• Alprostadil

Caverject is a single use erectile dysfunction treatment, designed to be injected into the base of the penis.

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Caverject Vials 5mcg

If you’ve never used Caverject Vials before, your doctor may prescribe the 5 microgram version in order to test its suitability.

Caverject Vials 10mcg

The 10 microgram strength may be issued after the introductory dose has been established as safe.

Caverject Vials 20mcg

In cases where 10 micrograms has proved ineffective, the 20 microgram version may be prescribed to those still experiencing ED symptoms.

Caverject Vials 40mcg

The maximum strength is 40 micrograms, and this will only be issued if the 20 microgram dose has produced a less than sufficient response.

Caverject Dual Chamber 10mcg

The 10 microgram strength is typically issued to those who have not used this treatment before.

Caverject Dual Chamber 20mcg

Caverject Dual Chamber 20 microgram strength may be issued if you have safely used this product before but require a slightly stronger dose.

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Caverject Vials / Dual Chamber

Caverject is an injectable drug, indicated for the treatment of erectile dysfunction. It is available to buy from our online pharmacy in two forms, as Caverject Vials and as Caverject Dual Chamber. Both perform the same function, but are applied in slightly different ways, and provided in different strengths.

  1. Noticeable differences in as little as 5 minutes
  2. Available in two forms
  3. Simple to use injections

When you buy Caverject injection vials you get: a vial containing the active ingredient alprostadil in the form of a powder; a syringe containing the mixing solution; and two types of needles. The larger needle is used to insert the liquid into the vial containing the powder; and once this has dissolved, the smaller needle is used to inject the mixed solution into the base of the penis.

Those who buy Caverject dual chamber will receive injections that do not require assembly. The medicine is activated when the two chambers mixed together.

What is ED?

Impotence is a taboo subject for many men, but that doesn’t make it any less common. Most men will experience erectile dysfunction at some point in their lives. It’s important to keep in mind that ED can be caused by almost anything, such as the presence of conditions like diabetes, or anxiety, or the consumption of alcohol.

It is a common misconception that the condition only hits after a certain age. Granted, the condition is more widespread among older men, due to health and lifestyle factors which tend to run alongside the ageing process, such as raised cholesterol and increased blood pressure. But it is not uncommon for younger men to come into contact with ED. One of the main causes of the condition among men in their 20s and 30 is mental strain. A job may be causing anxiety, or pressure to perform well sexually may be making one feel self-conscious, and obstructing erectile potency.

Biologically, erectile dysfunction is most typically a result of the restriction of blood flow to the penis. This can be a consequence of muscle walls inside blood vessels close to the penis tightening up, and not letting enough blood through.

How does Caverject work?

The active ingredient in Caverject is a medicine called alprostadil, which works in a comparable way to a hormone present in your body called prostaglandin E1 (PGE1). This hormone is responsible for the easing and dilation of blood vessels, which in cases of ED, can become constrictive and hinder erectile performance.

After being injected into the base of the penis, alprostadil encourages these blood vessels to dilate, allowing for easier circulation and increased erectile function. Alprostadil should only cause erections if you are sexually stimulated. Other products, including MUSE, also contain this active ingredient.

Which dose should I use?

You can buy Caverject from our UK online pharmacy in the form of a 5 mcg, 10 mcg, 20 mcg or 40 mcg injection vial; or you can buy Caverject Dual Chamber in either 10 or 20 microgram strength packs. The strength you choose will depend on whether you have tried using the medicine before, and whether it was effective.

To test suitability of the treatment, when you buy Caverject Vials for the first time you might be advised to use the 5 microgram injection, provided you have no pre-existing medical conditions. If the treatment causes no side effects, a doctor may prescribe the same dose when more is required, or a stronger dose if necessary.

In cases of Caverject Dual Chamber, a doctor may typically prescribe the 10 microgram pack for first time users. If you have tried this version before and experienced no side effects, but found that it was less than fully effective, then your doctor might suggest trying the stronger 20 microgram pack.

Stay safe when buying online

Ordering medicines online should always be undertaken with the utmost care. It is important to ensure that the website you are buying from can fulfil your order, and is operating legally.

Some online pharmacies may claim that you can buy Caverject from them as a generic alprostadil injection. However, no licensed generic form of the medication is currently available.

It is also not possible to buy Caverject at the NHS levy rate at present, as it is not available on NHS prescription. Any website offering to provide NHS prescriptions enabling you to buy Caverject should therefore be avoided, as they likely aren't legal.

To protect yourself from fraudulent practices when you buy Caverject or any other erectile dysfunction medicine online, you should only ever use GPhC-registered pharmacies staffed by qualified prescribers.

Men experiencing ED can find secure and confidential assistance online. At, we work with GMC-registered doctors to help ensure your treatment is safe. Take our 5-minute questionnaire to find out if Caverject can help you.

