What are the side effects of triamterene?

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Serious allergic side effects of taking triamterene will cause your face, lips, tongue, and throat to swell making it difficult to breathe. Stop using triamterene and get immediate emergency help if this occurs. You should stop using this medication and call your doctor immediately if you have any serious side effects such as numbness or tingly feeling, muscle pain or weakness, slow, fast, or uneven heartbeat, feeling drowsy, restless, or light-headed, little or no urination, shallow breathing, tremors, confusion, nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, and jaundice. You can continue to use triamterene but should talk to your doctor if you have any of these less serious side effects that include mild nausea, vomiting, or diarrhea, dizziness, headache, dry mouth, or skin rash.