We have studied the morphological, morphometric parameters of the liver of white rats. Against the background of polypharmacy, when using non-steroidal anti-inflammatory drugs, it was revealed in the structure of the liver, which led to various damage to the liver parenchyma. The simultaneous use of non-steroidal anti-inflammatory drugs leads to acute or chronic liver failure in rats. The longer the therapy for chronic diseases, the more pronounced morphological changes (necrosis, fibrosis, and cholestasis).