Caverject, illustration of injection vial form (not a photo of the actual pack)

Illustrative image.

Caverject

alprostadil

Prescription required

$55.00

20mcg · 1 syringes

Generic

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20mcg

About Caverject

Overview

Caverject contains alprostadil, a synthetic form of a naturally occurring substance called prostaglandin E1. It is used to treat erectile dysfunction and may also be used alongside other tests to help diagnose it. It works by relaxing smooth muscle and widening blood vessels in the penis, allowing blood to enter and be held there to produce an erection.

What it treats

- Treatment of erectile dysfunction. - Use alongside other diagnostic tests to help diagnose erectile dysfunction.

Safety information

Side effects

Penile pain is the most common side effect, affecting at least 10% of patients. Seek immediate medical assistance if an erection lasts longer than 4 hours. Prolonged erections and priapism can occur. Contact your doctor if you develop penile scarring or a change in the angle or shape of the penis. Regular checks are needed to detect scarring. Other risks include low blood pressure and bleeding at the injection site, particularly if you take blood thinners such as warfarin or heparin. If injection-site bleeding occurs, press on the site with an alcohol swab or sterile gauze for 5 minutes. Needle breakage has also been reported. Careful instruction in handling and injection technique may reduce this risk.

When to call your doctor

• Seek medical help immediately if an erection lasts longer than 4 hours.

If symptoms are severe or getting worse quickly, seek emergency care rather than waiting.

Before taking this medicine

Do not use Caverject if you are allergic to alprostadil, have a penile implant, or have a condition that increases the risk of priapism (a prolonged erection), such as sickle cell anemia, sickle cell trait, multiple myeloma or leukemia. It must not be used to treat erectile dysfunction in men with penile deformity, abnormal curvature, scarring within the penis or Peyronie’s disease. Avoid use if you have known venous leakage in the penis, as Caverject can cause low blood pressure. Blood thinners such as warfarin or heparin increase the risk of bleeding at the injection site. If bleeding occurs, press the site with an alcohol swab or sterile gauze for 5 minutes. Underlying treatable causes of erectile dysfunction should be assessed and treated before starting therapy, including consideration of cardiovascular risks related to existing medical conditions. Combining Caverject with other medicines injected into the penis that affect blood vessels is not recommended. Regular follow-up is needed to check for penile scarring. Treatment must be stopped if abnormal curvature or scarring within the erectile tissue develops. Seek immediate medical help for an erection lasting longer than 4 hours. Proper handling and injection training are important because needle breakage has been reported. Caverject is not indicated for newborns or infants; its benzyl alcohol preservative can cause serious or fatal reactions in newborns and low-birth-weight infants. Patients should also receive advice on protection against sexually transmitted infections, including HIV.

Interactions

Interactions between alprostadil and other medicines taken by mouth or injected into the penis have not been formally studied. Tell your doctor if you use medicines by either route.

Using Caverject

Dosing

Dosing is set by your prescriber. Each health care professional may prescribe medication differently according to a patient's medical history and condition, so follow the directions on your prescription label and speak to your doctor or pharmacist before changing anything.

Storage

Store in the original carton below 25°C, protected from light, unless the pack states refrigeration. Do not freeze. Keep all medicines out of the sight and reach of children.

Clinical information on this page is summarised from the US FDA label CAVERJECT (ALPROSTADIL) INJECTION, POWDER, LYOPHILIZED, FOR SOLUTION [PHARMACIA & UPJOHN COMPANY LLC] (DailyMed, retrieved 19 September 2026).

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