Edex Injection

Name: Edex Injection

edex® (alprostadil for injection)

For Intracavernous Use Only

Sterile Powder and Diluent
(sterile 0.9% sodium chloride) in Cartridges

Rx Only

Indications and Usage for Edex Injection

edex® is indicated for the treatment of erectile dysfunction due to neurogenic, vasculogenic, psychogenic, or mixed etiology.


edex®should not be used:

  • in men who have conditions that predispose them to priapism, such as sickle cell anemia or sickle cell trait, multiple myeloma, or leukemia [see Warnings].
  • for the treatment of ED in men with fibrotic conditions of the penis, such as cavernosal fibrosis or Peyronie’s disease [see Precautions] 
  • in men with penile implants



1) Intracavernous injections of edex® can lead to increased peripheral blood levels of PGE1 and its metabolites, especially in those patients with significant corpora cavernosa venous leakage. Increased peripheral blood levels of PGE1 and its metabolites may lead to hypotension and/or dizziness.

2) Regular follow-up of patients, with careful examination of the penis at the start of therapy and at regular intervals (e.g. 3 months), is strongly recommended to identify any penile changes. The overall incidence of penile fibrosis, including Peyronie's disease, reported in clinical studies up to 24 months with edex® was 7.8%. Treatment with edex® should be discontinued in patients who develop penile angulation, cavernosal fibrosis, or Peyronie's disease. Treatment can be resumed if the penile abnormality subsides.

3) The safety and efficacy of combinations of edex® and other vasoactive agents have not been systematically studied. Therefore, the use of such combinations is not recommended.

4) After injection of the edex® solution, compression of the injection site for five minutes, or until bleeding stops, is necessary. Patients on anticoagulants, such as warfarin or heparin, may have increased propensity for bleeding after intracavernous injection.

5) Underlying treatable medical causes of erectile dysfunction should be diagnosed and treated prior to initiation of therapy with edex®.

6) edex® uses a superfine (29 gauge) needle. As with all superfine needles, the possibility of needle breakage exists. Careful instruction in proper patient handling and injection techniques may minimize the potential for needle breakage.

7) The patient should be instructed not to reuse or to share needles or cartridges. As with all prescription medicines, the patient should not allow anyone else to use his medicine.

8)Cardiovascular Risk Related to Underlying Medical Conditions

There is a potential for cardiac risk of sexual activity in patients with preexisting cardiovascular disease. Therefore, treatments for erectile dysfunction, including edex®, generally should not be used in men for whom sexual activity is inadvisable because of their underlying cardiovascular status.  In addition, the evaluation of erectile dysfunction should include a determination of potential underlying causes and the identification of appropriate treatment following a complete medical assessment.

Drug Interactions

The pharmacodynamic interaction between heparin (5,000 IU) and alprostadil intravenous infusion (90 mcg over 3 hours) was investigated. The results indicate significant changes in partial thromboplastin time (140% increase) and thrombin time (120% increase). Therefore, caution should be exercised with concomitant administration of heparin and edex®.

(Also, see drug-drug interaction studies in CLINICAL PHARMACOLOGY, Pharmacokinetics subsection.)

Information for Patients

To ensure safe and effective use of edex®, the patient should be thoroughly instructed and trained in the self-injection technique before he begins intracavernous treatment with edex® at home. The desirable dose should be established in the physician's office. The instructions for preparation of the edex® solution should be carefully followed. The reconstituted solution may initially appear cloudy due to small air bubbles. Do not use the solution if it remains cloudy, contains precipitates, or is discolored. The reconstituted solution should be gently mixed, not shaken. A patient information pamphlet is included in each package of edex® cartridges.

edex® should be used immediately after reconstitution. The patient should follow the instructions in the patient information pamphlet to limit the possibility of bacterial contamination. The reconstituted cartridge is designed for one use only and should be discarded after use. The edex® cartridge contains a solid layer or Iyophilized cake of dry white powder approximately 3/8" in thickness. A normal cake may appear cracked or crumbled. If the cartridge is damaged, the cake may shrink in size. Do not use the cartridge if it appears damaged or the cake is substantially reduced in size.

If the dosage prescribed is less than 1 mL of edex® solution, excess solution will be expelled through the needle as the plunger is pushed and the upper rim of the top stopper reaches the correct volume mark for the prescribed dose. The needle must be properly discarded after use; it must not be reused or shared with other persons.

