ICI vs Oral ED Medication in Tokyo: Which Treatment Is Right for You?
Erectile dysfunction (ED) is far more common than most men acknowledge, and seeking information about treatment options — especially in a foreign country — takes real courage.
This article is written for English-speaking men in Tokyo who want a clear, medically accurate explanation of the two main treatment pathways: oral PDE5 inhibitors (the class of drugs that includes sildenafil and tadalafil, commonly known by the brand names Viagra and Cialis) and intracavernosal injection (ICI) therapy, a physician-guided self-injection method used when oral medication is insufficient.
By the end of this page, you should have a solid understanding of how each option works, what clinical evidence says about effectiveness, realistic costs in Tokyo, and how to access an English-speaking consultation.
- How oral PDE5 inhibitors (sildenafil/tadalafil) work and when they are the right first step
- What ICI therapy is, which medications are used, and why it is effective for men who do not respond to pills
- A side-by-side comparison of both approaches: onset, duration, efficacy, side effects, and suitability
- Realistic costs for ED treatment in Tokyo
- How to access English-speaking ED consultations at BIOTOPE CLINIC in Shirokanedai
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
Understanding Oral PDE5 Inhibitors: Sildenafil and Tadalafil
PDE5 inhibitors are the globally recognised first-line pharmacological treatment for erectile dysfunction. They work by blocking an enzyme called phosphodiesterase type 5, which normally breaks down a chemical messenger (cyclic GMP) that relaxes smooth muscle in the penile arteries. By inhibiting this enzyme, the drugs allow blood to flow more freely into the erectile tissue in response to sexual stimulation.
It is important to understand that these medications do not produce an erection independently — sexual arousal is still required. They lower the physiological threshold for an erection by optimising the vascular response.
Sildenafil (the active ingredient in Viagra)
Sildenafil typically takes effect within 30 to 60 minutes and remains active for approximately four to six hours. It is taken on an as-needed basis, and absorption can be slowed significantly by high-fat meals. Doses range from 25 mg to 100 mg depending on individual response and tolerability.
Tadalafil (the active ingredient in Cialis)
Tadalafil has a notably longer duration of action — up to 36 hours — which many patients find more conducive to natural sexual activity without time pressure. It is available in on-demand doses (10–20 mg) or as a low daily dose (2.5–5 mg), the latter offering continuous background support. Tadalafil is less sensitive to food intake than sildenafil.
Clinical Effectiveness of Oral PDE5 Inhibitors
Large-scale clinical data support the efficacy of this drug class. Studies suggest that PDE5 inhibitors produce satisfactory erectile responses in approximately 60–70% of men with mild to moderate ED. However, response rates are lower in men with severe vascular disease, post-radical prostatectomy ED, or poorly controlled diabetes — in these groups, clinical reports indicate that oral efficacy may drop to 30–50%.
Common side effects include headache, facial flushing, nasal congestion, and, less commonly, transient visual disturbance (sildenafil) or back and muscle ache (tadalafil). These medications are contraindicated in men taking nitrate-based medications for heart conditions, due to the risk of severe hypotension.
Understanding ICI Therapy: Intracavernosal Injection
Intracavernosal injection (ICI) therapy involves injecting a small amount of vasoactive medication directly into the corpora cavernosa — the two cylinders of erectile tissue running along the penis — using a very fine needle. This sounds daunting to most men at first, but under proper physician guidance, the technique is manageable and highly effective.
Unlike oral medications, ICI acts locally and independently of systemic circulation. This means it can produce reliable erections even in men whose vascular response to oral PDE5 inhibitors is insufficient.
What Medications Are Used?
The most commonly used ICI formulations are:
- Alprostadil (Prostaglandin E1): A single-agent injection that is internationally approved and well-studied. It is often the starting point for ICI therapy.
- Bimix: A compounded two-drug combination, typically papaverine and phentolamine, which relaxes penile smooth muscle through complementary mechanisms.
