Trimix and Bimix in Tokyo: ICI Therapy Options, How They Work, and What to Expect
Erectile dysfunction (ED) affects millions of men worldwide, and for many, standard oral medications simply do not deliver reliable results. If you are living in or visiting Tokyo and exploring more targeted treatment options, intracavernosal injection (ICI) therapy — using compounded medications such as Trimix or Bimix — may be worth discussing with a specialist. This article explains what these therapies involve, how they compare, what results are realistic, and what costs to anticipate at a Tokyo clinic.
What you’ll learn in this article:
- What Trimix and Bimix are, and how ICI therapy differs from oral ED medication
- How each formulation works and which patients tend to benefit most
- Realistic cost ranges for ICI therapy in Tokyo
- Safety considerations, side effects, and who is a suitable candidate
- How to access English-speaking ED consultations in Tokyo
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
What Are Trimix and Bimix?
Trimix and Bimix are compounded injectable medications used in the treatment of erectile dysfunction. They are administered directly into the erectile tissue of the penis — a method known as intracavernosal injection (ICI) — rather than taken orally.
The key difference lies in their composition. Bimix contains two active agents: typically papaverine (a smooth-muscle relaxant) and phentolamine (an alpha-adrenergic blocker). Trimix adds a third component — alprostadil (a synthetic prostaglandin) — which works through an additional physiological pathway, generally producing a stronger and more reliable response.
Both formulations work by relaxing the smooth muscle tissue in the penile arteries and corpus cavernosum, allowing blood to flow in and produce an erection. Unlike PDE5 inhibitors (such as sildenafil or tadalafil), ICI therapy does not require sexual arousal to initiate — though arousal may enhance the experience.
Trimix vs Bimix: A Side-by-Side Overview
| Feature | Bimix | Trimix |
|---|---|---|
| Active components | Papaverine + Phentolamine | Papaverine + Phentolamine + Alprostadil |
| Typical onset | 5–15 minutes | 5–15 minutes |
| Duration of erection | 30–60 minutes (variable) | 30–90 minutes (variable) |
| Relative potency | Moderate | Higher (suitable for more refractory ED) |
| Risk of penile pain | Lower (no alprostadil) | Slightly higher (alprostadil can cause mild discomfort) |
| Risk of priapism | Present — requires dose titration | Present — requires dose titration |
| Typical use case | Mild–moderate ED; alprostadil intolerance | Moderate–severe ED; oral medication non-responders |
How ICI Therapy Works in Practice
The injection is administered using a very fine-gauge needle into the lateral side of the penile shaft — a technique that, while unfamiliar at first, most patients learn to perform independently at home after physician training. The injection itself takes only a few seconds.
Following injection, smooth muscle relaxation occurs, arterial blood flow increases substantially, and an erection typically develops within 5 to 15 minutes. The response does not depend on achieving a specific psychological state beforehand, making ICI therapy particularly valuable for men whose ED has a significant neurogenic or vascular component.
Dosing is individualised. A physician will begin with a low test dose in clinic to observe the response, then adjust the concentration gradually until an appropriate erection duration — typically 30 to 60 minutes — is achieved without adverse effects such as prolonged erection (priapism). Self-injection at home only begins once the patient is comfortable with the technique and the dose has been established safely.
Why Some Patients Require ICI Therapy Rather Than Oral Medication
PDE5 inhibitors are effective for a large proportion of men with ED, but they are not universally successful. Studies suggest that oral PDE5 inhibitors fail to produce a satisfactory response in approximately 30–35% of men with ED, particularly those with diabetes, post-prostatectomy status, severe vascular disease, or spinal cord injury. For these patients, ICI therapy represents a well-established second-line option with strong clinical evidence.
Clinical reports indicate that ICI therapy with alprostadil-based or combination formulations achieves satisfactory erections in approximately 70–90% of men who have not responded adequately to oral agents, depending on the underlying aetiology and the formulation used.
Dr. Karibe’s Note
Many of our international patients are surprised to find that self-injection therapy can be straightforward once you have been properly trained.
A common concern I hear is that the injection must be painful or complicated — in practice, most patients feel confident performing it independently after just one or two supervised sessions in clinic.
The key is proper dose titration from the start, which is why beginning with a supervised test dose is essential rather than attempting to source or adjust these medications independently.
