Urinary retention is treated based on whether it comes on suddenly or develops gradually. Acute retention, where you suddenly can’t urinate at all, requires immediate bladder drainage with a catheter. Chronic retention, where your bladder doesn’t fully empty over time, is managed with medications, behavioral techniques, self-catheterization, or surgery depending on the underlying cause.
Acute Retention Requires Immediate Drainage
If you suddenly cannot urinate and your bladder feels painfully full, this is a medical emergency. The first step is catheterization, where a thin, flexible tube is inserted through the urethra to drain the bladder. A numbing gel is applied to the urethra beforehand to reduce discomfort. In most cases, this provides immediate relief.
When a standard catheter can’t pass, often because of an enlarged prostate blocking the path, a larger catheter with a curved tip may be used. If the urethra is injured or a catheter still can’t get through, a suprapubic catheter is placed instead. This involves inserting a tube directly through the lower abdomen into the bladder, guided by ultrasound. Hospital admission is typically needed when retention is caused by infection that has spread to the bloodstream, cancer-related obstruction, or spinal cord compression.
How Doctors Diagnose the Severity
After the immediate crisis is handled, or if retention has been building slowly, your doctor will measure how much urine stays in your bladder after you try to empty it. This is called a post-void residual volume, measured by a quick, painless ultrasound scan of the bladder.
Less than 100 mL remaining is normal. Up to 200 mL may still be acceptable depending on the situation. Over 200 mL signals that the bladder isn’t emptying well, and anything over 400 mL is considered diagnostic of urinary retention. These numbers help determine how aggressively retention needs to be treated.
Medications That Help the Bladder Empty
For retention caused by an enlarged prostate, the most common first-line medications are alpha-blockers. These drugs relax the smooth muscle in the prostate and bladder neck, making it easier for urine to flow. Tamsulosin is the most widely prescribed, typically at 0.4 mg daily. Other options include alfuzosin, doxazosin, silodosin, and terazosin. They tend to work within days to weeks.
Alpha-blockers also improve the chances of successfully urinating again after a catheter is removed, a process called a trial without catheter. Studies show that alfuzosin increased success rates to about 60% compared to 39% with a placebo. Tamsulosin showed similar results: 47% success versus 29% with placebo. Your doctor will often start you on one of these medications before removing a catheter placed for acute retention.
For men with significantly enlarged prostates, a second class of medication can shrink the gland itself. These drugs, which include finasteride and dutasteride, block a hormone that drives prostate growth. They reduce prostate volume by roughly 25%, but this takes time. Most of the shrinkage happens over six months, and maximum effect can take up to a year. They’re often used alongside alpha-blockers for a combined approach, as shown in a major trial of nearly 5,000 men who took both tamsulosin and dutasteride together over four years.
Self-Catheterization for Ongoing Retention
When medications aren’t enough or the bladder muscle itself is too weak to empty fully, clean intermittent self-catheterization becomes the primary management strategy. You insert a small catheter yourself several times a day to drain the bladder, then remove it. It sounds daunting, but most people learn the technique quickly and manage it independently at home.
The typical schedule is every four hours during the day and every six hours overnight, though this varies based on how much you drink and how much urine your bladder holds. The goal is to keep the bladder below 500 mL at all times, since overdistension can damage the bladder wall and worsen retention over time.
The process itself is straightforward. You clean your hands with soap and water or alcohol gel, then clean the genital area with mild soapy water or unscented wipes. The catheter should not be touched directly with bare hands. Many modern catheters come with a no-touch sleeve or closed system designed for this. For women, wiping downward away from the urethra is important to prevent introducing bacteria. For men, the foreskin should be retracted and the tip of the penis cleaned before insertion. Most catheters today are single-use. Reusable catheters, when prescribed, should be rinsed after each use, stored in a disinfecting solution, and replaced every four weeks.