- Trimix: A three-drug compounded formulation combining alprostadil, papaverine, and phentolamine. Clinical reports indicate Trimix produces higher efficacy rates and can allow for lower individual drug doses, potentially reducing side effects. Studies suggest response rates with Trimix exceed 85–90% even in men with severe vascular or neurological ED.
How ICI Is Introduced to a Patient
ICI is not a take-home prescription handed out at a first appointment. The patient is trained by the physician in the correct injection technique, dosing, and — critically — in recognising and responding to the primary risk: priapism (a prolonged erection exceeding four hours, which requires prompt medical attention). A test dose is typically administered in the clinic setting before the patient is authorised to self-administer at home.
Dr. Karibe’s Note
Many of our international patients at BIOTOPE CLINIC are surprised to find that ICI therapy is far less intimidating in practice than it sounds on paper.
The needle gauge is very fine — comparable to an insulin syringe — and once the technique is correctly learned, most patients report that discomfort is minimal. The psychological barrier is usually greater than the physical one.
A common question I receive is whether a patient must commit to injections permanently. The honest answer is no: ICI can be used on a situational basis, just as oral medication is, and some patients use it only occasionally as a reliable backup when oral therapy is insufficient.
ICI vs Oral PDE5 Inhibitors: Side-by-Side Comparison
The following table summarises the key clinical differences between oral PDE5 inhibitors and ICI therapy to help guide decision-making in consultation with a physician.
| Factor | Oral PDE5 Inhibitors (Sildenafil / Tadalafil) | ICI Therapy (Trimix / Bimix / Alprostadil) |
|---|---|---|
| Route of administration | Oral tablet | Self-injection into penile tissue |
| Requires sexual stimulation | Yes | Generally not required |
| Onset of action | 30–60 minutes (sildenafil); 30 minutes (tadalafil) | 5–15 minutes |
| Duration of action | 4–6 hours (sildenafil); up to 36 hours (tadalafil) | 30–60 minutes (dose-dependent) |
| Typical efficacy (all-cause ED) | 60–70% | 85–90%+ (especially Trimix) |
| Efficacy in severe/neurological/post-surgical ED | 30–50% | High — acts independently of systemic circulation |
| Primary risks | Hypotension with nitrates; headache; flushing | Priapism (prolonged erection); penile fibrosis with long-term use; injection-site discomfort |
| Contraindications | Nitrate medications; severe cardiac disease | Bleeding disorders; anticoagulation therapy; sickle cell disease |
| Physician training required | Prescription required; no injection training | In-clinic training session required before home use |
| Typical use case | Mild to moderate psychogenic or vascular ED | Moderate to severe ED; non-responders to oral therapy; post-prostatectomy ED |
Cost of ED Treatment in Tokyo
In Japan, erectile dysfunction medication is not covered by national health insurance (Koken Hoken) because it is classified as a lifestyle drug rather than a condition requiring mandatory coverage. All costs are therefore self-pay (jishu shinryo).
At BIOTOPE CLINIC in Shirokanedai, an initial consultation is priced at ¥3,300. A consultation specifically with Dr. Karibe for surgical or specialist assessment is ¥2,200. Ongoing oral PDE5 inhibitor prescriptions (sildenafil or tadalafil) are priced according to dose and quantity at the time of consultation.
ICI therapy involves an initial supervised in-clinic dosing session and training appointment, followed by a compounded prescription for home use. Pricing for ICI therapy — including the initial training session and the compounded medication (Trimix or Bimix) — will be discussed and confirmed at consultation, as formulation and dosing are tailored to the individual patient.
As a general reference for comparable private men’s health clinics in Tokyo, oral PDE5 inhibitor prescriptions typically range from ¥1,500 to ¥3,000 per tablet depending on dose and brand. ICI compounded preparations vary considerably with volume and formulation. For an accurate quote, we recommend booking a consultation.
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
Who Is a Good Candidate for Each Treatment?
