What are the side effects of triamterene and hydrochlorothiazide (HCTZ)?

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Triamterene-HCTZ may increase the risk for high potassium levels, which can become life-threatening if not treated. Talk to your doctor right away if you develop symptoms, such as very slow heartbeat or muscle weakness. Triamterene-HCTZ may also cause severe dehydration and excessive loss of important minerals, so if you have symptoms, such as extreme thirst, unusual decrease of urine production, muscle cramps, severe dizziness, irregular heartbeat, fainting, seizures or confusion, talk to your doctor right away. Some people may have an allergic reaction to triamterene-HCTZ, causing symptoms like hives, swelling in the face or throat and difficulty breathing. Talk to your doctor right away if you experience any of those symptoms. Other serious side effects of triamterene-HCTZ may include kidney stones, stomach pain, severe nausea or vomiting, numbness or tingling in the limbs and unusual bleeding or bruising. More common side effects of triamterene-HCTZ may include dizziness, nausea, constipation, diarrhea, blurred vision, headaches and increased sensitivity to the sun. Other side effects may occur, so talk to your doctor if you develop any new and unusual symptoms while taking triamterene-HCTZ.