Warnings of side effects pertaining to triamterene include diarrhea, loss of appetite, nausea and weakness. Severe side effects include hives, difficulty breathing, tightness in the chest, swelling of the facial area, and slow or irregular heart rate, according to Drugs.com.
Triamterene is not recommended for people that take potassium supplements or people that have complications urinating. Triamterene is also unsuitable for people with high blood potassium levels, or a decreased liver function, says Drugs.com.
Triamterene is used to reduce edema caused by congestive heart failure, liver and kidney disease. It works by increasing urine production, allowing the body to eliminate excessive water and sodium, while also preventing the body from losing too much potassium, claims WebMD.