Same-day appointments available.
EN | CH | BM
Book an appointment

Intracavernosal Injection (ICI)

Trouble conceiving is a couple's issue as often as it is a female one. A structured male assessment finds the cause — and many causes are treatable.
DR JOE LEE

On this page

TreatmentIntracavernosal Injection Therapy
Also known asPenile injection therapy, intracavernosal injections (ICI)
Used forErectile dysfunction
How it worksA prescribed medication is injected into the side of the penis to increase blood flow and produce an erection
Treatment settingSelf-administered at home after training by a urologist
DurationAdministered shortly before sexual activity
Suitable forMen with erectile dysfunction who do not respond to or cannot take oral ED medications

What is Intracavernosal Injection Therapy?

Intracavernosal injection therapy is a prescription treatment for erectile dysfunction (ED) that involves injecting medication directly into the erectile tissue of the penis to help achieve an erection suitable for sexual activity.

Unlike oral medications, intracavernosal injections act directly within the penis to increase blood flow and do not rely on the body’s normal erection pathway. The treatment is non-surgical and is typically used only when needed before sexual activity.

Your urologist will prescribe the appropriate medication, determine the correct dose and provide training on how to perform the injections safely and effectively.

Intracavernosal Injection (ICI) Singapore
Intracavernosal injection therapy is a prescription treatment for erectile dysfunction that uses medication injected directly into the penis to help achieve an erection suitable for sexual activity.

How Does Intracavernosal Injection Therapy Work?

A normal erection occurs when sexual stimulation triggers the relaxation of smooth muscle and increased blood flow into the erectile tissue of the penis. Erectile dysfunction develops when this process is disrupted, making it difficult to achieve or maintain sufficient penile rigidity for sexual activity.

Intracavernosal injection therapy works by delivering medication directly into the erectile tissue, allowing blood vessels to relax and increasing blood flow to produce an erection.

  • Medication injection — A small amount of prescribed medication is injected into one side of the penis using a fine needle.
  • Relaxation of blood vessels — The medication relaxes the smooth muscle within the erectile tissue and widens the blood vessels.
  • Increased blood flow — More blood flows into the erectile tissue, allowing the penis to become firm.
  • Development of an erection — An erection usually develops within a short period after the injection and is suitable for sexual activity.
  • Temporary effect — The medication provides a temporary effect and is not considered a permanent treatment or cure for erectile dysfunction.

Watch Dr Joe Lee explain how penile injections (intracavernosal injection therapy) work, who may benefit from this treatment and what patients should know before starting therapy.

@drjollyurology

Quick, effective, and straight to the point. 💉 Watch this video! urology menshealthawareness doctorsoftiktok fyp EDawareness

♬ original sound - Dr Joe Lee | Urology - Dr Joe Lee | Urology
Penile injections work by delivering medication directly into the erectile tissue of the penis, relaxing blood vessels and increasing blood flow to produce an erection.

Who May Benefit from Intracavernosal Injection Therapy?

Intracavernosal injection therapy may be recommended for men with erectile dysfunction who have not achieved satisfactory results with other treatments and require an alternative approach. Suitability depends on the underlying cause of erectile dysfunction, overall health and individual treatment goals.

Your urologist may recommend intracavernosal injection therapy if you have:

  • Persistent erectile dysfunction — Ongoing difficulty achieving or maintaining an erection suitable for sexual activity.
  • Poor response to oral medications — Erectile dysfunction that has not improved sufficiently with oral ED medications.
  • Unsuitability for PDE5 inhibitors — Medical conditions or medications that make oral PDE5 inhibitors inappropriate or ineffective.
  • Erectile dysfunction after prostate surgery — Erectile dysfunction following prostate surgery or certain other pelvic procedures.
  • Preference for a non-surgical treatment — A desire for an effective treatment without undergoing surgery.
  • Need for an alternative treatment — A suitable option when other erectile dysfunction treatments have not provided satisfactory results.

A consultation with a urologist can determine whether intracavernosal injection therapy is appropriate based on your medical history, the cause of your erectile dysfunction, and your individual treatment goals.

What to Expect During Intracavernosal Injection Therapy? 

Intracavernosal injection therapy does not require surgery or hospitalisation. Before beginning treatment, your urologist will assess your condition, prescribe the appropriate medication and teach you the correct injection technique to ensure safe and effective use.

Benefits of Intracavernosal Injection Therapy

Intracavernosal injection therapy is an established treatment for erectile dysfunction and may provide an effective solution for men who do not respond to or cannot take oral ED medications.

Potential benefits include:

  • Highly effective treatment — Can produce erections suitable for sexual activity in many men with erectile dysfunction.
  • Effective when oral medications are unsuccessful — May benefit men who have not achieved satisfactory results with oral ED medications.
  • Non-surgical option — Provides an effective treatment without the need for surgery.
  • On-demand treatment — Used only when needed before sexual activity.
  • Reliable erections — Can provide predictable erections when the medication is used correctly and the appropriate dose has been established.
  • Individualised treatment — The medication and dosage can be tailored to each patient’s needs under the guidance of a urologist.

