Taking Atorvastatin Calcium Tablets does not cause patients to develop black stools, which are considered to be related to gastrointestinal bleeding and diet. Atorvastatin calcium tablets reduce plasma cholesterol and lipoprotein levels and are commonly used clinically to treat hypercholesterolemia and coronary artery disease. Adverse effects of this drug include rhabdomyolysis and myopathy, liver enzyme abnormalities, body fever, and other systemic adverse effects, and gastrointestinal adverse effects such as abdominal discomfort, belching, flatulence, hepatitis, and cholestasis, which do not result in black stools in patients. Atorvastatin calcium tablets are contraindicated in patients with pregnancy, lactating women, active liver disease, and allergies. Clinical black stools may be related to gastrointestinal bleeding, patients can improve the fecal occult blood test, according to the results to determine whether there is bleeding. If the fecal occult blood test is negative, this time may be related to diet, for example, after eating mulberry, may lead to black stool. The appearance of black stools should not be ignored, it is recommended to improve the fecal occult blood test in a timely manner.