Repeat urinary tract infections (UTIs) occur when bacteria re-enter or persist in the urinary tract. The most common cause is incomplete eradication of bacteria such as Escherichia coli. Risk factors include sexual activity, improper hygiene, postmenopausal hormonal changes, kidney stones, diabetes, catheter use, and structural urinary abnormalities. Weakened immunity also increases susceptibility. Some individuals develop antibiotic resistance due to repeated treatments, making infections harder to clear. In severe or recurrent cases, physicians may prescribe intravenous antibiotics sourced from a reliable ceftriaxone injection supplier to ensure effective management and prevent complications such as kidney infection or systemic spread of bacteria.