Alfuzosin is a prescription medication used to treat the urinary symptoms caused by an enlarged prostate, a condition known as benign prostatic hyperplasia (BPH). It works by relaxing the muscles around the prostate and bladder neck, making it easier to urinate. Sold under the brand name Uroxatral, it’s taken as a once-daily extended-release tablet.
How Alfuzosin Helps With BPH Symptoms
As the prostate enlarges, it squeezes the urethra and tightens the muscles around the bladder neck. This creates the familiar cluster of symptoms: a weak stream, difficulty starting urination, frequent trips to the bathroom, and waking up multiple times at night to urinate. Alfuzosin targets specific receptors on the smooth muscle in the prostate, bladder base, and bladder neck. By blocking those receptors, it relaxes the muscle tissue and opens the passageway for urine.
The effect is measurable within hours. A study published in the journal Urology found that urine flow rate increased significantly as soon as eight hours after the first dose, and the improvement persisted for at least four days. Over longer use, symptom scores drop by roughly 32%, and nighttime urination typically decreases from about 2.3 episodes per night to 1.8. For men whose flow was most restricted at the start, peak flow rate improved from about 8.3 ml/sec to nearly 14 ml/sec over six months.
How to Take It
Alfuzosin is taken once daily as a 10 mg extended-release tablet, immediately after a meal. Taking it on an empty stomach changes how the drug is absorbed and should be avoided. For the most consistent effect, take it after the same meal each day. The tablet needs to be swallowed whole. Crushing, splitting, or chewing it breaks the extended-release design, which can cause too much of the drug to enter your system at once.
Common Side Effects
Most people tolerate alfuzosin well. In clinical trials, the most frequently reported side effects were dizziness (5.7% of patients, compared to 2.8% on placebo) and headache (3.0% vs. 1.8% on placebo). Drops in blood pressure upon standing, which can cause lightheadedness, occurred in less than 1% of patients. These effects are generally mild and tend to settle down as your body adjusts to the medication.
How It Compares to Tamsulosin
Tamsulosin (Flomax) is the other widely prescribed alpha blocker for BPH, and both medications are similarly effective at improving urinary symptoms. The key difference is their effect on sexual function. In a controlled study of healthy volunteers, tamsulosin decreased ejaculate volume in nearly 90% of participants and caused complete absence of ejaculation in about 35%. Alfuzosin, by contrast, showed no meaningful difference from placebo: ejaculate volume was essentially unchanged, and no participants experienced complete loss of ejaculation. For men concerned about ejaculatory side effects, this distinction is often a deciding factor.
Off-Label Use for Kidney Stones
Alfuzosin is also used off-label to help pass ureteral stones, the type of kidney stone that gets stuck in the tube between the kidney and the bladder. Major urology guidelines recognize alpha blockers as an initial treatment option for uncomplicated stones smaller than 10 mm. The same muscle-relaxing action that opens the bladder neck also relaxes the ureter, giving the stone more room to pass.
A large systematic review of 55 randomized trials found that alpha blockers increased stone passage rates from about 48% to 76%. Patients who took an alpha blocker also passed their stones nearly four days sooner on average, had fewer pain episodes, and were significantly less likely to need surgery or hospitalization. The benefit was most pronounced for larger stones (5 to 10 mm), where treatment increased the chance of passage by 57%. For very small stones that would likely pass on their own, the added benefit was minimal. Alfuzosin, tamsulosin, and other alpha blockers in this class performed equally well.
Who Should Not Take Alfuzosin
Alfuzosin is not appropriate for everyone. It is contraindicated in people with moderate or severe liver impairment because the liver cannot clear the drug efficiently, leading to dangerously high blood levels. It also cannot be combined with potent inhibitors of the CYP3A4 enzyme pathway, a group of drugs that includes certain antifungals and antivirals. These medications can more than double the amount of alfuzosin circulating in the blood. Even moderately potent CYP3A4 inhibitors, such as certain calcium channel blockers used for blood pressure, can raise alfuzosin levels enough to warrant caution.
Alfuzosin is approved only for men. It has not been studied or approved for use in women or children.