Azelastine hydrochloride and its main metabolite are histamine H1 receptor antagonists with antihistamine effects.

This product is a rifamycin derivative and is the first non-aminoglycoside intestinal antibiotic. It has good antibacterial activity against Staphylococcus aureus, Staphylococcus epidermidis and Streptococcus faecalis among Gram-positive aerobic bacteria, and against Salmonella, Escherichia coli, Shigella and Yersinia enterocolitica among Gram-negative aerobic bacteria. This product has high antibacterial activity against Proteus, Clostridium difficile among Gram-positive anaerobic bacteria, and Bacteroides among Gram-negative anaerobic bacteria. This product is not absorbed and maintains extremely high concentrations in the intestine, while it does not exist in other organs. When using this product, there is no need to use intestinal antispasmodics (such as lopramamide, etc.) or intestinal adsorbents (such as white clay, pectin, etc.). This product acts quickly, and diarrhea will no longer occur after 2 days, and abdominal cramps, headaches, nausea, and vomiting symptoms will disappear quickly. This product is superior to neomycin, streptomycin and other aminoglycoside antibiotics in the following features: ① It does not damage hearing function; ② It does not cause renal damage; ③ The parasitic normal flora, especially the non-pathogenic intestinal bacteria Escherichia coli, quickly relocate to the intestines to avoid repeated infection; ④ Intestinal mucositis may tend to disappear.

This product is a 4-azasteroid compound that is a specific inhibitor of the intracellular enzyme type II 5-reductase in the process of testosterone metabolism into the more potent androgen dihydrotestosterone (DHT). This product is very effective in reducing DHT in the blood and prostate. Finasteride has no affinity for androgen receptors.