UTIs in men are typically treated with a seven-day course of oral antibiotics. Unlike the shorter three-day courses often prescribed for women, men generally need a full week of treatment because the infection can involve the prostate or other parts of the urinary tract that are harder for antibiotics to reach. The specific antibiotic your doctor chooses depends on the bacteria involved, whether the infection has spread beyond the bladder, and whether you have any underlying conditions that complicate treatment.
Why UTIs Are Different in Men
UTIs are far less common in men than in women, largely because of anatomy. The longer male urethra makes it harder for bacteria to reach the bladder. When a man does develop a UTI, it often signals something else going on: an enlarged prostate partially blocking urine flow, kidney or bladder stones, scar tissue in the urethra, or catheter use. These underlying causes matter because they change both how the infection is treated and whether further testing is needed.
The European Association of Urology’s current guidelines no longer automatically classify male UTIs as “complicated” just because the patient is male. Instead, the focus is on whether the infection stays localized in the bladder (cystitis) or causes systemic symptoms like fever, chills, or flank pain. That distinction drives treatment decisions more than sex alone.
First-Line Antibiotics for Uncomplicated Cases
For a straightforward bladder infection without fever, the standard first-line options are trimethoprim, trimethoprim/sulfamethoxazole, and nitrofurantoin, each taken for seven days. A randomized trial confirmed that a seven-day course works just as well as longer courses in men with uncomplicated, non-febrile UTIs. Your doctor will usually collect a urine sample for culture before starting treatment, which helps confirm the right antibiotic choice and allows a switch if the bacteria turn out to be resistant.
It’s worth knowing that the traditional colony count threshold of 100,000 bacteria per milliliter of urine is no longer considered a hard cutoff. A true UTI can show lower counts on culture, and current expert guidance emphasizes treating based on symptoms rather than rigidly following that old number.
When the Prostate Is Involved
The prostate sits right at the base of the bladder, and in men with UTIs, bacteria frequently take up residence there. When acute bacterial prostatitis is suspected (typically because of fever, pelvic pain, or a tender prostate on exam), treatment lasts longer: 10 to 14 days at minimum, and up to four weeks in confirmed cases. Chronic bacterial prostatitis, where low-grade infection lingers in the prostate, can require 6 to 12 weeks of antibiotics.
The prostate is also picky about which antibiotics can penetrate its tissue effectively. Fluoroquinolones and trimethoprim/sulfamethoxazole are the two drug classes that reach therapeutic levels in prostate tissue and secretions. If your doctor suspects prostate involvement, that will narrow the antibiotic options compared to a simple bladder infection.
Complicated or Severe Infections
A complicated UTI means the infection has spread beyond the bladder, involves structural abnormalities, or occurs in someone with conditions like kidney stones, a catheter, or a recent urological procedure. When these infections cause systemic illness but not full sepsis, treatment typically involves stronger antibiotics from classes like cephalosporins or fluoroquinolones. If sepsis is present, initial treatment may include intravenous antibiotics in a hospital setting before transitioning to oral medication.
The 2025 guidelines from the Infectious Diseases Society of America recommend shorter courses even for complicated UTIs in patients who are improving: 5 to 7 days for fluoroquinolones and 7 days for other antibiotics, rather than the older standard of 10 to 14 days. Even men with complicated UTIs and bacteria in the bloodstream can often be treated with just 7 days if they’re responding well to therapy. The exception is suspected prostatitis, where longer courses remain the norm.
Managing Symptoms While Antibiotics Work
Antibiotics kill the bacteria, but they don’t immediately relieve the burning, urgency, and discomfort. Phenazopyridine is an over-the-counter urinary pain reliever that can help bridge that gap. The typical dose is 200 mg three times a day. It’s meant for short-term use, usually just the first day or two until antibiotics start working, and it will turn your urine bright orange, which is harmless but worth knowing about.
Staying well hydrated helps flush bacteria from the urinary tract and can ease discomfort. Avoiding caffeine and alcohol, both of which irritate the bladder, also makes the recovery period more tolerable.
When Further Testing Is Needed
A straightforward first-time UTI that responds to antibiotics usually doesn’t require imaging or additional workup. But if the infection doesn’t improve with treatment, keeps coming back, or presents as a complicated infection, your doctor will likely order a kidney and bladder ultrasound or a CT scan of the abdomen and pelvis. The goal is to identify structural problems like an enlarged prostate blocking urine flow, kidney stones, urethral scarring, or, less commonly, tumors.
Recurrent UTIs in younger men are unusual enough that they warrant investigation for chronic bacterial prostatitis, even if symptoms between episodes seem mild. In older men, an enlarged prostate is the most common culprit. Identifying and addressing the underlying cause is often the only way to break the cycle of repeated infections.
Reducing the Risk of Recurrence
Once you’ve had a UTI, a few habits can lower the odds of another one. Urinating after sexual activity helps clear bacteria from the urethra. Staying well hydrated keeps urine dilute and flowing regularly, which makes it harder for bacteria to establish an infection. Showers are preferable to baths, as sitting in bathwater can introduce bacteria to the urethral opening.
For men with recurrent infections tied to chronic prostatitis, long-term low-dose antibiotic therapy is sometimes used as a suppressive strategy. This approach keeps bacterial levels in the prostate too low to cause symptomatic flare-ups, though it doesn’t always eradicate the underlying infection entirely. Men with structural causes like an enlarged prostate or urethral strictures may need procedural treatment of the obstruction itself to meaningfully reduce infection risk.