The presence of black stool in patients with cirrhosis suggests the presence of upper gastrointestinal bleeding, and it is best not to take drugs orally during this period. This is because: 1. some drugs have large particles, which can easily damage the gastric mucosa and lead to reissue of blood. 2. some drugs are inherently irritating and are prone to vomiting after taking them, causing increased pressure in the stomach and inducing bleeding. There are some drugs that have a therapeutic effect on gastrointestinal bleeding themselves, such as Yunnan Baiyao, which can be taken after dissolving the granules in water. For patients with cirrhosis, the safest way to take medication is to wait until the stool turns yellow.