Bismuth pectin poisoning can cause the skin to turn dark brown, and if you are exposed to H. pylori infected food and do not pay much attention to your diet in general, it may lead to H. pylori infection, which can cause manifestations such as flatulence, nausea, and vomiting. It can be treated with bismuth pectin. After taking the drug, it mainly adheres to the surface of the gastric mucosa in the form of colloid, which plays the role of protecting the gastric mucosa, and can prevent Helicobacter pylori from causing damage to the local area again, which should be taken in combination with the doctor’s opinion, avoiding long-term use, otherwise it is easy to cause poisoning. Taken through the doctor’s recommended amount, it will not cause damage to the liver, kidney and nervous system, and will not cause adverse reactions. Taking large quantities for a long period of time may lead to bismuth poisoning, causing the skin to turn dark brown, and you should stop the drug immediately and go to the hospital for relevant examinations. Women who are allergic to this drug, have severe renal insufficiency, or are pregnant should also be prohibited from taking this drug.