As a histamine H1 receptor antagonist, this product can counteract the capillary dilation caused by allergic reactions, reduce the permeability of capillaries, and relieve wheezing caused by bronchial smooth muscle contraction. This product has a long-lasting antihistamine effect and also has a significant central inhibitory effect, which can increase the effects of anesthetics, analgesics, hypnotics and local anesthetics. This product is mainly metabolized in the liver.

Ganciclovir is a guanine antiviral drug. It is a homologue of acyclovir, but has a stronger effect, especially against cytomegalovirus in AIDS patients. After entering the cell, it is rapidly phosphorylated to form a monophosphate compound, and then converted into a triphosphate compound by the action of cellular kinase. In cells infected with cytomegalovirus, the phosphorylation process is faster than that in normal cells. Triphosphates can competitively inhibit DNA polymerase and are incorporated into the DNA of viruses and host cells, thereby inhibiting DNA synthesis. The inhibitory effect on viral DNA polymerase is stronger than that on host cell DNA polymerase.

It can cause blood vessels to contract, reduce capillary permeability, enhance platelet aggregation and adhesion, promote platelets to release coagulation active substances, shorten coagulation time, and achieve hemostatic effect.