Oral PDE5 Inhibitors Are Often Appropriate For:
- Men with mild to moderate ED, particularly where there is a psychological or situational component
- Those seeking a discreet, non-invasive, on-demand option
- Men whose ED is associated with lifestyle factors such as stress, alcohol use, or fatigue — and who are otherwise in good cardiovascular health
- Those who have not yet tried any pharmacological ED treatment
ICI Therapy Is Often Appropriate For:
- Men who have tried oral PDE5 inhibitors at adequate doses without satisfactory results
- Those with moderate to severe vascular ED, including men with poorly controlled diabetes or peripheral artery disease
- Post-radical prostatectomy patients (where nerve-sparing was incomplete or not performed)
- Men with spinal cord injuries or other neurological conditions affecting erectile function
- Those in whom oral medications are contraindicated (e.g. nitrate use for angina)
Who Should Avoid ICI Therapy:
ICI is not appropriate for men with bleeding disorders, those taking therapeutic anticoagulants (blood thinners), men with sickle cell disease or other conditions predisposing to priapism, or those with a history of Peyronie’s disease (penile fibrosis) unless evaluated carefully by a physician.
What People Often Get Wrong About ICI and Oral ED Therapy
Misconception 1: “If pills don’t work, nothing will.”
This is one of the most common — and most discouraging — beliefs among men who have tried sildenafil or tadalafil without success. In reality, non-response to oral PDE5 inhibitors does not mean that effective treatment is unavailable. ICI therapy operates through a fundamentally different mechanism and can produce reliable erections in men whose vascular or neurological pathways do not respond adequately to systemic oral medication. A failed oral trial should prompt a conversation with a physician about ICI — not a resignation to the situation.
Misconception 2: “ICI is a last resort reserved for the most extreme cases.”
In some contexts, particularly outside Japan and the US, ICI has historically been positioned as a third-line treatment behind oral medication and vacuum erection devices. However, contemporary urology guidelines recognise ICI as a highly effective second-line option with a strong evidence base, and many patients find it preferable to a vacuum device in terms of spontaneity and quality of the erection. It is a legitimate and well-established medical treatment — not an experimental or extreme measure.
Where to Get ED Treatment in Tokyo (English-Speaking Consultation)
Within our clinic group, English-speaking consultations are handled at BIOTOPE CLINIC in Shirokanedai (Minato-ku, Tokyo) by Dr. Jun Karibe. Our sister clinic, Kojimachi Dermatology & Plastic Surgery Clinic in Ichigaya (Chiyoda-ku), handles Japanese-language insurance dermatology as the group’s main office but does not currently have English-speaking doctors. All English enquiries and bookings are handled via LINE or WhatsApp through our BIOTOPE-based English-speaking team.
In Dr. Karibe’s clinical experience at BIOTOPE CLINIC, a significant proportion of international patients presenting with ED have already tried oral PDE5 inhibitors — often purchased online or through overseas prescriptions — without adequate medical supervision or dose titration. A proper in-person consultation allows for a full medical history review, discussion of cardiovascular safety, and the selection of the most appropriate treatment pathway, whether oral, injectable, or a combination approach. Both oral ED prescriptions (sildenafil/tadalafil) and physician-supervised ICI therapy are available at BIOTOPE CLINIC in Shirokanedai.
Frequently Asked Questions
- Q. Can I get a prescription for sildenafil or tadalafil in Japan as a foreigner?
- Yes. ED medication is legally available in Japan as a prescription drug from licensed clinics. Nationality is not a barrier to receiving a private (self-pay) prescription. BIOTOPE CLINIC provides English-speaking consultations for this purpose, and prescriptions can typically be issued at or shortly after the initial consultation, subject to the physician’s medical assessment.
- Q. Is ICI therapy legal and available in Japan?
- Alprostadil (single-agent injection) is approved in Japan for the treatment of ED. Compounded formulations such as Trimix and Bimix are prepared by licensed pharmacies under physician prescription. Availability and formulation options should be confirmed directly with the prescribing physician, as compounding practices can vary. Dr. Karibe can discuss what is currently available and appropriate at your consultation.
- Q. How many injections per week is it safe to use ICI?
