Hello, the drug you mentioned is cimetidine, and cimetidine does have the effect of treating urticaria. Cimetidine is a kind of H2 receptor antagonist in human skin and blood vessels, which has immune enhancement effects, such as enhancing delayed hypersensitivity, increasing the number of resistant T cells and consuming helper T cells, which is beneficial to resist the balance reversal of T cells, leading to a significant decrease in IgE level, thus alleviating allergic symptoms.