), which is a coenzyme necessary for carbohydrate metabolism; it can inhibit the activity of cholinesterase. When it is deficient, the activity of cholinesterase is enhanced, the hydrolysis of acetylcholine is accelerated, causing nerve impulse conduction disorders, and affecting gastrointestinal and myocardial function.

Tetracycline antibiotics. This product is a broad-spectrum antibacterial agent. Many Rickettsia, Mycoplasma, Chlamydia, and Spirochete are sensitive to this product. Enterococci are resistant to it. Others such as Actinomycetes, Bacillus anthracis, Listeria monocytogenes, Clostridium, Nocardia, Vibrio, Brucella, Campylobacter, Yersinia, etc. are also sensitive to this product. There is cross-resistance between this product and different varieties of tetracycline antibiotics. The mechanism of action of this product is that the drug can specifically bind to the A position of the 30S subunit of the bacterial ribosome, inhibit the growth of the peptide chain and affect the synthesis of bacterial proteins.