Ambidex is the trade name and generic name for bivalirudin capsules, and reddening of urine may be normal after using the drug. This medication is indicated for the treatment of osteoarthritis of the hip and knee joints. The metabolites of bivalirudin may turn the urine brown to red, so do not worry too much. Because it changes the color of the urine, kidney function should be checked regularly if the drug is taken for a long time. Adverse reactions such as diarrhea, abdominal pain, frequent bowel movements, soft stools, and flatulence may occur after use of the drug, with some patients experiencing more severe diarrhea. This medication can damage the liver, so patients with a history of liver disease should limit its use, and alcohol consumption should be restricted. Allergic to this drug or the components of the formula, patients with intestinal obstruction or pseudo-obstruction, patients with abdominal pain of unknown origin, patients with inflammatory bowel disease, patients with lactose intolerance, people under 18 years of age should not use it, breastfeeding women, pregnant women, it is forbidden to use this drug. The specific dosage and usage of the above drugs should follow the doctor’s instructions, and should not be used on their own to avoid adverse reactions.