The verdict for men whose pills have stopped working
If you need erections you can count on now, and your ED is moderate or severe, Trimix is the more dependable choice. It works directly on the erectile tissue, so it often succeeds where pills have failed, including after prostate surgery and in men with diabetes. Shockwave suits a narrower group: men with milder, blood-flow-related ED who want a drug-free option and accept that it is still considered investigational. For a man in between, trying shockwave first with Trimix as a backup, or using Trimix while seeing whether shockwave helps pills work again, can both be sensible plans.
Side by side
| Low-intensity shockwave | Trimix injections | |
|---|---|---|
| What it is | Acoustic pulses applied to the penis over a series of sessions | Compounded mix of papaverine, phentolamine and alprostadil injected into the penis |
| Goal | Improve blood flow and tissue health over time | Produce an erection on demand, within minutes |
| Regulatory status | Not FDA-cleared for ED; AUA calls it investigational | Ingredients are FDA-approved drugs; the compounded mix is not FDA-approved |
| Strongest evidence | Mild to moderate vascular ED | Broad, including diabetes and after prostatectomy |
| Weakest evidence | Severe ED, nerve damage, long-standing ED | Severe venous leak, where the penis cannot hold blood |
| Effect timing | Builds over weeks; not permanent | Each dose, every time |
| Main risks | Minimal reported side effects | Prolonged erection, penile pain, scar tissue |
| Effort | Several clinic visits | Learning to self-inject; refrigerated storage |
How each one works
Shockwave
Low-intensity shockwave delivers gentle acoustic pulses to the shaft and base of the penis. The theory is that the pulses trigger new small blood vessels and tissue repair, improving natural erections over time rather than on demand. Cleveland Clinic describes it as most often used for mild to moderate vascular ED, delivered as a series of short sessions over more than a month, with benefits that tend to last about a year or two. It also notes that ED from nerve damage or psychological causes typically does not respond.
Trimix
Trimix skips the blood-flow repair question entirely. The three drugs relax the smooth muscle in the penis directly, so an erection follows within minutes of the injection, with or without arousal. The American Urological Association’s ED guideline reports that injections have worked in diverse groups of men, including men with diabetes, men with heart risk factors and men after prostate removal, with success rates in studies ranging from 53.7% to 100%. Our Trimix injections page explains the in-clinic test dose and home use.
Where shockwave evidence is weakest
The AUA guideline concludes that sham-controlled trials do not clearly show the benefits reliably outweigh the burdens of time and cost, and that its ability to restore normal erections remains in question. Pooled trials do show gains: a 2017 meta-analysis of seven randomized trials found better erectile function scores with active shockwave than with sham. But the results varied widely between studies.
Severe ED is where the gap shows most. In a 2024 randomized trial in men with severe vascular ED, adding shockwave to daily tadalafil raised erectile function scores more than sham treatment did, yet the share of sexual attempts that ended in successful intercourse did not differ significantly between the groups. For a man who has stopped responding to pills, that is a meaningful limit. Our page on ED pills that are not working covers other reasons pills fail.
Side effects and safety
Shockwave has few reported side effects, which is one of its appeals. Its main costs are time, money and uncertainty.
Trimix carries real but manageable risks. The most serious is priapism, an erection that will not go down. MedlinePlus calls an erection that does not go away a medical emergency that needs an emergency room right away. That is why the first dose is given in the clinic, why your provider sets the dose, and why you leave with a written plan. Penile ache and scar tissue are the other concerns; our page on whether Trimix injections hurt covers what men usually feel. Injections also have a weak spot: in men whose erectile tissue leaks blood back out too quickly, a study of polyagent injections found severe venous leak responded poorly even at higher doses.
If an erection lasts more than 4 hours, call 911 or go to the nearest ER right away. Do not wait to see if it settles.
Convenience and cost
Shockwave requires a series of clinic visits and is not usually covered by insurance, because it is not FDA-cleared for ED. Trimix needs one teaching visit and periodic follow-ups, then you inject at home; the ongoing cost is the medicine. The number of shockwave sessions a man needs is decided after an evaluation, and our answer on how many shockwave sessions are used for ED explains what studies have used. If you are also weighing an FDA-approved injection, see Trimix versus Caverject.
When trying both in sequence makes sense
Sequencing is reasonable when your ED is mild to moderate, mostly blood-flow related, and you are not in a hurry. One approach is shockwave first, then a recheck, with Trimix kept as the next step if erections are still not reliable. Another is Trimix right away for dependable sex, with shockwave added to see whether natural erections or pill response improve. Neither plan makes sense for ED caused mainly by nerve damage, where shockwave has little to work with.
At Ultimate Male, the provider decides with you after reviewing what pills you tried and how, measuring blood pressure, and running same-day labs in San Gabriel or Downey for blood sugar, cholesterol and testosterone. The consultation is an evaluation, not a promise of either treatment. See shockwave therapy and the full erectile dysfunction treatment page for next steps.