The dose of edex® that is established in the physician's office should not be changed by the patient without consulting the physician. The patient may expect an erection to occur within 5 to 20 minutes. A standard treatment goal is to produce an erection lasting no longer than 1 hour. edex® should be used no more than 3 times per week, with at least 24 hours between each use.

Patients should be aware of possible side effects of therapy with edex®; the most frequently occurring is penile pain during and/or after injection, usually mild to moderate in severity. A potentially serious adverse reaction with intracavernous therapy is priapism. Accordingly, the patient should be instructed to contact the physician's office immediately or, if unavailable, to seek immediate medical assistance if an erection persists for longer than 6 hours.

The patient should report any penile pain that was not present before or that increased in intensity, as well as the occurrence of nodules or hard tissue in the penis to his physician as soon as possible. As with any injection, infection is possible. Patients should be instructed to report to the physician any penile redness, swelling, tenderness or curvature of the erect penis. The patient must visit the physician's office for regular checkups for assessment of the therapeutic benefit and safety of treatment with edex®.

Note: Individuals who are sexually active should be counseled about the protective measures that are necessary to guard against the spread of sexually transmitted diseases, including the human immunodeficiency virus (HIV). Use of intracavernous edex® offers no protection from the transmission of sexually transmitted or blood-borne diseases. The injection of edex® can induce a small amount of bleeding at the site of injection. In patients infected with blood-borne diseases, this could increase the risk of transmission of blood-borne diseases between partners.

Carcinogenesis, Mutagenesis, Impairment of Fertility

Long-term carcinogenicity studies have not been conducted. Alprostadil showed no evidence of mutagenicity in three in vitro assays including the AMES bacterial reverse mutation assay, a forward gene mutation assay in Chinese hamster lung (V79) cells, and a chromosome aberration assay in human peripheral lymphocytes. Alprostadil did not produce damage to chromosomes or the mitotic apparatus in the in vivo rat micronucleus test.

Alprostadil did not cause any adverse effects on fertility or general reproductive performance when administered intraperitoneally to male or female rats at dose levels from 2 to 200 mcg/kg/day. The high dose of 200 mcg/kg/day is about 300 times the maximum recommended human dose (MRHD) on a body weight basis. The human dose of edex® is <1 mcg/kg (MRHD is 40 mcg and the calculation assumes a 60 kg subject).

Pregnancy, Nursing Mothers and Pediatric Use

edex® is not indicated for use in women or pediatric patients.

Geriatric Use

Of the approximately 1,065 patients who entered the in-office dose-titration period in clinical studies, 25% were 65 years or older. In clinical studies, geriatric patients required, on average, higher minimally effective doses and had a higher rate of lack of effect (optimum dose not determined). Overall differences in safety were not observed between these geriatric patients and younger patients. Geriatric patients should be dosed and titrated according to the same DOSAGE AND ADMINISTRATION recommendations as younger patients, and the lowest possible effective dose should always be used.

This drug is known to be substantially excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.


Limited data are available in regard to edex® overdose in humans. Systemic reactions are uncommon with intracavernous injection of edex®. Hypotension occurred in less than 1% of patients treated with edex®. A single dose rising tolerance study in healthy volunteers indicated that single intravenous doses of alprostadil from 1 to 120 mcg were well tolerated. Beginning with a 40 mcg bolus intravenous dose, the frequency of drug-related systemic adverse events increased in a dose-dependent manner, characterized mainly by facial flushing.

The primary symptom of an edex® overdose is a prolonged erection or priapism. Because of the potential for tissue hypoxia and possible necrosis, it is strongly recommended to treat an erection lasting more than 6 hours. The patient is strongly encouraged to go to the nearest emergency room if his personal physician is not available.

In the event of an overdose, supportive therapy according to the presence of other symptoms is recommended.

Principal Display Panel - 20 mcg

edex® 20 mcg NDC 52244-120-01
(alprostadil for injection)

sterile powder and diluent (sterile 0.9% sodium chloride injection) in cartridge for intracavernous injection

Rx only

NDC 52244-020-06

Rx only

edex® 20 mcg
(alprostadil for injection)

cartridge 6 pack

sterile powder and diluent (sterile 0.9% sodium chloride) in cartridges for intracavernous injection

contains edex® injection device and supplies for 6 single-doses