Enlarged Prostate Medicines: Alpha Blockers, 5-Alpha Reductase Inhibitors, Tadalafil, and Bladder Drugs

Daily pills are a common way to manage urinary symptoms from an enlarged prostate, also called benign prostatic hyperplasia, or BPH. Different medicines work in different ways. Some relax tight muscle around the urine tube. Some slowly shrink prostate tissue. Others help calm bladder urgency or treat urinary symptoms and erection problems together.

Medicines Used for Enlarged Prostate

Choosing the right medicine depends on the main cause of the urinary symptoms. Some men mainly have a slow stream. Others mainly have urgency, frequency, or night urination. Many have a mixture of both.

A clean medical infographic diagram of a male pelvis side-view cross-section mapping how enlarged prostate medications work. Colored callout arrows indicate targets: Alpha Blockers relaxing the prostate muscle collar, 5-Alpha Reductase Inhibitors shrinking prostate tissue over time, Tadalafil relaxing lower urinary tract smooth muscle, and Bladder Drugs calming the bladder muscle.
How BPH Medications Work: This patient-friendly infographic illustrates exactly where different enlarged prostate medications target the male urinary tract to relieve symptoms. From relaxing muscle collars to shrinking prostate tissue and calming bladder spasms, understanding these mechanisms helps patients navigate their BPH treatment options more effectively.

When BPH causes bothersome urinary symptoms, lifestyle changes may not be enough. Prescription medicines are often used before procedures are considered.

The main medicine groups include alpha blockers, 5-alpha reductase inhibitors, tadalafil, and bladder medicines. The best choice depends on prostate size, urine flow, bladder emptying, symptoms, side effects, other health conditions, and patient preference.

Table: Summary Matrix of Enlarged Prostate (BPH) Medications

Drug Class Common Examples How It Works Time to Relief Primary Side Effects
Alpha Blockers Tamsulosin, alfuzosin, silodosin Relaxes smooth muscle in the prostate and bladder neck. Days to weeks Dizziness, lightheadedness, nasal congestion, ejaculation changes.
5-Alpha Reductase Inhibitors Finasteride, dutasteride Lowers DHT to slowly shrink prostate tissue. 3 to 6 months or longer Lower libido, erection or ejaculation changes, breast tenderness, lowers PSA.
PDE-5 Inhibitors Tadalafil 5 mg daily Relaxes lower urinary tract smooth muscle and may help erections. 1 to 4 weeks Headache, indigestion, flushing, back pain; avoid with nitrates.
Bladder Stabilizers Mirabegron, vibegron, solifenacin, oxybutynin Calms bladder urgency or helps the bladder relax during filling. 1 to 4 weeks Dry mouth and constipation with antimuscarinics; possible blood pressure rise with mirabegron.

Alpha Blockers for BPH Symptoms

Alpha blockers are often used first for bothersome urinary symptoms from BPH. They work quickly because they relax muscle rather than shrink the prostate.

How Alpha Blockers Relax Prostate Muscle

The prostate and bladder neck contain smooth muscle. When this muscle is tight, it can narrow the urine passage and make urination harder.

Alpha blockers relax smooth muscle in the prostate and bladder neck. This helps open the urine channel and makes it easier for urine to pass.

Common examples include tamsulosin, alfuzosin, silodosin, doxazosin, and terazosin.

Common Alpha Blocker Side Effects

Alpha blockers can also affect blood vessels, so some men may feel dizzy or lightheaded, especially when standing up quickly. This is more common with some alpha blockers than others.

Other possible side effects include tiredness, headache, stuffy nose, and ejaculation changes. Some men may have little or no semen come out during orgasm. This is called dry orgasm or retrograde ejaculation. It is usually not harmful, but it can be bothersome.

Why Alpha Blockers Work Quickly

Alpha blockers can start helping within days to weeks. They do not shrink the prostate. They work by relaxing the muscle around the urine channel.

Many men notice a stronger stream, less hesitation, or easier urination within the first week or two. Full benefit may take several weeks.

5-Alpha Reductase Inhibitors for Larger Prostates

5-alpha reductase inhibitors are mainly used for men with larger prostates. They work slowly because they reduce prostate size over time.

How Finasteride and Dutasteride Shrink Prostate Tissue

Finasteride and dutasteride are the two main 5-alpha reductase inhibitors used for BPH.

These medicines block the enzyme that changes testosterone into dihydrotestosterone, or DHT. DHT helps drive prostate growth. When DHT levels fall, the prostate can slowly shrink.

Over time, these medicines may reduce prostate size by about 20% to 25%. For example, a prostate of 80 grams (2.8 ounces) may shrink toward about 60 to 65 grams (2.1 to 2.3 ounces). The exact response varies.

Why These Medicines Take Months to Work

5-alpha reductase inhibitors do not give fast relief. They work by changing prostate tissue over time.

Many men need 3 to 6 months before they notice clear symptom improvement. Maximum benefit may take 6 to 12 months or longer. These medicines are often used for long-term control and to reduce the risk of urinary retention or future BPH surgery in men with larger prostates.

Sexual Side Effects and PSA Changes

Possible side effects include lower sexual desire, erection problems, reduced semen volume, breast tenderness, or breast enlargement. Not every man gets these side effects.

These medicines also lower PSA levels. After about 6 months or more, PSA may fall by about 50%. Doctors take this into account when interpreting PSA results. A high or rising PSA while taking finasteride or dutasteride may still need further assessment.

