Trimix Injection Cost: What Trimix Is and Who Sells It Online

Below: what trimix is, what the approved injection labels warn about, every trimix price we can read, and when a prescriber turns to injections. We give no doses and no injection steps. Only a clinician who examines you should teach either.

What is trimix?

Trimix is a shot into the penis that brings on an erection directly. Doctors call this an intracavernosal injection, which simply means into the spongy tissue of the penis. It works on the penis directly, so it can help men for whom pills do not work.

The three drugs each relax blood vessels in a different way:

• Alprostadil is a man-made form of a natural body chemical that widens blood vessels. It is the only one of the three sold as an FDA-approved ED injection on its own.
• Papaverine relaxes smooth muscle, including the muscle in blood vessel walls.
• Phentolamine blocks a signal that keeps blood vessels narrow.

Because each drug adds a little, a pharmacy can mix smaller amounts of each than one drug alone would need. That is the idea behind the mix. The exact recipe varies by prescriber and pharmacy.

Why trimix is not FDA-approved

Trimix is made to order by a compounding pharmacy. The FDA says "Compounded drugs are not FDA-approved. This means that FDA does not verify the safety, effectiveness or quality of compounded drugs before they are marketed" (FDA: compounding questions and answers, read 14 November 2026).

The FDA-approved ED injections contain alprostadil alone. Caverject's label says "CAVERJECT is indicated for the treatment of erectile dysfunction" (DailyMed: Caverject label, read 14 November 2026). Edex's label says "edex ® is indicated for the treatment of erectile dysfunction due to neurogenic, vasculogenic, psychogenic, or mixed etiology" (DailyMed: Edex label, read 14 November 2026). In plain words, ED from nerve, blood vessel or mental causes, or a mix.

So a man who wants an FDA-reviewed injection would ask about Caverject or Edex. A man prescribed trimix gets a compounded mix with no FDA review of the finished product.

What the alprostadil labels warn about

No trimix label exists, so the approved alprostadil labels are the closest guide to the risks. Trimix adds two more drugs, so treat these as a starting point to discuss with your prescriber.

• An erection that will not go down. Caverject's label says "Prolonged erection and priapism have occurred in patients receiving CAVERJECT" (Caverject label). Priapism means an erection that lasts for hours and can damage the penis. Edex's label reports that "Prolonged erections greater than four hours in duration occurred in 4% of all patients treated up to 24 months" (Edex label). An erection past four hours is an emergency.
• Pain. Caverject's label says "The most common (≥10%) adverse reaction is penile pain."
• Who must not use it. The Caverject label rules out "Men who have conditions that predispose them to priapism, such as sickle cell anemia or sickle cell trait, multiple myeloma, or leukemia". It also rules out men with a bent or scarred penis, such as Peyronie's disease, and "Men with penile implants" (Caverject label).

These are why injections start with an in-person or video lesson, and a first test dose under a clinician's watch. Online programs that sell trimix describe their own process on their pages. Ask how they handle the first dose before you order.

Trimix price: who sells ED injections online

Few of the programs we track sell ED injections. These are the two with a published price.

RxSpan MD's product list adds that "RXspan MD does not manufacture compounded medications", which means a partner pharmacy mixes the product (RxSpan MD product list). Neither program says how many injections the monthly price covers. Ask before you pay, since that sets your real cost per use.

Local clinics and urologists also prescribe trimix, filled by a local compounding pharmacy. Their prices are not published in a way we can read and date, so we do not list them. The approved alprostadil injections, Caverject and Edex, are sold at retail pharmacies with a prescription. Insurance may treat them differently from a compounded mix.

Trimix vs ED pills: cost and fit

ED pills are the usual first step. They are cheaper and easier. Generic sildenafil and tadalafil cost a few dollars or less a dose online:

Prices checked November 14, 2026. Injections usually come later, for men whose pills did not work or who cannot take them. Some men cannot take ED pills because they use nitrates for chest pain. That choice belongs with a urologist or prescriber who knows your heart health. Our ED pills compared guide explains the pill options first.

How we rank programs

Payment never moves a rank. Ro is our top-scored ED program today, on price, openness, care, access and reputation. See every score on our best ED programs page.