Penile Botox Injections: Botulinum Toxin Treatment for Sexual Performance

Botulinum toxin—commonly known by the brand name Botox—has revolutionized aesthetic medicine over the past two decades. While most people associate it with wrinkle reduction, this versatile neurotoxin has found innovative applications in sexual medicine, including penile injections designed to enhance male sexual function and performance.

This guide reviews what the published research does and does not show about penile botulinum toxin injections — for premature ejaculation, for erectile function, and for flaccid retraction. It is a review of the field, not a description of a service we sell.

Understanding Botulinum Toxin: More Than Just Cosmetic Medicine

Botulinum toxin represents one of medicine’s most studied biological substances, with applications extending far beyond wrinkle reduction. The FDA has approved various botulinum toxin formulations for over 20 medical conditions, from muscle spasticity to chronic migraines.

How Botulinum Toxin Works:

At the molecular level, botulinum toxin blocks the release of acetylcholine—a neurotransmitter responsible for muscle contraction. When injected into specific muscles, it creates temporary, localized muscle relaxation lasting several months. This mechanism, while simple in concept, enables sophisticated therapeutic applications when applied with anatomical precision.

In penile applications, strategically placed botulinum toxin injections can modulate muscle activity affecting sexual function, ejaculatory control, and erectile quality. Rather than systemic effects, the treatment works locally on targeted muscles while leaving surrounding tissues and functions intact.

Primary Applications: What Penile Botox Actually Treats

Premature Ejaculation: The Most Common Application

Premature ejaculation affects 20-30% of men at some point in their lives, making it the most prevalent male sexual dysfunction. Defined as consistent ejaculation occurring within one minute of penetration (or before desired), PE causes significant distress for both men and their partners.

The Physiological Basis:

During ejaculation’s expulsion phase, the bulbospongiosus muscle undergoes rhythmic contractions that propel semen through the urethra. In men with premature ejaculation, these contractions may occur too readily or forcefully. The theory behind the treatment is that botulinum toxin injected into the bulbospongiosus muscle reduces that excessive contractility and so extends the time to ejaculation. That is the rationale; it is not a settled finding.

What the Research Shows:

Multiple clinical studies have documented the effectiveness of botulinum toxin for premature ejaculation:

• A 2024 randomized controlled trial found that a single injection of botulinum toxin into the bulbospongiosus muscle produced statistically significant improvements in ejaculatory latency time at 1 and 3 months
• A 2025 comparative study reported larger improvements with botulinum toxin than with hyaluronic acid injection in one small group of men. It is a single study, it has not been repeated, and we would not use it to tell you one is better than the other
• A 2024 systematic review examining injections at three different sites found the most significant improvement (108% increase in ejaculatory latency) when injecting the ischiocavernosus muscle

As with many emerging treatments, research shows variability in individual response. Some patients experience substantial improvements while others see more modest benefits. This variability reflects the complex nature of premature ejaculation and underscores the importance of proper patient selection and technique.

Where the Reported Benefit Concentrates:

Research shows mixed results. Across the published series, the reported benefit concentrates in men with:

• Lifelong (primary) premature ejaculation rather than acquired cases
• Clear bulbospongiosus muscle hyperactivity
• Inadequate response to first-line treatments (SSRIs, numbing sprays and creams)
• Realistic expectations about modest rather than dramatic improvements

In the literature it is positioned as an adjunctive therapy rather than a first-line treatment, considered only after conventional approaches have proven insufficient.

Erectile Function Enhancement

Beyond premature ejaculation, botulinum toxin shows promise for improving erectile function through multiple mechanisms:

Smooth Muscle Relaxation: The penis contains smooth muscle tissue within the corpus cavernosum that must relax for blood to fill the erectile chambers. Botulinum toxin injected directly into erectile tissue can enhance this relaxation response, potentially improving erection quality.

Increased Blood Flow: By reducing smooth muscle tone, botulinum toxin may facilitate better arterial inflow and more efficient venous occlusion—the two key vascular components of healthy erections.

Autonomic Modulation: The treatment may favor parasympathetic (pro-erectile) activity over sympathetic (anti-erectile) tone, creating a more favorable neurological environment for erectile function.