Your urologist will determine whether intracavernosal injection therapy is the most appropriate treatment based on your underlying condition, overall health and treatment goals.

Risks and Limitations of Intracavernosal Injection Therapy

Intracavernosal injection therapy is generally a safe and effective treatment for erectile dysfunction when used as prescribed and under the guidance of a urologist. However, like all medical treatments, it has potential risks and limitations that should be considered.

  • Injection-site discomfort — Mild discomfort may occur during or shortly after the injection, although the fine needle is generally well tolerated.
  • Bruising or minor bleeding — Small bruises or minor bleeding at the injection site can occasionally occur.
  • Penile pain — Some men may experience temporary penile discomfort or pain following the injection, depending on the medication used.
  • Prolonged erection (priapism) — Although uncommon, an erection lasting longer than four hours requires immediate medical attention to prevent permanent damage.
  • Scar tissue formation — Repeated injections into the same area or improper injection technique may increase the risk of scar tissue developing within the penis.
  • Requires self-injection — Successful treatment depends on learning and correctly performing the injection technique before sexual activity.
  • Not suitable for everyone — Men with certain bleeding disorders, penile abnormalities or other medical conditions may not be suitable candidates for intracavernosal injection therapy.

Your urologist will explain the potential risks and demonstrate the correct injection technique to help maximise treatment effectiveness while minimising complications.

What Results Can Patients Expect from Intracavernosal Injection Therapy?

Intracavernosal injection therapy can help many men with erectile dysfunction achieve an erection suitable for sexual activity, particularly when oral medications have not been effective. Individual results vary depending on the underlying cause of erectile dysfunction, overall health and correct use of the prescribed medication.

  • Improved erectile rigidity — The medication increases blood flow to help produce an erection suitable for sexual activity.
  • Rapid onset of action — An erection typically develops within a short period after the injection.
  • Temporary effect — The medication provides an erection for a limited duration and is used only when needed before sexual activity.
  • No cure for erectile dysfunction — Intracavernosal injection therapy treats the symptoms of erectile dysfunction but does not address the underlying cause.
  • Results depend on correct dosing — Achieving the best results requires the appropriate medication dose and proper injection technique.
  • Regular follow-up — Periodic review with your urologist helps monitor treatment effectiveness and allows adjustments to the medication dose if required.

With appropriate training and ongoing medical supervision, many men achieve reliable results and improved confidence using intracavernosal injection therapy.

Summary

Intracavernosal injection therapy is a well-established, non-surgical treatment for erectile dysfunction that can help men achieve reliable erections when oral medications are ineffective or unsuitable. When prescribed and used correctly, it offers an effective on-demand treatment that can be tailored to individual needs.

Although the treatment requires self-injection and regular follow-up, many men achieve satisfactory results with proper training and guidance. A consultation with a urologist can help determine whether intracavernosal injection therapy is the most appropriate treatment for your condition.

If oral medications have not been effective or are unsuitable for you, schedule a consultation with Dr Joe Lee to find out whether intracavernosal injection therapy may be an appropriate treatment for your erectile dysfunction.

Frequently Asked Questions

Most men experience only mild discomfort because the medication is administered using a very fine needle. Your urologist will teach you the correct injection technique to minimise discomfort.
An erection typically develops within a short period after the medication is injected, although the exact timing may vary between individuals and medications.
The duration of the erection depends on the medication, dosage and individual response. Your urologist will prescribe a dose that provides an erection appropriate for sexual activity without lasting longer than intended.
Yes. After receiving training from your urologist, most patients can safely perform the injections at home using the prescribed technique.
The frequency of use depends on the prescribed medication and your individual treatment plan. Your urologist will advise you on safe dosing intervals.
An erection lasting longer than two hours (priapism) is a medical emergency and requires immediate medical attention to reduce the risk of permanent damage.
Yes. Intracavernosal injection therapy is commonly recommended for men who have not achieved satisfactory results with oral erectile dysfunction medications or cannot take them.
When used correctly, intracavernosal injection therapy is generally safe. However, repeated improper injections may increase the risk of scar tissue formation, making regular follow-up important.
A urologist can assess your medical history, the cause of your erectile dysfunction and your treatment goals to determine whether intracavernosal injection therapy is an appropriate option for you.
AHS (Novena)
Mount Elizabeth Novena Specialist Centre 38 Irrawaddy Road #08-41 Singapore 329563
AHS (Alvernia)
820 Thomson Road Medical Centre Block A
#05-03 Singapore 574623

Book a Urology Consultation in Singapore

Have a urology or men’s health concern? Send us an enquiry and our clinic will assist with appointment availability and the next steps for your visit with Dr Joe Lee.
Book an appointment

    © 2026 All Rights Reserved by Asian Healthcare Specialists.
    cross