Male catheterization involves threading a thin, flexible tube through the urethra and into the bladder to drain urine. The urethra in men is roughly 8 inches long and curves through the penis, past the prostate, and into the bladder, which makes the process more involved than it is for women. The entire procedure typically takes only a few minutes, but careful technique matters at every step.
How the Area Is Prepared
You’ll lie on your back with your legs slightly apart. The clinician sets up a sterile field, meaning all equipment is arranged on a clean, uncontaminated surface within arm’s reach. A sterile drape with an opening is placed over the pelvic area, leaving only the penis exposed.
The clinician holds the shaft of the penis with one hand (which from that point on is considered non-sterile and stays in place for the rest of the procedure). Using the other gloved hand, they clean the tip of the penis with antiseptic-soaked swabs, wiping in a circular motion starting at the urethral opening and moving outward. If you’re uncircumcised, the foreskin is retracted first. This cleaning step is critical for preventing urinary tract infections. CDC guidelines require sterile gloves, sterile drapes, an antiseptic cleaning solution, and a single-use packet of lubricant for every insertion.
Numbing and Lubrication
Before the catheter goes in, a numbing gel is usually squeezed directly into the urethra. The gel contains a local anesthetic, typically at a 2% concentration, and about 10 milliliters is instilled. For it to work, the gel needs to sit for several minutes. Protocols vary, but the wait ranges from about 3 to 10 minutes depending on the product used. This step reduces discomfort significantly as the catheter passes through sensitive areas.
What Happens During Insertion
The clinician holds the penis at a roughly 90-degree angle to straighten out the initial curve of the urethra, then slowly advances the lubricated catheter into the urethral opening. The tube is flexible and usually between 14 and 18 French in diameter for most adult men (roughly 4.7 to 6 millimeters across). Smaller or larger sizes exist, ranging from 12 to 24 French, but that middle range is the most common.
As the catheter advances, there are two spots where you’re likely to feel resistance or pressure. The first is at the external sphincter, a muscular ring about halfway along the urethra. Taking a slow, deep breath and consciously relaxing can help the catheter pass through. The second point of resistance is at the prostate gland. The urethra takes a roughly 30-degree turn here as it passes through the prostate and angles toward the bladder. In men over 50, this area is often narrower because the prostate naturally enlarges with age. About half of men between 50 and 60 have some degree of prostate enlargement that can make catheterization trickier.
Once the catheter reaches the bladder, urine begins flowing through the tube almost immediately. This is the confirmation that the catheter is in the right place.
Securing the Catheter
If the catheter is staying in (an indwelling or Foley catheter), a small balloon near the tip is inflated with sterile water to hold it inside the bladder. The other end connects to a drainage bag. If it’s a one-time, in-and-out catheterization, the urine is simply drained and the catheter is removed right away.
For indwelling catheters, the tube is secured to your thigh or abdomen with tape or a strap to prevent it from being accidentally tugged. The drainage bag must always hang below the level of your bladder, whether you’re standing, sitting, or lying down. This keeps urine flowing downward by gravity and prevents it from backing up into the bladder, which could cause infection.
What It Feels Like
Most men describe the sensation as an unusual pressure or a strong urge to urinate rather than sharp pain, especially when numbing gel is used. The moments when the catheter passes the sphincter and prostate tend to produce the most discomfort. Some burning or stinging at the urethral opening is normal. The discomfort is brief, lasting only the few seconds it takes the catheter to pass each resistance point.
When a Curved-Tip Catheter Is Needed
If a standard straight-tip catheter won’t pass, clinicians often switch to a Coudé catheter, which has a slight upward curve at the tip. This design helps navigate the natural bend where the urethra passes through the prostate. It’s particularly useful for men with an enlarged prostate or scar tissue from previous procedures. One study found that over 40% of patients who couldn’t be catheterized with a standard catheter were successfully catheterized with an 18-French Coudé tip.
Risks and Complications
The most common risk is a urinary tract infection. Strict sterile technique during insertion is the primary defense. If any piece of equipment touches a non-sterile surface, it’s discarded and replaced.
Urethral injury can occur if the catheter is forced past a point of resistance or if the balloon is inflated before the catheter fully reaches the bladder. Signs of injury include blood at the tip of the penis or pain that persists well after insertion. The urethra has a J-shaped curve in the deep bulbar region that makes it particularly vulnerable to a “false passage,” where the catheter punctures the urethral wall instead of following the natural channel. This is why clinicians advance the catheter gently and stop if they meet firm resistance.
Long-term or repeated catheterization can lead to urethral strictures, which are areas of scarring that narrow the urethra. This is one of the most common complications of urethral injury and can make future catheterizations more difficult.
Caring for a Catheter Afterward
If you go home with a catheter in place, the drainage bag attaches to your leg during the day (a smaller leg bag) and to a larger bedside bag at night. The bag should always sit below your waist. When walking, hold the tubing so the bag stays below your bladder. You can sleep in any position as long as the bedside bag is lower than your body. Empty the bag when it’s about half to two-thirds full to prevent it from pulling on the catheter.