Contact your doctor if you notice symptoms of liver problems, including abdominal pain, clay-colored stools, a slow or abnormal heart rate, itchiness, yellow eyes or skin, vomiting, nausea, dark or discolored urine, fever or headaches. Some people taking benazepril-HCTZ may experience high potassium levels, or hyperkalemia, a potentially serious problem. Inform your doctor promptly of hyperkalemia symptoms, such as breathing troubles, stomach pain, nausea or vomiting, tingling or numbness or weak or heavy feeling legs. Other severe symptoms include: extreme thirst, increased urination, dry mouth, a red, blistering or peeling rash, decreased or absent urination, weight gain, fever or chills. Contact your doctor if you notice these symptoms. Benazepril-HCTZ may cause lightheadedness or dizziness, especially if you are sweating, exercising or suffer from an ailment that causes excess urination, vomiting or diarrhea. Less serious symptoms include: a cough, blurred vision, increase sweating and a mild skin rash. Contact your doctor if these symptoms persist or worsen.