What People Often Get Wrong About ICI Therapy
Misconception 1: “ICI therapy is only for the most extreme cases of ED.”
In reality, ICI therapy is a recognised second-line treatment and is appropriate for any man who has not achieved satisfactory results with oral PDE5 inhibitors, regardless of the severity of underlying pathology. It is used widely in men with psychogenic ED, diabetic neuropathy, mild vascular insufficiency, and post-surgical cases.
Misconception 2: “Trimix is always stronger and therefore always better.”
Trimix is not universally preferable. Some patients find alprostadil causes penile aching, in which case Bimix — which contains no alprostadil — may be more comfortable and equally effective at appropriate concentrations. The right formulation depends on the individual’s tolerance, underlying cause, and response profile, which is why physician-guided dose titration matters.
Trimix and Bimix Cost in Tokyo
ICI therapy for ED in Japan is not covered by national health insurance when used for cosmetic or non-acute purposes, and compounded formulations such as Trimix and Bimix are not commercially available as standard pharmaceutical products in Japan — they must be prepared by a licensed compounding pharmacy under physician prescription.
At BIOTOPE CLINIC in Shirokanedai, men’s health consultations including ED evaluation and ICI therapy are available under Dr. Karibe’s care. The following costs are indicative:
- Initial consultation: ¥3,300 (general) or ¥2,200 (Dr. Karibe surgical / specialist consultation)
- ED evaluation and treatment planning: Included as part of the consultation; additional diagnostic tests may apply
- ICI formulation (Trimix / Bimix) — compounded supply: Pricing varies based on concentration, volume, and frequency of use; this will be discussed and quoted during your consultation
- In-clinic dose titration sessions: Charged separately; your doctor will advise on the number of sessions required
Because compounded ICI medications are prepared to individual prescription and the required concentration varies considerably between patients, a precise per-vial figure cannot be published here without being misleading. For an accurate quote, we recommend booking a consultation.
As a general point of reference, ICI therapy in comparable private clinic settings in major Asian cities typically involves an ongoing per-cycle cost that is competitive with premium-tier oral ED medications once a stable dose has been established.
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
Before, During, and After: What to Expect
Before Treatment
A thorough ED consultation should include a review of medical history, current medications, cardiovascular risk factors, and any previous treatments tried. Blood tests and, in some cases, further vascular or hormonal assessment may be recommended to determine the most likely underlying cause and to confirm that ICI therapy is appropriate. Men taking nitrate medications or certain antihypertensives will require careful assessment before any ED therapy is initiated.
During the Injection Session
The first injection is performed by the physician in clinic to assess your response to a low test dose. The injection site is cleaned, and a fine needle is used to deliver the medication into the lateral aspect of the penile shaft — most patients describe minimal discomfort, comparable to a routine blood test. The physician will monitor for response and for any signs of exaggerated effect over the following 30–60 minutes.
After Treatment and Ongoing Self-Use
Once a safe and effective dose has been identified, patients are trained to self-administer at home before sexual activity. Injections should not be used more than two to three times per week, with at least 24 hours between uses, to minimise the risk of fibrosis (scar tissue formation) at the injection site. Any erection lasting more than four hours (priapism) requires emergency medical attention and patients should be given clear written guidance on this before beginning self-injection.
At BIOTOPE CLINIC in Shirokanedai, Dr. Karibe provides follow-up review to ensure dose appropriateness, assess injection-site health, and address any concerns that arise during self-use. Ongoing monitoring is an important part of safe ICI therapy, not a one-time event.
Who Is a Good Candidate for Trimix or Bimix?
ICI therapy may be appropriate for men who:
- Have not achieved satisfactory results with oral PDE5 inhibitors (sildenafil, tadalafil, etc.)
- Cannot take oral PDE5 inhibitors due to contraindications (e.g. concurrent nitrate use, certain cardiac conditions — always discuss with your doctor)
- Have ED related to diabetes, neurological conditions, spinal cord injury, or post-prostatectomy status
- Prefer a treatment option that does not depend on systemic drug absorption or gastric timing
- Are willing to learn and maintain a self-injection technique under physician guidance
ICI therapy is generally not suitable for men with bleeding disorders, those on therapeutic anticoagulation where injection carries significant risk, those with anatomical conditions of the penis that preclude safe injection, or those who are psychologically unwilling to self-inject. A full clinical assessment is always necessary before beginning this therapy.