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How to use Caverject

Caverject needs to be administered in a specific way to help reduce the risk of possible side effects. Following the guidelines below and acquainting yourself with the patient information leaflet will help you to get the most out of your treatment.

Caverject Vials:

  1. Prior to using Caverject Vials for the first time, it is important that a qualified doctor or nurse demonstrates how to use it on at least one occasion.
  2. Application instructions can be found in the patient information leaflet. However these should only be used as a reminder. Reading this is not a substitute for physical demonstration from a healthcare professional.
  3. The packet will contain two injections: the larger one is used to mix the medicine; whereas the smaller one is used to administer the medicine.
  4. Once mixed, the contents need to be injected directly into the base of the penis.
  5. Never use more than the amount prescribed for you by your doctor.
  6. Never use this treatment more than once a day or three times a week.
  7. If you are unsure about anything before or during the use of this medicine, speak to your doctor or pharmacist.

Caverject Dual Chamber

  1. Before first use, a doctor or nurse should demonstrate how to use Caverject Dual Chamber.
  2. A step-by-step guide can be found in the patient information leaflet if you need a refresher.
  3. The injection should be prepared before injecting; this can be done up to 24 hours in advance.
  4. Caverject Dual Chamber is administered into the base of the penis.
  5. Never exceed the prescribed dose.
  6. Carefully read the patient information leaflet provided before using this treatment.
  7. If you are unsure about any aspect of this treatment, ask your doctor.

Download Caverject Vials patient information leaflet

Download Caverject Dual Chamber patient information leaflet

Caverject side effects

No medicine is 100 percent risk free when it comes to side effects. Although most men will experience no issues when using Caverject, it is important to be aware of the risks present, so that you can act and get help in the event that side effects do occur. Here is a list of some of the known possible side effects associated with this medicine:

Common (1 in 10 people)
Painful erections.

Uncommon (1 in 100 people):
Swelling or skin discolouration at site of injection, prolonged erections, tender lumps, scarring or misshapen penis (seek medical attention right away if you notice any physical irregularities on or around the penis, or get an erection which won’t go away).

Rare (1 in 1000 people):
Pupil dilation, nausea, dry mouth, irritation of the skin, passing blood with urine, painful urination, feelings of heat in the penis.

The information listed above is not a complete account of the known side effects which this medication may cause. For a more definitive list of side effects, please refer to the patient information leaflet, or speak to your doctor. If you experience any of the above side effects, speak to a medical professional immediately.

Taking it with other medicines

When buying Caverject, you should tell your doctor about any medicines you are taking, whether they are prescription or non-prescription medicines, or remedies. You should not begin or stop taking medication when using this treatment without consulting your prescribing physician first.

Inform your prescriber if you take: antihypertensives, sympathomimetics, high blood pressure medicines, or anticoagulants. Do not take Caverject Vials with any other medications for impotence.

Conditions to look out for

Before using the treatment, let your doctor know if you have, or have had, any of the following: blood-related illnesses, penile implants, any condition which inhibits your ability to perform vigorous exercise, any form of penile problems such as scarring, a deformity or Peyronie’s disease, lung, chest or heart conditions, mental illness, addiction, or stroke.

Again, this is not a comprehensive list of restrictions. In the interests of safety, disclose your full medical history during consultation so that your doctor can make an informed decision about whether this medication is suitable for you to take.

Q&A: our Caverject discussion forum

Can I still drink alcohol?

Technically yes, as there are no known direct interactions between Caverject and alcohol. But drinking alcohol can reduce your ability to get an erection, so we would advise against it when using this treatment.

Will I still be able to drive?

Caverject only works for a short period of time, so should not affect your ability to drive. However, there is a chance that you may experience side effects which might make it dangerous to drive, and in these cases you should refrain from doing so and speak to a doctor right away.

How should I store it?

Keep Caverject in a cool, dry storage environment, below 30 degrees. The medicine should be stored in its original packaging to protect it from sunlight and moisture.

Am I allergic to anything in the medicine?

As well as the active ingredient alprostadil, Caverject also contains lactose, sodium citrate, hydrochloric acid and sodium hydroxide. If you are allergic to any of these ingredients, do not use this treatment.

Is it available over-the-counter?

Caverject can only be bought with a prescription in the UK. This means a doctor will need to write a prescription for you before a pharmacy can legally issue this medication. is a UK based pharmacy with GMC registered doctors who can write you a prescription based on the answers you give using our secure online consultation process.

Is it right for me?

If you think Caverject can help you to overcome ED, fill out our simple questionnaire. A GMC-registered doctor will decide whether or not you are suitable after assessing the answers you give. Once the medication is confirmed as safe for you to use, a prescription will be generated and sent to our dispensing pharmacy on your behalf. Your medication will then be issued and sent to you within the following working day.

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