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Caverject / Viridal are injectable solutions used to treat erectile dysfunction (ED).

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Viridal Duo Generic 40mcg
2 Syringes
Our price: $97.00
Caverject Dual Chamber Brand 20mcg
2 Syringes
Our price: $94.00
Caverject Brand 20mcg
1 Vial
Our price: $64.00
Caverject Dual Chamber Brand 10mcg
2 Syringes
Our price: $61.00

*Please note all prices are in US dollars
Caverject / Viridal (alprostadil) is a self-administered injectable medication that can be used to treat erectile dysfunction (ED). Insufficient blood flow into the chambers of the penis is the most common cause of erectile dysfunction, creating the inability of a man to achieve or maintain an erection sufficient for sexual intercourse through to orgasm. Alprostadil is a synthetic form of prostaglandin PGE1 that normally relaxes the muscles and blood vessels in the penis, which increases blood flow and facilitates an erection.


Caverject and Viridal are supplied as individual vials containing the alprostadil powder, together with separate syringes, containers of the diluent, and needles. Caverject Dual Chamber and Viridal Duo come as a pre-loaded disposable combination designed to deliver a single dose without any need for pre-mixing.
Instructions for how to properly inject with Caverject / Viridal should be given by trained healthcare personnel. Carefully follow the guidelines printed on the Product Leaflet that comes with the product. Doctors generally advise not to use alprostadil more than once each day, nor two days in a row, and not more than three times per week. Read more about the fundamentals of erectile dysfunction here.

This text is for informational purposes only. Please consult with a doctor or pharmacist before using any medication. Read the manufacturer’s Product Information leaflet that comes with the medication.

Important: If an erection persists for longer than 4 hours, contact a doctor or call 911 at once. Otherwise, go to a hospital emergency room immediately. Treatment for this condition, known as priapism, should be given within six hours, otherwise it can result in irreversible damage to the penis.

Some of the common side effects of alprostadil are:

  • The penis can become bruised, scarred, or bent, especially after long-term use of alprostadil
  • The skin on the penis may swell, discolor or bruise, become irritated, inflamed, or swollen, itch, bleed, or feel numb, warm, tender, or painful at the site of injection.
  • Muscle spasms
  • The testes or scrotum can become red, swollen, or painful or develop lumps called spermatoceles.
  • Erections can be uncomfortable and painful, and ejaculation may change
  • The foreskin and head of the penis can feel tight or swollen
  • Urination can change, either passing more urgently and frequently than normal or with pain or difficulty
  • Blood can be seen in the urine or at the end of the penis, which could be because the medicine was accidentally injected directly into the urethra
  • Pelvic pain, weakness, sweating, nausea, swollen arms or legs, common cold, dry mouth, yeast infection.


Not all side effects are listed here. If these or other unlisted symptoms persist or worsen, consult with a healthcare provider or pharmacist.

Caverject / Viridal can help men with erectile dysfunction achieve a sustainable erection and engage in normal sexual activity. Erectile dysfunction is diagnosed as the inability to achieve and maintain an erection firm enough for satisfactory sexual intercourse. It can be both a short-term and a long-term problem. The primary symptoms include difficulty getting an erection and sustaining the erection right through sexual activity.

  • How long does it take alprostadil to work?
    Caverject / Viridal should start to work within five to ten minutes after injection. It should be possible to commense sex ten minutes to twenty minutes afterwards. Erections can continue even after orgasm and ejaculation.
  • How effective are alprostadil injections?
    Caverject / Viridal has been found to produce a firm enough erection to support sex through to orgasm in roughly 80 percent of men with erectile dysfuntion.
  • Are ED injections better than pills?
    The effectiveness of either pills or injectables varies from patient to patient. Some men can't use oral medication to correct erection dysfunction either because of other medical problems or due to side effects. As well, oral medications such as Viagra or Cialis only work if a man does have some remaining erectile function and only has problems achieving and sustaining a full erection. Injecting alprostadil directly into the penis can work better in such cases, but it is usually only considered after pills have been tried.
  • Can you use alprostadil and Cialis together?
    Not more than one type of treatment of erectile dysfunction should be taken at the same time. The choice is either Cialis or alprostadil. Cialis (tadalafil) is a form of oral medication to treat erectile dysfunction.
  • Do you stay hard after orgasm with caverject?
    Normally, an erection due to Caverject should not last more than an hour and it often subsides after orgasm. If an erection lasts longer than two hours, refer to the information about side effects on the product leaflet. If an erection lasts for longer than four hours (priapism), it requires immediate medical attention.

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