Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using trospium and call your doctor at once if you urinate less than usual or not at all.
Less serious side effects may include:
- dry mouth or throat;
- dry eyes, blurred vision;
- constipation;
- stomach pain, bloating, gas;
- drowsiness, or
- mild skin rash.



