Hello, delirium during the course of a severe UTI usually means that the UTI has caused severe sepsis or septic shock. Amoxicillin is not the best choice in such cases. You should contact your doctor as soon as possible for an immediate assessment and perhaps change in treatment. Patients with altered consciousness during an infection usually require hospitalization. I hope you find my comments helpful! You can contact me again, if you d like any clarification or further information. Kind Regards!