- Most clinical guidelines recommend limiting ICI use to no more than three times per week, with at least 24 hours between doses, in order to minimise the risk of penile fibrosis (scarring of the injection site) with long-term use. Injection site rotation is also recommended. Your physician will advise on a safe regimen specific to your formulation and dose.
- Q. What should I do if I experience an erection lasting longer than four hours after an ICI injection?
- A prolonged erection lasting more than four hours (priapism) is a medical emergency requiring prompt treatment to prevent permanent tissue damage. Before being authorised for home use of ICI, patients are thoroughly briefed on the management protocol — which includes a reversal agent that can be administered at home in early cases, and the instructions for seeking emergency care if required. This safety training is a non-negotiable part of the ICI initiation process at BIOTOPE CLINIC.
- Q. Is psychological ED better treated with pills or injections?
- For primarily psychogenic (psychological) ED in men with no significant vascular impairment, oral PDE5 inhibitors are generally the preferred starting point. They can help restore confidence and break the anxiety cycle that often sustains psychogenic ED. ICI is more commonly reserved for organic (physical) causes, though the two can occasionally be used in combination under medical guidance.
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
Summary
Both oral PDE5 inhibitors and ICI therapy are well-evidenced, effective treatments for erectile dysfunction — but they serve different patient profiles. Oral sildenafil and tadalafil are appropriate first-line options for most men with mild to moderate ED, offering convenience and a low intervention threshold. ICI therapy, particularly Trimix, provides a powerful and reliable alternative for men who do not respond adequately to oral medication or for whom oral drugs are contraindicated — with clinical studies suggesting response rates above 85% in appropriately selected patients.
The most important step is an informed, private consultation with a qualified physician who can review your medical history, assess cardiovascular safety, and recommend the right treatment pathway for your specific situation. Self-medicating with unregulated online ED drugs — a risk that is particularly prevalent among international visitors who may not have access to a regular GP in Japan — carries genuine health risks that a short clinic visit can easily circumvent.
If you have questions about ED treatment, English-speaking consultations are handled at BIOTOPE CLINIC in Shirokanedai (Minato-ku, Tokyo) by Dr. Karibe. Our sister clinic Kojimachi Dermatology & Plastic Surgery Clinic in Ichigaya (Chiyoda-ku) handles Japanese-language insurance dermatology. English enquiries: LINE or WhatsApp.
24/7 Consultation & Booking
Book a Consultation or Treatment
Our English-speaking team responds via LINE or WhatsApp — usually the same day.
References
- Hatzimouratidis K, Amar E, Eardley I, et al. Guidelines on male sexual dysfunction: erectile dysfunction and premature ejaculation. European Urology. 2010;57(5):804–814.
- Shabsigh R, Padma-Nathan H, Gittleman M, et al. Intracavernous alprostadil alfadex is more efficacious, better tolerated, and preferred over intraurethral alprostadil plus optional actis: a comparative, randomized, crossover, multicenter study. Urology. 2000;55(1):109–113.
- Burnett AL, Nehra A, Breau RH, et al. Erectile Dysfunction: AUA Guideline. Journal of Urology. 2018;200(3):633–641.
- Montorsi F, Basson R, Adaikan G, et al. Sexual medicine: sexual dysfunctions in men and women. 3rd International Consultation on Sexual Medicine. 2010. Paris: Health Publications.
- Yuan J, Hoang AN, Romero CA, et al. Vacuum therapy in erectile dysfunction — science and clinical evidence. International Journal of Impotence Research. 2010;22(4):211–219.
Related Articles
You may also find these articles useful.
- Medical Weight Loss Tokyo: Options, Cost & Clinic Guide
- Medical Weight Loss Tokyo: English-Speaking Clinic Guide
- Medical Weight Loss Tokyo for Expats: Consultation
- English-Speaking Dermatologist Tokyo: Melasma & Pigmentation
SUPERVISED BY
Dr. Jun Karibe
MD
Director
Education & Career
Certifications
Awards
