Introduction: Mesalazine is widely used in the treatment of the acute and maintenance phase of ulcerative colitis (UC). The possibility of interstitial lung disease being induced by mesalazine in the form of eosinophilic pneumonia. organizing pneumonia. and nonspecific interstitial pneumonia has been acknowledged for decades. https://www.parisnaturalfoodes.shop/product-category/betaine-hydrochloride/