Erectile Dysfunction Devices: How Vacuum Pumps Work and What the Evidence Shows

An erectile dysfunction device, in most searches, means a vacuum erection device (VED), often called a pump. It is a plastic tube that fits over the penis, a pump that pulls air out of the tube, and an elastic ring that is slid onto the base to hold the erection.¹ It needs no drug. In a 2026 meta-analysis of 1,065 men whose ED had resisted pills, the pooled success rate was 0.80, and the most common side effect was bruising.² This page explains how the device is used, what the research found, and how it fits next to other treatments.

It is a companion to our guides to erectile dysfunction treatment and the approved ED medications.

How does a vacuum erection device work?

The pump lowers the air pressure inside the tube. That negative pressure draws blood into the spaces of the penis, which makes it fill and stiffen.⁵ A constriction ring placed at the base then limits how fast blood leaves, so the erection lasts long enough for sex. The NIDDK describes three parts: the tube, the pump and the ring.¹

The device works by blood flow alone, so it does not depend on nerve signals the way pills do. A 2010 review notes that this is why vacuum therapy became a centerpiece of penile rehabilitation after prostate surgery, when nerve damage limits other options.⁵

Some men need practice or adjustment. The NIDDK says the device may take some getting used to, and that it can weaken ejaculation without changing the pleasure of climax.¹

Do vacuum pumps help with ED?

The best recent summary is a 2026 systematic review and meta-analysis of 18 studies covering 1,065 men whose ED did not respond well to PDE5 inhibitors. The pooled effect size for efficacy, defined as successful intercourse or intercourse satisfaction, was 0.80 (95% CI 0.76 to 0.84). By group it was 82.9% in mixed causes, 73.0% in diabetes, 71.8% in spinal cord injury and 84.5% after radical prostatectomy.²

Read that with care. The studies were not all randomized, they used different definitions of success, and the authors say large randomized trials with standardized measures and longer follow-up are still needed. They also report that publication date and age may affect the result.²

A 2026 French systematic review reached a similar overall view: devices improve penile length in men who are candidates for surgery, improve outcomes when combined with PDE5 inhibitors, and may support psychosexual therapy. It adds that long-term adherence is variable.³

What are the side effects and risks?

In the meta-analysis the most common side effect was penile bruising, with a pooled incidence of 24.3%, and 31.4% in men with spinal cord injury.² The NIDDK describes the penis feeling cold or numb and looking purple or bruised, and says bruises are usually painless and clear in a few days.¹

The ring is the part to respect. It holds blood in the penis, so it should not stay on longer than the manufacturer states. Pain, color change or numbness that does not ease after removing the ring is a reason to contact a clinician. The sources we loaded do not give a single time limit that applies to every device, so use the instructions that come with yours and ask a clinician if you take blood thinners or have a bleeding disorder.

How does a pump compare with pills, injections and implants?

An American Family Physician review lists oral PDE5 inhibitors as first-line treatment, with alprostadil and vacuum devices as second-line, and a surgically implanted prosthesis when other treatments fail.⁴ The French review likewise suggests considering a device after a first-line PDE5 inhibitor or local drug treatment.³

A device suits some men who cannot take pills, for example because they use nitrates, and some who prefer not to take a daily or on-demand medicine. It is less convenient than a pill, because it has to be used before sex and takes practice. If you are weighing how to get a prescription for pills at all, our guide on how ED is usually fixed covers the order clinicians follow.

Who should ask a clinician about a pump?

A device may be worth raising when pills have not helped, when they are unsafe because of other medicines, or after prostate surgery. ED can also signal heart or blood-vessel disease, diabetes or low testosterone, which a pump does not address, so the cause is worth finding.⁴

Before buying, ask which style the clinician recommends, how long the ring may stay on, and whether anything in your history (such as a bleeding disorder or blood thinners) makes a device unsuitable. We found no trial that supports the claims some sellers make about permanent size gains or cures, and the reviews above do not either.

What do the pumps and rings sold online add?

Search results for this topic mix patient-education pages with product pages. Product pages describe features such as battery pumps, gauges and ring sizes. None of those features has been tested against one another in the trials we reviewed, so the research supports the device category, not any one brand. Manual and battery pumps are not compared in the studies cited here.

Where a ring or pump is paired with a prescription medicine, the same safety rules apply to the medicine. PDE5 inhibitors must not be taken with nitrates,⁶ and the label lists headache and flushing as the most common side effects.⁶

Your questions

Do vacuum pumps for erectile dysfunction work?

In a 2026 meta-analysis of 18 studies and 1,065 men whose ED had not responded well to pills, the pooled success rate for intercourse or satisfaction was 0.80. The studies were mixed in design and the authors call for larger randomized trials.

Is a vacuum erection device safe?

NIDDK says a device can make the penis feel cold or numb and cause bruising, which is usually painless and fades in a few days. A 2026 systematic review describes the safety profile as favorable. Leaving the ring on too long is the main avoidable risk, so follow the maker's time limit.

Do I need a prescription for a vacuum pump?

Policies differ by product and seller, and we did not find a source that settles it for every device. A urologist or primary care clinician can recommend a device and show how to use it, and can check whether it suits a medical condition such as a bleeding disorder.

Can I use a pump together with ED pills?

Reviews describe combining a vacuum device with a PDE5 inhibitor as an option, and a 2026 systematic review reports better outcomes with the combination. A clinician should confirm the pills are safe for you.

Does a vacuum pump make the penis longer?

A 2026 systematic review found devices improve penile length in men who are candidates for surgery, which is a specific clinical setting. It does not show growth in men without a medical reason.

Read next

Part of our guide: Getting ED Treatment: Doctors, Online Prescriptions and FDA-Approved Options

• Erectile Dysfunction Clinic: What to Expect Online and In Person
• Erectile Dysfunction Treatment: The Options, in the Order Doctors Use Them
• ED Medications List: Pills, Injections, Suppositories and Compounded Options
• Best ED Pills Online: How to Compare the Options