After taking coronary heart Shutong capsule stools may become black, but cause the appearance of black stools may also be related to diet, gastrointestinal tract lesions and other factors, so the specific causes need to be clearly diagnosed through the relevant examination, and then take the appropriate therapeutic measures. Coronary Heart Shutong Capsule is composed of Guangzhao, Salvia miltiorrhiza, Clove, Ice Tablet and Geranium. It has the efficacy of activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body), activating meridians and activating collaterals, and promoting qi and relieving pain (relieving pain by regulating the body’s qi). It is used for chest pain, chest tightness, panic and shortness of breath caused by chest paralysis (chest tightness and pain), cardio-blood stasis (insufficient qi in the heart and obstruction of blood circulation); angina pectoris of coronary heart disease with the above symptoms. Individual patients with nausea, stomach upset and other gastrointestinal adverse reactions. Pregnant women are prohibited, lactating women should be cautious; severe angina should not be used alone, can be combined with nitroglycerin and other drugs. If you need to take this drug, it is recommended to do so under the guidance of a doctor.