For men whose ED responds well to oral therapy, BIOTOPE CLINIC also offers PDE5 inhibitor prescribing (sildenafil and tadalafil) as part of its men’s health service — this is a treatment available at BIOTOPE CLINIC in Shirokanedai, and is worth discussing during a consultation with Dr. Karibe if you are unsure which approach suits you best.
Where to Get ICI Therapy 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 and is the group’s main office — it does not currently offer English-language doctor consultations. All enquiries and bookings in English should be directed to BIOTOPE. Bookings and enquiries in English: LINE or WhatsApp.
Frequently Asked Questions
- Q. Is Trimix legal and available in Japan?
- Trimix and Bimix are compounded medications, meaning they are prepared to individual prescription by a licensed compounding pharmacy rather than sold as standard commercial products. They are legal to prescribe and dispense in Japan under a physician’s supervision, but they cannot be purchased over the counter or imported independently. All ICI therapy at BIOTOPE CLINIC is managed through proper medical prescription and sourcing channels.
- Q. How soon does the injection work, and how long does the erection last?
- An erection typically begins within 5 to 15 minutes of injection. Duration varies by formulation and individual dose, but the goal of titration is to achieve a functional erection lasting approximately 30 to 60 minutes. Any erection lasting more than four hours requires emergency medical attention; patients receive written guidance on this before starting self-injection.
- Q. Can I use Trimix or Bimix alongside oral ED medication?
- Combining ICI therapy with oral PDE5 inhibitors is generally not recommended unless specifically advised by your physician, as the combined effect on blood pressure and erectile tissue can be unpredictable and potentially unsafe. Your doctor will assess your current medications and recommend a safe treatment pathway.
- Q. Will the injections cause permanent damage to the penis?
- When used correctly, at the recommended frequency and at an appropriate dose, ICI therapy has a well-established long-term safety record. The primary risk of overuse is the gradual development of fibrosis (scar tissue) at injection sites over time, which is why adherence to frequency guidelines and regular physician review are important parts of ongoing management.
- Q. I have tried sildenafil without success. Is Trimix likely to work for me?
- Clinical data suggest that ICI therapy — particularly Trimix — can be effective in a significant proportion of men who do not respond adequately to oral PDE5 inhibitors, including those with diabetic, neurogenic, or vascular ED. However, outcomes depend on the individual’s underlying condition, and a proper assessment is required before any prediction can be made. A consultation with Dr. Karibe is the recommended first step.
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
Summary
Trimix and Bimix represent well-established, physician-supervised options for men with erectile dysfunction who have not found adequate relief through oral medications. Both formulations act directly on penile smooth muscle, bypassing the systemic limitations of oral therapy and making them suitable for a wider range of underlying causes — including vascular, neurogenic, and diabetic ED.
The choice between Bimix and Trimix depends on individual response, tolerability, and the severity of the condition. Safe use requires proper clinical evaluation, supervised dose titration, and ongoing follow-up — none of which can be replaced by sourcing medication independently.
For expatriates and international visitors in Tokyo, accessing these treatments in English can be a practical barrier. BIOTOPE CLINIC in Shirokanedai provides English-language men’s health consultations, ED evaluation, and ICI therapy management under Dr. Karibe’s care, with the full support of an English-speaking team.
If you have questions about Trimix, Bimix, or ICI therapy options in Tokyo, 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.
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Book a Consultation or Treatment
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References
- Porst H, Buvat J, Meuleman E, et al. Intracavernous Alprostadil Alfadex — an effective and well tolerated treatment for erectile dysfunction. Results of a long-term European study. International Journal of Impotence Research. 1998.
- Bella AJ, Brant WO, Lue TF, Brock GB. Non-arteritic anterior ischemic optic neuropathy (NAION) and phosphodiesterase type-5 inhibitors. Canadian Urological Association Journal. 2006.
- 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.
- Hatzimouratidis K, Amar E, Eardley I, et al. Guidelines on male sexual dysfunction: erectile dysfunction and premature ejaculation. European Urology. 2010.
- Alprostadil Sterile Powder Study Group. Self-injection therapy for impotence: a five-year follow-up. Journal of Urology. 1994.
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