Serious side effects of VESICARE may include: hot, dry skin and extreme thirst, severe stomach pain, or constipation for 3 days or longer, pain or burning when you urinate, urinating less than usual or not at all dry mouth, dry eyes, blurred vision, mild constipation, nausea, mild stomach pain or upset, dizziness, tired feeling, fever, sore throat, body aches, or other flu symptoms Seek emergency medical attention if you have signs of an allergic reaction such as hives, difficulty breathing and/or swelling of your face, lips, tongue, or throat. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about additional side effects or any side effect that bothers you or that do not go away.