Tadalafil for Urinary Symptoms and Erections

Tadalafil is a phosphodiesterase-5 inhibitor, also called a PDE-5 inhibitor. It is best known as a medicine for erectile dysfunction, but a low daily dose can also help urinary symptoms from BPH.

How Daily Tadalafil May Help BPH Symptoms

For BPH, tadalafil is usually taken as a low daily dose, often 5 milligrams (mg).

Tadalafil helps relax smooth muscle in the lower urinary tract. This may improve urinary symptoms such as frequency, urgency, weak stream, or incomplete emptying in some men. It does not shrink the prostate.

When Tadalafil May Be Useful for Two Problems

BPH symptoms and erectile dysfunction often occur in the same age group. Daily tadalafil may be useful when a man has both urinary symptoms and erection problems.

It may reduce urinary symptoms while also helping erections. It may not be the best choice for every man, and the effect on urine flow can vary.

Safety Questions Before Using Tadalafil

Tadalafil is not safe with nitrate medicines used for chest pain, such as nitroglycerin tablets, sprays, or patches. Combining tadalafil with nitrates can cause a serious drop in blood pressure.

Doctors also use caution when tadalafil is combined with some alpha blockers or blood pressure medicines. Possible side effects include headache, flushing, indigestion, stuffy nose, back pain, muscle aches, and dizziness.

Bladder Medicines Added to BPH Treatment

Some men with BPH also have bladder storage symptoms, such as urgency, frequency, or night urination. In these cases, bladder medicines may be added.

Antimuscarinic Medicines for Urgency

Antimuscarinic medicines help calm an overactive bladder muscle. They may reduce urgency, frequent urination, and urge leakage.

Common examples include oxybutynin, solifenacin, tolterodine, and fesoterodine. Possible side effects include dry mouth, constipation, blurry vision, and sometimes confusion, especially in older adults or sensitive patients.

Beta-3 Agonists for Overactive Bladder Symptoms

Beta-3 agonists are another type of bladder medicine. They help the bladder relax during filling, so it can hold urine more comfortably.

Examples include mirabegron and vibegron. These medicines usually do not cause dry mouth or constipation like antimuscarinics. Mirabegron can raise blood pressure in some men, so blood pressure may need to be checked.

Checking Emptying Before Bladder Relaxing Medicines

Before adding bladder-relaxing medicines, doctors often check whether the bladder is emptying well. This is usually done with a bladder scan after urination.

If a man already has high leftover urine, such as 200 milliliters (6.8 fluid ounces) or more, bladder-relaxing medicines may need extra caution. In some cases, they can worsen emptying or increase the risk of urinary retention.

Combination Treatment for Enlarged Prostate

Some men need more than one medicine. Combination treatment is used when symptoms come from more than one cause, such as prostate blockage plus bladder urgency.

Using Alpha Blockers With 5-Alpha Reductase Inhibitors

An alpha blocker may be combined with a 5-alpha reductase inhibitor in men with larger prostates and bothersome symptoms.

The alpha blocker can improve urine flow quickly by relaxing muscle. The 5-alpha reductase inhibitor works slowly to shrink the prostate and reduce the risk of BPH progression. This combination may be useful when a large prostate is the main problem.

Treating Both Blockage and Urgency

Some men have both voiding symptoms and storage symptoms. For example, they may have a weak stream and also sudden urgency.

In this case, an alpha blocker may be combined with a bladder medicine, such as an antimuscarinic or beta-3 agonist. The alpha blocker helps open the urine channel. The bladder medicine helps reduce urgency and frequency. Doctors usually check bladder emptying before and during this approach.

Deciding When Medicine Is Not Enough

Medicines do not work for every man. A procedure may be considered if symptoms remain bothersome despite tablets or if complications develop.

Examples include repeated urinary retention, repeated urinary tract infections, bladder stones, ongoing bleeding from the prostate, poor bladder emptying, or kidney problems linked with blockage. In these cases, a minimally invasive treatment, laser procedure, or surgery may be discussed.

Written by Chris Morais, MSc, MPhil, PhD — Making complex health information simple.

Sources & Further Reading

  1. Australian Prescriber. Drugs for benign prostatic hypertrophy. https://australianprescriber.tg.org.au/articles/drugs-for-benign-prostatic-hypertrophy.html
  2. Urology Care Foundation. Urology A-Z: Benign Prostatic Hyperplasia (BPH). Linthicum, MD: American Urological Association; 2025. https://www.urologyhealth.org/urology-a-z/b/benign-prostatic-hyperplasia-(bph)
  3. WebMD. Which Medicines Treat BPH? 2025. https://www.webmd.com/men/prostate-enlargement-bph/enlarged-prostate-types-medication-that-work
  4. Mayo Clinic. Benign prostatic hyperplasia (BPH): Diagnosis & treatment. Rochester, MN: Mayo Foundation for Medical Education and Research; 2025. Available from: https://www.mayoclinic.org/diseases-conditions/benign-prostatic-hyperplasia/diagnosis-treatment/drc-20370093
  5. Your benign prostatic hyperplasia medication: When to consider a change. https://www.health.harvard.edu/blog/your-benign-prostatic-hyperplasia-medication-when-to-consider-a-change-2009031134

Note: External links were verified when published but may change over time, which is beyond our control.

Disclaimer: This educational content does not constitute medical advice. Always consult a qualified physician or urologist for personal health concerns or diagnostic decisions.

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