It has been found that the Tibetan drug Arenaria kansuensis has significant inhibitory action on edema in the ears of mice induced by cotton oil and granuloma, on acute inflammation in the form of swollen feet of rats induced by albumen injection and carrageenan, on phagocytosis of histiocytes in the abdomen of mice, and on the formation of antibody (serum HC50). Being low in toxicity, the drug is conducive to the smooth functioning of the liver and kidney.