Rezum Side Effects and Sexual Function – Does Steam Prostate Treatment Cause Retrograde Ejaculation?

Fear of permanent sexual dysfunction—specifically erectile dysfunction (ED) and dry orgasm (retrograde ejaculation)—is the primary reason millions of men delay BPH surgery or discontinue oral prostate medications. When searching Google for Rezum side effects and sexual function, patients want transparent, peer-reviewed clinical proof regarding how convective water vapor thermal therapy protects the delicate neurovascular and sphincteric anatomy responsible for male sexual health [1, 2].

💡 Quick Clinical Summary:
Pivotal 5-year clinical trial data (Rezūm II Study, McVary et al.) demonstrate that Rezum side effects and sexual function outcomes are highly favorable: adverse events are predominantly mild, transient lower urinary tract irritative symptoms during the first 2–4 weeks (dysuria 16.9%, transient hematuria 12.5%, hematospermia 7.4%, urgency 5.9%), with 0% de novo device-related erectile dysfunction through 5 years [1]. Because convective steam stays strictly within the prostatic transition zone and spares both the periprostatic neurovascular bundles and the internal bladder neck sphincter, antegrade ejaculation is preserved in 95%–97% of men—compared to a 65%–75% retrograde ejaculation rate after conventional TURP [1, 3].

Figure 1: By confining convective water vapor within the transition zone capsule and sparing the bladder neck internal sphincter, Rezum preserves natural forward ejaculation and erectile nerve function (Source: NCI / Wikimedia Commons).

1. Neuroanatomical Preservation – Why Rezum Protects Erections and Antegrade Ejaculation

Preserving sexual function requires protecting two distinct anatomical structures: the cavernosal nerves and the bladder neck sphincter.

To understand why conventional BPH surgeries and oral medications impair sexual function while Rezum preserves it, we must examine two physiological mechanisms:

• Protection of the Cavernosal Neurovascular Bundles (Erectile Function): The nerves and arteries that govern penile erection run along the posterolateral surface of the prostate outside the surgical capsule (neurovascular bundles of Walsh). Conductive heat or deep monopolar electrical current can penetrate across the capsule and cause thermal nerve injury. In contrast, Rezum uses convective water vapor that releases thermal energy only within the transition zone compartments and is physically blocked by the dense fibrous surgical capsule, resulting in 0% de novo erectile dysfunction across 5 years of follow-up [1, 3].
• Preservation of the Internal Urethral Sphincter & Verumontanum (Ejaculatory Function): Normal forward (antegrade) ejaculation requires the internal sphincter at the bladder neck to contract tightly during emission while the ejaculatory ducts at the verumontanum propel semen forward. Traditional TURP and HoLEP resect the bladder neck fibers, causing semen to take the path of least resistance backward into the bladder (retrograde ejaculation in 65%–80% of cases) [2]. During Rezum, Dr. Dang Phuoc Dat places needle deployments at least 1 cm distal to the bladder neck and proximal to the verumontanum, keeping the bladder neck closure mechanism intact in over 95% of patients [1, 3].

2. Clinical Incidence of Rezum Side Effects vs Oral BPH Medications and TURP

In comparative studies evaluating the Rezūm II trial cohort against the MTOPS medical therapy trial (alpha-blockers, 5-alpha reductase inhibitors, and combination therapy), Rezum demonstrated superior sexual outcomes alongside mild, self-limiting local side effects [1, 3]:

Figure 2: By replacing lifelong alpha-blockers and 5-ARIs with a single water vapor procedure, Rezum eliminates medication-induced sexual dysfunction [3].

3. Reversing Medication-Induced Sexual Side Effects by Switching to Rezum

Many men believe their declining sexual function is simply aging, when it is actually caused by their daily BPH pills.

In clinical practice at Family Hospital Da Nang, Dr. Dang Phuoc Dat frequently evaluates men in their 50s and 60s who experience anejaculation (dry climax) caused by selective alpha-1A blockers (such as Tamsulosin or Silodosin) or erectile stiffness loss caused by 5-alpha reductase inhibitors (Finasteride or Dutasteride) [3]. By undergoing a single 10-minute Rezum procedure and discontinuing oral BPH medications 3 to 4 weeks later, patients eliminate pharmacologic suppression of dihydrotestosterone (DHT) and alpha-adrenergic smooth muscle tone, often experiencing a natural recovery of ejaculatory volume and libido [1, 3].

4. Frequently Asked Questions (FAQ)

Question 1: Can Rezum cause urinary incontinence (leaking urine)?

No. Permanent stress urinary incontinence is virtually non-existent with Rezum because all water vapor injections are delivered under direct high-definition endoscopic visualization strictly proximal to the verumontanum, completely avoiding the external striated urethral sphincter [1, 2].

Question 2: How long do the temporary urinary side effects of Rezum last?

Mild burning during urination (dysuria), pink urine, and increased urinary urgency typically peak during the first 7 to 14 days after catheter removal and resolve completely by Week 3 to Week 4 as the urethral lining heals [1, 2].

Question 3: Does treating an enlarged median lobe with Rezum increase the risk of retrograde ejaculation?

Even when 1 to 2 steam injections are delivered directly into an obstructive median lobe, the internal bladder neck sphincter fibers remain structurally intact, preserving antegrade ejaculation in 93% to 95% of patients [1].

5. References (Vancouver Style)

1. McVary KT, Gittelman MC, Goldberg KA, Patel K, Shore ND, Levin RM, et al. Final 5-Year Outcomes of the Multicenter Randomized Sham-Controlled Trial of a Water Vapor Thermal Therapy for Treatment of Moderate to Severe Lower Urinary Tract Symptoms Secondary to Benign Prostatic Hyperplasia. J Urol. 2021;206(3):715-24.
2. Sandhu JS, Bixler BR, Dahm P, Goueli R, Kirkby E, Stoffel JT, et al. Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia (BPH): AUA Guideline Amendment 2023. J Urol. 2024;211(1):11-9.
3. McVary KT, Rogers T, Mahon J, Gupta NK. Is Sexual Function Better Preserved After Water Vapor Thermal Therapy or Medical Therapy for Lower Urinary Tract Symptoms Due to Benign Prostatic Hyperplasia? J Sex Med. 2018;15(12):1728-38.
4. Gravas S, Gacci M, Gratzke C, Herrmann TRW, Karavitakis M, Kyriazis I, et al. EAU Guidelines on Management of Non-Neurogenic Male Lower Urinary Tract Symptoms (LUTS). Arnhem: European Association of Urology; 2025-2026.

Medical Disclaimer: This clinical article is authored and medically reviewed by Dr. Dang Phuoc Dat, MD, Specialist Level I (Bs CKI Đặng Phước Đạt) based on current international urological guidelines for educational purposes. It does not substitute for an in-person clinical examination, diagnostic imaging, and individualized treatment plan from a qualified urologist.