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.

It has a strong antitussive effect, and has antihistamine, smooth muscle spasm relief, anti-inflammatory and local anesthetic effects. The antitussive effect usually appears 30-60 minutes after taking the medicine, and the effect lasts for 4-6 hours or longer.

It has anti-inflammatory, antipyretic and analgesic effects. Its mechanism of action is to reduce the synthesis of prostaglandins by inhibiting cyclooxygenase. It stops the formation of pain nerve impulses in inflammatory tissues and inhibits inflammatory reactions, including inhibiting the chemotaxis of leukocytes and the release of lysosomal enzymes. As for the antipyretic effect, it acts on the hypothalamic temperature regulation center, causing peripheral vasodilation and sweating, which increases heat dissipation. This central antipyretic effect may also be related to the inhibition of prostaglandin synthesis in the hypothalamus.

It participates in some metabolic reactions in the body, can fight against the peroxidation of free radicals, delay aging, protect the skin, enhance ovarian function, and prevent habitual abortion.

Dilate the coronary arteries, femoral arteries, and cerebral arteries, increase cerebral blood flow, strengthen blood circulation in the limbs, reduce blood viscosity, weaken vascular resistance, reduce myocardial oxygen consumption, improve cardiac function, enhance microcirculation, increase peripheral blood flow, change blood rheology, lower blood pressure, and improve heart rhythm