Treatment Options · 5 min read
Low-Intensity Shockwave Therapy (LiSWT)
The newest and most talked-about option — and the one where honesty about the evidence matters most. Here's what shockwave can and can't do.
What Is LiSWT?
Low-intensity shockwave therapy is a non-invasive, in-office treatment that delivers gentle acoustic (sound) waves to the penis through a probe, with no needles, no surgery, and minimal discomfort. The hope is that, unlike pills or injections that treat a single episode, shockwave might actually improve the underlying blood supply.
The low-energy waves are thought to cause tiny, controlled micro-stresses in the tissue that trigger the body to grow new small blood vessels (neovascularization) and possibly recruit repair cells. In theory this addresses the root vascular problem rather than masking it — which is why it's described as a 'restorative' therapy. Treatment is typically a series of short sessions over several weeks.
How It Works
Mechanism of Action
Acoustic Wave Delivery
Low-intensity shockwaves are delivered to penile tissue via a handheld probe. The waves are acoustic — not electrical — and are applied in a series of pulses across multiple treatment zones.
Neovascularization
The mechanical stress of the shockwaves triggers the release of angiogenic growth factors, stimulating the formation of new blood vessels in the treated tissue.
Improved Blood Flow
New microvasculature increases oxygenated blood delivery to the erectile chambers, addressing the root vascular cause of ED rather than just compensating for it.
Restorative — Not Symptomatic
Unlike pills or injections that work episode-by-episode, the goal of shockwave is to improve baseline function over time as new vessels mature — typically over 1–3 months after completing the course.
What to Expect During Treatment
A typical LiSWT protocol consists of 6–12 treatment sessions, each lasting approximately 15–20 minutes. Sessions are usually scheduled twice weekly for 3–6 weeks. The treatment is performed in the office with no anesthesia required.
A handheld probe is applied to multiple zones along the penile shaft. Patients typically describe a mild tingling or tapping sensation. There is no downtime — men can resume normal activities immediately after each session.
Improvements are typically gradual, developing over 1–3 months after completing the treatment course as new blood vessels mature. Some men experience a reduction in their required PDE5 inhibitor dose; others achieve sufficient improvement to discontinue medication entirely.
What the Evidence Actually Shows
Multiple studies and meta-analyses suggest LiSWT can modestly improve erectile function in some men — particularly those with milder, blood-vessel-related (vasculogenic) ED — and it has a strong safety record. But the trials vary widely in technique, energy, and number of sessions; there's no agreed-upon standard protocol; benefits may fade over time; and the highest-quality reviews are cautious about how durable and meaningful the improvements are.
The 2025 Cochrane systematic review — the most rigorous summary available, pooling 21 trials and over 1,300 men — concluded that shockwave may produce a small short-term improvement in erectile function (about 4 points on a standard scale), but that the certainty of the evidence is low and the benefit may not be clinically important for everyone. Professional bodies treat LiSWT as promising but investigational: the Sexual Medicine Society of North America classes it among restorative therapies still under study and best offered in a research or carefully-counseled setting.
What the Better Individual Trials Found
The most rigorous single studies are encouraging. In the first double-blind, sham-controlled trial done only in men with moderate ED, about 8 in 10 men who got real shockwave reached a meaningful improvement in erectile-function scores at three months, while none of the men who got the (identical-feeling) sham treatment did.
A separate sham-controlled trial found that just over half of men met a meaningful improvement at six months, and most men who started with soft erections improved to functional firmness.
The caution still stands: when researchers pool all the trials together — including weaker ones — the average benefit is smaller and the overall certainty is low. The honest summary is that shockwave is a promising option for the right candidate — a man with milder, blood-flow-related ED — and not a guaranteed fix or a rescue therapy for severe ED.
What to Understand Before Paying for Shockwave
- In the United States, LiSWT for ED is not FDA-cleared for that use — it's considered investigational/elective.
- It's usually not covered by insurance and is paid out of pocket; costs add up over a series of sessions.
- Be cautious of clinics promising guaranteed results or 'cures.' Ask what device, protocol, and evidence they're using.
- It's safe and low-risk — the main downside is cost and the chance it doesn't help.
- Early data suggests it's most helpful for men just beginning to need a PDE5 inhibitor, or starting to lose responsiveness to one. It will not restore erections in a man who already cannot achieve one with other treatments.
Who Is a Candidate?
Likely to Benefit
- Mild-to-moderate vasculogenic ED
- Men who respond partially to PDE5 inhibitors but want to improve baseline function
- Men just beginning to need a PDE5 inhibitor, or starting to lose responsiveness to one
- Men who prefer to avoid ongoing medication use
- Post-prostatectomy patients in penile rehabilitation (investigational)
May Not Be Appropriate
- Severe ED — shockwave will not restore erections in a man who cannot achieve one with other treatments
- Men with penile implants already in place
- Active penile infection or skin condition
- Bleeding disorders or anticoagulant therapy (relative contraindication)
Key Takeaways
- Shockwave is a non-invasive, restorative therapy that aims to improve blood supply — promising but still investigational in the U.S.
- Best evidence is in milder, vasculogenic ED; it's not a rescue therapy for severe ED.
- The most rigorous individual trials are encouraging, but pooled evidence is low-certainty.
- It's safe and low-risk; the main downsides are out-of-pocket cost and the chance it doesn't help.
Explore Whether LiSWT Is Right for You
Schedule a consultation to discuss your candidacy and what outcomes are realistic based on your history and degree of vascular involvement.