Clinical Application:

In the published series this approach has been used as adjunctive therapy for men who:

• Experience incomplete response to oral ED medications (sildenafil, tadalafil, etc.)
• Seek alternatives to more invasive options like penile injections or vacuum devices
• Have erectile dysfunction with presumed smooth muscle dysfunction component
• Want to potentially reduce reliance on oral medications

In Giuliano et al. (2022) — a retrospective series of 123 consecutive men whose ED had not responded adequately to PDE5 inhibitors or prostaglandin injections — erectile function improved for at least six months in 41% of them, on one injection, with two minor adverse events reported (PubMed).

Penile Retraction Reduction

Some men experience excessive penile retraction—a hyperactive reflex causing the penis to retract significantly when flaccid. This can affect how men feel in locker rooms and create the perception of smaller size despite normal measurements when measured properly.

The Treatment Approach:

Injecting botulinum toxin into the dartos muscle (the smooth muscle layer beneath penile skin) can reduce this excessive retraction reflex, allowing the penis to hang more naturally in its flaccid state.

Expected Outcomes:

• Improved flaccid length appearance without changing actual erect size
• Reduced “turtle” retraction in cold environments or during stress
• Greater ease in situations where flaccid appearance matters
• Effects lasting about 6 months before retreatment needed

This application addresses psychological concerns related to flaccid appearance rather than functional sexual problems, but the impact on self-image can be meaningful for affected individuals.

Glans Sensitivity Reduction

For men whose premature ejaculation is driven by a hypersensitive glans, injecting botulinum toxin into the glans tissue is intended to create a mild desensitizing effect. The evidence for this specific application is thinner than for the muscle injections above.

This differs from numbing sprays and creams by:

• Providing longer-lasting effect (months vs. minutes)
• Avoiding the numbing sensation that affects partner pleasure
• Maintaining sufficient sensation for pleasure while reducing hypersensitivity

However, this application requires exceptional skill and precision, as excessive desensitization could impair sexual pleasure unacceptably.

The Procedure: What to Expect

Understanding the treatment process helps set appropriate expectations and reduces anxiety about the procedure itself.

Pre-Treatment Consultation

In the published protocols, treatment begins with a comprehensive evaluation including:

Medical History Review: a clinician assesses overall health, current medications, prior treatments for sexual dysfunction, and any conditions that might affect candidacy or outcomes.

Physical Examination: A focused genital examination identifies anatomical considerations and confirms appropriate muscle targets for injection.

Functional Assessment: validated questionnaires and tools measure baseline sexual function, establishing metrics for evaluating treatment response.

Expectation Setting: honest discussion of realistic outcomes, potential side effects, and alternative approaches, so the decision is an informed one.

The Injection Procedure

Preparation: Local anesthesia (a field block) is used to numb the area before the injection.

Injection Technique:

Placement is guided by ultrasound so the injection reaches the intended muscle and avoids the structures around it. The treating physician sets the dose, the target and the number of injection points for the individual and for what is being treated — those are decisions made at the visit, not numbers we publish.

Duration: The entire procedure typically requires 15-30 minutes including preparation, injection, and post-procedure observation.

Discomfort Level: Most patients describe minimal discomfort with proper anesthetic use. The sensation is comparable to any other injection—brief pinching or stinging that resolves within seconds.

Post-Procedure Protocol

Immediate Aftercare:

• Apply ice packs for 20 minutes to reduce swelling and discomfort
• Avoid strenuous physical activity for 24 hours
• Refrain from sexual activity for 7 days

The Waiting Period: Botulinum toxin effects don’t appear immediately. The toxin requires 3-7 days to bind to nerve terminals and begin exerting effects, with full impact typically apparent at 10-14 days post-injection.

Monitoring Response: study protocols schedule follow-up at 2-4 weeks to assess initial response, and again at 3 months to evaluate peak effectiveness. Standardized questionnaires and patient-reported outcomes are used to measure improvements.

Expected Results and Realistic Outcomes

Understanding what botulinum toxin can and cannot accomplish helps ensure satisfaction with outcomes.

For Premature Ejaculation

Typical Results:

• Ejaculatory latency time improvements ranging from 30-60 seconds in responsive patients
• Some studies report up to 100% increases, though individual variation is substantial
• Effects peak at 1-3 months post-injection
• Gradual decrease in effectiveness after 3 months, with minimal benefit by 6 months

Success Factors: Not all patients respond equally. Better outcomes associate with:

• Primary (lifelong) rather than secondary (acquired) PE
• Clear muscle hyperactivity versus other PE causes
• Younger age (some studies show positive correlation between age and response)
• Realistic expectations of modest rather than dramatic improvement

For Erectile Function

Typical Results:

• Improved erection firmness in approximately 50% of treatment-resistant patients
• Enhanced response to oral ED medications when used concurrently
• Better spontaneous morning erections in some patients
• Subjective improvements in sexual satisfaction and performance

Important Limitations: Botulinum toxin is not a standalone solution for severe ED. It works best as adjunctive therapy complementing other treatments rather than replacing them.

