what antibiotics treat a uti
For an uncomplicated urinary tract infection (UTI), doctors usually choose from a short list of first‑line antibiotics that are effective and have relatively low resistance rates.
First‑line antibiotics for a UTI
These are the most commonly prescribed options for simple bladder infections in otherwise healthy adults:
- Nitrofurantoin (Macrobid, Macrodantin) – usually taken for 5–7 days ; works well for lower‑tract UTIs but is not used for kidney‑involving infections.
- Trimethoprim‑sulfamethoxazole (Bactrim, Septra) – typically given for 3 days ; effectiveness can vary by region due to resistance.
- Fosfomycin (Monurol) – often a single‑dose treatment; good choice if resistance to other drugs is a concern.
Other common UTI antibiotics
If the first‑line options are not suitable (allergy, resistance, pregnancy, kidney disease), providers may use:
- Cephalexin (Keflex) – a cephalosporin taken for 7–10 days.
- Amoxicillin‑clavulanate (Augmentin) – used when other preferred antibiotics are not appropriate.
- Ciprofloxacin or levofloxacin – fluoroquinolones reserved for complicated or more severe UTIs because of stronger side‑effect risks.
For very severe or complicated UTIs (e.g., kidney infection, hospitalization), intravenous antibiotics like ceftriaxone, ampicillin‑sulbactam, or carbapenems may be used.
What you should know
- The “best” antibiotic depends on your local resistance patterns, allergies, kidney function, pregnancy status, and whether the infection is simple or complicated.
- Always finish the full course, even if symptoms improve quickly, to reduce the chance of recurrence or resistance.
If you tell me whether you’re pregnant, have kidney issues, or are allergic to certain drugs, I can help outline which classes are more or less likely to be chosen in your situation.