Comparison

Vacuum Device vs Injections: Choosing Your Second-Line Treatment

Both work when tablets have failed, and both work through mechanisms that do not care whether your nerves or arteries are damaged. The choice comes down to a needle against a pump.

By EDTG editorialUpdated 18 NOV 20253 min read

Key takeaways

Both bypass the mechanisms that tablets depend on, so failure of tablets predicts nothing about either.
The vacuum device produces an erection in around 90% of men — but long-term continuation is often under half.
Injections produce a more natural erection and better satisfaction, at the cost of a needle and a clinic titration visit.
The vacuum device is the safer option in men on anticoagulants or with a priapism risk.
Injection therapy needs a supervised first dose. Never start it at home.

Side by side

Attribute	Vacuum erection device	Injection therapy
Can produce a usable erection	About 90%	70–90%+
Erection quality	Adequate; pivots at the base	Close to natural rigidity
Feels natural	No — cool, mechanical	Largely yes
Prescription needed	No	Yes
Cost	$100–$500 one-off	$30–$80 per multi-dose vial
Time to use	2–5 minutes of pumping	Under a minute once trained
Main drawback	Interrupts sex; unromantic	It is a needle
Long-term continuation	Often under 50%	Better, but dropout occurs
Serious risk	Very low	Priapism, fibrosis over years

The verdict

If you can face a needle, injections give a better erection and a better experience — and most men who try them find the needle far less of an ordeal than they expected. Choose the vacuum device if needles are an absolute barrier, if you take anticoagulants and injections are complicated, if cost over years matters most, or if you want something with essentially no medical risk. There is also a legitimate third answer: try the device first because it needs no prescription and no clinic visit, then move to injections if the experience is the problem rather than the effectiveness.

Effectiveness is not the same as satisfaction

This is the crux. On raw effectiveness — can it produce an erection firm enough for penetration — the vacuum device is excellent, around 90%. On whether men keep using it a year later, it performs considerably worse, frequently under half.

The reasons are consistent and none of them are about failure: the interruption to sex, the mechanical feel, the coolness of the penis, and the fact that the erection pivots at the base because the part behind the ring is not rigid. Injections do not have those problems, which is why satisfaction and continuation are both higher.

Who should choose which

Choose the vacuum device if	Choose injections if
Needles are an absolute barrier	You can tolerate a fine needle in the shaft
You take anticoagulants or have a bleeding disorder	You want an erection that feels close to natural
You have sickle cell disease or priapism risk	Tablets failed after prostate surgery
You want no prescription and no clinic visit	You want spontaneity once you are trained
You want a single purchase rather than ongoing cost	Your partner finds the pump off-putting
You are doing penile rehabilitation after surgery	You have already tried a device and disliked it

They are not mutually exclusive

Under specialist guidance, some men use both — a vacuum device for tissue health and routine use, injections for occasions where a better erection matters. Others combine a vacuum device with a PDE5 inhibitor, or injections with a constriction ring where venous leak is also present.

FAQ

Frequently asked questions

Which works better, a pump or injections?

Injections generally produce a more natural, more rigid erection and higher satisfaction. A vacuum device produces a usable erection in around 90% of men but with a mechanical feel that many find hard to live with long term.

Do injections hurt?

The needle is very fine and most men report a pinch. A dull ache during the erection is more common and usually relates to the alprostadil component, which can often be adjusted.

Can I try a vacuum device without seeing a doctor?

Yes, they are available without a prescription — but choose a medical-grade device with a vacuum limiter, and discuss it first if you take anticoagulants or have a bleeding disorder.

Can I use both?

Some men do, under specialist guidance. Do not combine treatments on your own, as it increases the risk of a prolonged erection.

Sources

What this is based on

We link to primary sources — clinical guidelines, regulator publications and peer-reviewed research — wherever possible. Links open on third-party sites we do not control.

[01]American Urological Association. Erectile Dysfunction: AUA Guideline (2018).
[02]National Institute of Diabetes and Digestive and Kidney Diseases. Treatment for Erectile Dysfunction.
[03]Urology Care Foundation. What is Erectile Dysfunction?.

Not medical advice:This article is general information. Talk to a licensed clinician about your own situation. Full disclaimer.

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