Duration and Maintenance

All botulinum toxin effects are temporary:

• Initial effects: 3-7 days post-injection
• Peak effectiveness: 4-8 weeks post-injection
• Duration: about 6 months typical, with individual variation
• Maintenance: repeat treatments about every 6 months to sustain benefits

This temporary nature has both advantages (ability to discontinue if unsatisfactory) and disadvantages (ongoing cost and commitment required for long-term benefit).

Safety Profile and Potential Side Effects

Botulinum toxin products carry an FDA warning about effects spreading beyond the injection site. See the safety note.

Beyond those, the side effects reported in the published series have mostly been mild and short-lived.

Common, Mild Side Effects

These occur in 5-15% of patients and resolve spontaneously:

• Bruising at injection sites lasting 3-7 days
• Swelling of injected area, typically mild and brief
• Injection site discomfort resolving within 2-3 days
• Temporary numbness or altered sensation in injected areas

Less Common, Functional Side Effects

Clinical studies report these in approximately 10% of patients:

Post-Micturition Dribbling: Two to six percent of patients experience dribbling after urination, typically resolving within 2 months as botulinum effects wear off. This occurs when toxin affects periurethral muscles involved in urinary control.

Temporary Erectile Dysfunction: Rarely, excessive smooth muscle relaxation can temporarily impair erectile function. This paradoxical effect is uncommon but underscores the importance of precise dosing and placement.

Incomplete Urination: Occasional difficulty with complete bladder emptying may occur if toxin affects urethral sphincter muscles.

Serious Complications

Severe adverse events are rare when procedures follow proper protocols:

• Infection at injection sites (< 1% incidence)
• Priapism — an erection that will not go down. This is a medical emergency: if an erection lasts more than four hours, go to an emergency department rather than waiting
• Allergic reactions to botulinum toxin, which are rare
• Spread of toxin effect away from the injection site — see the FDA warning below. It is uncommon; the symptoms to act on are trouble swallowing, speaking or breathing

Contraindications

Certain conditions preclude treatment:

• Absolute: Known allergy to botulinum toxin, active genital infections, neuromuscular disorders (myasthenia gravis, Lambert-Eaton syndrome)
• Relative: Current anticoagulation therapy, bleeding disorders, unrealistic expectations, significant psychological pathology

Comparing Botulinum Toxin to Alternative Treatments

For Premature Ejaculation

SSRIs (Selective Serotonin Reuptake Inhibitors):

• Effectiveness: Generally more consistent than botulinum toxin, with 2-3 fold increases in IELT
• Timing: Require daily dosing (paroxetine, sertraline) or on-demand use (dapoxetine)
• Side Effects: Sexual side effects (reduced libido, delayed orgasm), gastrointestinal effects, mood changes
• Cost: Generally less expensive than repeated botulinum injections

Where this leaves it: botulinum toxin has been studied primarily in men who had tried and failed first-line treatments. The mixed research evidence and temporary effects make it, at best, adjunctive rather than initial therapy. Upsize™ does not offer it for premature ejaculation.

For Erectile Dysfunction

Where this leaves it: for erectile dysfunction, botulinum toxin has been studied as adjunctive therapy alongside oral medications rather than as a replacement for them, and not for men who have not yet tried standard treatments. This is the one application on this page that overlaps with what we perform — see Firm-X™.

Who Makes a Good Candidate?

Appropriate patient selection significantly impacts satisfaction with botulinum toxin treatments.

