There is no single “best” antibiotic for chronic or recurrent cystitis. With only slight blood in urine and otherwise normal reports, do not start or repeat antibiotics unless a clean-catch urine culture with antibiotic sensitivity confirms a bacterial infection.

Antibiotics commonly used for a confirmed uncomplicated bladder infection include nitrofurantoin, fosfomycin, or trimethoprim-sulfamethoxazole, but the right choice depends on the culture result, allergies, kidney function, pregnancy status, sex, prior antibiotic use, and local resistance. Repeated antibiotics without infection can cause resistance and may miss another cause of blood in the urine.

Important: blood in urine is not automatically “cystitis.” Ask for:

The 2025 AUA guidance uses a risk-based approach for microscopic blood in urine; low-risk patients may have repeat microscopy, while higher-risk cases need imaging and/or cystoscopy. Visible blood generally needs more prompt urologic assessment. See the AUA hematuria guidance and its 2025 guideline update.

Seek urgent care today if there are blood clots, inability to pass urine, fever/chills, flank or severe abdominal pain, vomiting, dizziness, or worsening bleeding.