Behavioral Techniques for Incomplete Emptying
If your retention is mild and you’re able to urinate but not fully empty, a technique called double voiding can help. The idea is simple: urinate once, wait, then try again.
Sit comfortably on the toilet and lean slightly forward with your hands resting on your knees or thighs. This position optimizes pressure on the bladder. Urinate as normally as you can, focusing on emptying completely. Then stay seated, wait 20 to 30 seconds, lean a bit further forward, and urinate again. Some people find that rocking gently side to side helps release additional urine. Another variation is standing up and walking around for about 10 seconds before sitting back down and trying again. One important rule: never strain or bear down forcefully, as this can weaken the pelvic floor muscles over time and make the problem worse.
Surgical Options When Other Treatments Fail
When medications and catheterization aren’t providing adequate relief, particularly for prostate-related retention, surgical procedures can remove or reposition the tissue causing the blockage.
Transurethral resection of the prostate (TURP) has been the standard surgical approach for decades. A small instrument is passed through the urethra to remove excess prostate tissue. It’s effective but requires general or spinal anesthesia and typically involves a hospital stay. Recovery takes several weeks, and there are potential side effects including changes to sexual function and, less commonly, urinary incontinence.
A newer, minimally invasive alternative called UroLift uses small implants to hold the enlarged prostate tissue apart, like pulling back curtains, rather than cutting tissue away. It can be performed under local anesthesia, and nine out of ten patients don’t need a catheter afterward. Recovery is faster, with quicker return to normal activity compared to TURP. Studies have shown symptom improvements in both procedures over two-year follow-up periods, though UroLift appears to carry fewer side effects related to sexual function and continence.
Nerve Stimulation for Non-Obstructive Retention
Not all retention is caused by a physical blockage. When the nerves controlling the bladder don’t function properly, whether from multiple sclerosis, spinal cord injury, or other neurological conditions, the bladder muscle may simply fail to contract. In these cases, sacral neuromodulation can help. A small device, similar to a pacemaker, is implanted near the tailbone to send mild electrical pulses to the nerves that control bladder function.
Before permanent implantation, patients undergo a test phase to see if they respond. In a multicenter trial, about half of patients with neurological bladder dysfunction showed significant improvement during testing. Among those who went on to receive the permanent implant, 76% maintained successful results after two months of active stimulation. This option is generally reserved for people who haven’t responded to medications or catheterization.
Medications That Can Cause or Worsen Retention
Up to 10% of male urinary retention cases are directly linked to medication side effects. If you’re experiencing new or worsening retention, it’s worth reviewing everything you take, including over-the-counter drugs.
The most common culprits are antihistamines like diphenhydramine (found in many sleep aids and allergy medications) and decongestants containing pseudoephedrine or phenylephrine. Older antidepressants such as amitriptyline and nortriptyline are known offenders, as are opioid pain medications, muscle relaxants like cyclobenzaprine, and certain antipsychotic drugs. Bladder-calming medications prescribed for overactive bladder, which work by reducing bladder contractions, can paradoxically push someone with borderline retention into full-blown inability to urinate.
Even common cold medications can tip the balance. If you already have a mildly enlarged prostate, taking an antihistamine or decongestant for a few days can be enough to trigger acute retention. Adjusting or stopping the offending medication, when possible, sometimes resolves retention without any other intervention.
What Happens if Retention Goes Untreated
Chronic retention that isn’t addressed can cause serious damage beyond the bladder. When urine consistently backs up, it can create pressure that travels upward through the ureters to the kidneys, causing a condition called hydronephrosis, or swelling of the kidney. Over time, this sustained pressure destroys kidney tissue. Standard blood tests for kidney function often miss early damage, since creatinine levels don’t reliably rise until significant function is already lost. By the time routine labs look abnormal, the injury may be advanced. Complete obstruction that isn’t relieved urgently can render a kidney nonfunctional. This is why ongoing monitoring, including periodic ultrasounds and post-void residual measurements, matters even when retention feels manageable.