How These Injections Are Performed in Practice

Where these injections are performed, the protocols reported in the literature share a common shape:

Comprehensive Evaluation

Assessment before treatment typically includes:

• Detailed sexual history using validated questionnaires (IELT measurements, PEDT scores, IIEF assessments)
• Physical examination to identify anatomical factors
• Review of prior treatments and their outcomes
• Psychological screening to identify treatable psychological components
• Discussion of all treatment options, not just botulinum toxin

Evidence-Based Protocols

Established clinical methods include:

• Ultrasound-guided injection for accurate muscle targeting
• Dosing set by the treating physician for the application and the patient
• Injection technique appropriate to the target tissue
• Local anesthesia for patient comfort
• Post-procedure monitoring with structured follow-up at 2 weeks, 1 month, and 3 months

Combination Approaches

Botulinum toxin is generally combined with other treatments rather than used alone:

• Continuing oral medications for ED while adding botulinum toxin
• Combining premature ejaculation treatments (SSRIs + botulinum toxin + behavioral techniques)
• Adding pelvic floor physical therapy to address muscle dysfunction
• Incorporating counseling when psychological factors contribute

Realistic Counseling

Anyone considering it should be counselled about:

• The mixed and evolving state of research evidence
• Individual variation in response (some men benefit significantly, others minimally)
• Temporary nature requiring ongoing treatments
• Costs and financial commitment for maintaining results
• Alternative approaches that might be more appropriate

The Current State of Evidence: What We Know and Don’t Know

Scientific understanding of penile botulinum toxin continues evolving, with both encouraging findings and important limitations.

What the Research Supports

Multiple clinical studies demonstrate:

• Botulinum toxin produces measurable increases in ejaculatory latency in properly selected patients
• The treatment demonstrates a favorable safety profile with low rates of serious complications
• Effects are temporary, lasting about 6 months
• Success rates improve with proper patient selection and injection technique

What Remains Uncertain

Ongoing research continues to refine:

• Optimal injection sites and techniques for maximum effectiveness
• Ideal dosing protocols for different patient populations
• Long-term safety data beyond initial 12-month studies
• Predictive factors for identifying best responders

Where the Evidence Lands

On the current evidence, penile botulinum toxin is best described as:

• A treatment option worth discussing for carefully selected patients with premature ejaculation, on an evidence base that is early and mixed
• Particularly beneficial for men who’ve had inadequate response to conventional treatments
• Most successful when used as part of a comprehensive treatment approach
• Generally well tolerated in the published series when performed by experienced practitioners

Individual results vary, and outcomes depend on patient selection, technique and realistic expectations.

Costs and Insurance Considerations

Understanding financial implications helps with decision-making:

Upsize™ does not offer botulinum toxin for premature ejaculation, so we do not quote a price for it. What we do price is Firm-X™, the penile neuromodulator injection for erectile firmness and flaccid hang — $1,890 per treatment, listed on our pricing page.

Insurance Coverage: Penile botulinum toxin represents off-label use without FDA approval for sexual dysfunction indications. Insurance companies typically do not cover:

• The botulinum toxin cost
• The procedure fees
• Follow-up visits related to the treatment

Patients should expect to pay entirely out-of-pocket for these services.

Cost-Benefit Considerations: Compare botulinum toxin’s ongoing costs to alternatives:

• Generic SSRIs: $10-30/month
• PDE5 inhibitors: $30-50/month (generic)
• Behavioral therapy: $100-200/session for 6-10 sessions
• Intracavernosal injections: $200-400/month

For many patients, the temporary nature and need for repeat treatments make botulinum toxin more expensive than oral medications over extended periods. However, men who’ve failed multiple cheaper alternatives may find the investment worthwhile if treatment proves effective.

What Upsize™ Offers, and What It Does Not

Upsize™ performs two injectable procedures, and neither one is a premature-ejaculation treatment:

• The Upsize™ procedure — hyaluronic acid filler for girth, up to 2 inches depending on volume, lasting 18–24 months.
• Firm-X™ — a neuromodulator injection for erectile firmness and flaccid hang, lasting about 6 months. This is the one application on this page that we actually perform, and the evidence behind it is set out above: three peer-reviewed studies, improvement at six months, off-label and not FDA-approved.

We do not inject the bulbospongiosus muscle for ejaculatory control, we do not inject the glans to reduce sensitivity, and we do not run a premature-ejaculation programme of any kind.

If Premature Ejaculation Is Your Concern

If ejaculatory control is what brought you to this page, the honest answer is that we are not the clinic for it. The first-line treatments — SSRIs prescribed by a physician, behavioural techniques, and pelvic floor physical therapy — have a stronger evidence base than the injections described above, and a urologist or your primary care physician is the right place to start.

If what you want is girth, or firmer erections and less flaccid retraction, those we do treat. See what each procedure costs, or book a free phone consultation with a patient coordinator.