Broad-spectrum antiviral drug. It has the effect of inhibiting the growth of multiple viruses such as respiratory syncytial virus, influenza virus, hepatitis A virus, adenovirus, etc. in vitro. After entering the virus-infected cells, the drug is rapidly phosphorylated, and its product acts as a competitive inhibitor of viral synthase, inhibiting inosine monophosphate dehydrogenase, influenza virus RNA polymerase and mRNA guanosine transferase, thereby causing a decrease in intracellular guanosine triphosphate, impairing viral RNA and protein synthesis, and inhibiting viral replication and transmission. It may also have an immune effect and neutralizing antibody effect on respiratory syncytial virus.

This product is an anticholinergic drug that can block the excitation of the iris sphincter and ciliary muscle caused by acetylcholine. Its 0.5% solution can cause mydriasis; 1% solution can cause ciliary muscle paralysis and mydriasis.

A selective α1 receptor antagonist that can inhibit the rise in blood pressure caused by α1 receptors. It has a hypotensive effect on a variety of hypertensive animal models, with a long duration of hypotensive effect, and does not cause reflex tachycardia during hypotensive treatment. No obvious first-dose effect or drug resistance was observed after multiple oral administrations. It can reduce the total peripheral resistance of anesthetized open-chest dogs, dilate peripheral blood vessels, and has no significant effect on cardiac output. It can also relieve the sympathetic tension of the prostate and urethra caused by the excitement of the receptor through the α1 receptor blocking effect, reduce the intraurethral pressure, and improve symptoms such as urination disorders caused by benign prostatic hyperplasia.

Intraperitoneal injection of the drug into mice with cholestatic jaundice induced by 1-naphthyl isothiocyanate can reduce serum aspartate aminotransferase, alanine aminotransferase and serum conjugated bilirubin levels, and alleviate liver cell damage in the model animals.

Azithromycin is a 15-membered macrolide antibiotic that has antibacterial effects on a variety of Gram-positive aerobic bacteria, Gram-negative aerobic bacteria, anaerobic bacteria, sexually transmitted disease microorganisms and other microorganisms. It mainly binds to the 50S subunit of the bacterial ribosome and inhibits RNA-dependent protein synthesis.