What Is XEOMIN? A Quick Answer Before We Dive In

XEOMIN (incobotulinumtoxinA) is an FDA-approved botulinum toxin type A injection made by Merz Pharmaceuticals. It temporarily relaxes muscles to smooth wrinkles and treat certain medical conditions.

Here’s what you need to know at a glance:

Unlike Botox, XEOMIN contains only the pure 150 kDa neurotoxin — no accessory proteins. This matters because those extra proteins in other formulas may trigger your immune system over time, reducing how well the treatment works.

More than 84,000 people worldwide have been treated with XEOMIN injections. In clinical studies, no patients developed a secondary loss of response due to neutralizing antibodies — a real concern with some other neurotoxins.

I’m Dr. Thomas Jeneby, an Ivy League-trained, board-certified plastic surgeon based in San Antonio with over two decades of experience performing cosmetic procedures — including XEOMIN treatments for both aesthetic and medical indications. In this guide, I’ll walk you through everything you need to know to decide if XEOMIN is right for you.

What is XEOMIN and How Does It Work?

Title: Molecular Structure of Botulinum Toxin Type A; Creator: Spa Black; Description: Diagram showing the 150 kDa active neurotoxin core without complexing accessory proteins; License: Creative Commons Attribution 4.0; Alt Text: Diagram of the pure 150 kDa botulinum neurotoxin molecule; incobotulinumtoxinA

To understand XEOMIN, we have to take a quick look at it under the microscope. At its core, XEOMIN is an acetylcholine release inhibitor and neuromuscular blocking agent. When we inject it into a muscle or gland, it targets the very end of the nerves. Under normal circumstances, your nerves release a chemical messenger called acetylcholine to tell your muscles to contract or your glands to produce sweat or saliva.

XEOMIN stops this process in its tracks through a very elegant molecular dance. The active molecule is a pure 150 kDa neurotoxin. Once injected, it enters the nerve terminal and specifically targets a protein called SNAP-25. By cleaving this SNAP-25 protein, XEOMIN prevents the nerve from releasing acetylcholine into the neuromuscular junction. Without this chemical signal, the muscle simply cannot contract, or the targeted gland cannot secrete.

This state-of-the-art purification process is why many medical professionals call XEOMIN the “naked neurotoxin” or “SmartTox.” Traditional botulinum toxin products contain accessory or complexing proteins that wrap around the active neurotoxin. While these proteins occur naturally in the bacteria (Clostridium botulinum) that produces the toxin, they do not help the treatment work once it is injected. In fact, within just one minute of injection at physiological pH, these accessory proteins dissociate from the active neurotoxin anyway.

By utilizing a highly sophisticated double-filtration process, Merz Pharmaceuticals removes these unnecessary accessory proteins entirely. This leaves behind only the pure, active 150 kDa therapeutic component. If you would like to read the detailed biochemistry and clinical trial parameters, you can review the official FDA Package Insert.

Why go through all the trouble of filtering out these extra proteins? The answer lies in how our immune systems work. When your body detects foreign proteins, it can create neutralizing antibodies to fight them off. Over time, these antibodies can cause a “secondary lack of treatment response,” meaning the injections stop working as well or stop working entirely. Because XEOMIN contains no complexing proteins, the risk of your body developing resistance is incredibly low. To explore this purification advantage further, read our detailed breakdown: Is Xeomin Safer Than Botox?.

Therapeutic Uses of XEOMIN

While many people think of neurotoxins purely as a way to look refreshed, XEOMIN is highly valued in the medical community for treating several chronic, involuntary muscle and glandular disorders. The FDA has approved XEOMIN for several life-changing therapeutic indications:

• Chronic Sialorrhea: This refers to severe, chronic drooling, which is common in patients with neurological conditions like Parkinson’s disease, ALS, or cerebral palsy. XEOMIN is approved for adults and pediatric patients aged 2 years and older. By injecting the product directly into the parotid and submandibular salivary glands, we can significantly reduce excessive saliva production.
• Upper Limb Spasticity: Following a stroke, traumatic brain injury, or spinal cord injury, muscles in the arms, wrists, and fingers can become painfully tight and flexed. XEOMIN helps relax these hyperactive muscles in adults as well as pediatric patients aged 2 to 17 years (excluding spasticity caused by cerebral palsy), restoring mobility and easing daily care.
• Cervical Dystonia: This painful neurological condition causes involuntary, severe muscle contractions in the neck, forcing the head to twist into abnormal, uncomfortable positions. XEOMIN injections help relax these neck muscles to reduce pain and restore a more natural head alignment.
• Blepharospasm: This condition causes uncontrollable, rapid blinking or spasms of the eyelids that can temporarily render a patient functionally blind. XEOMIN relaxes the overactive eyelid muscles, allowing patients to keep their eyes open comfortably.

Aesthetic Uses of XEOMIN

In our San Antonio med spa, we frequently use XEOMIN to address dynamic wrinkles—the lines that form on our faces due to repetitive expressions like frowning, squinting, laughing, or raising our eyebrows. Over time, as our skin loses collagen, these temporary expression lines turn into permanent creases.

By carefully placing micro-injections of XEOMIN into the targeted facial muscles, we temporarily soften their movement. This allows the overlying skin to smooth out, giving you a naturally refreshed, youthful glow without making you look “frozen” or “done.” The primary cosmetic target areas include:

• Glabellar Lines: Often called the “11s,” these are the vertical frown lines that appear between your eyebrows when you concentrate, worry, or squint.
• Horizontal Forehead Lines: The parallel lines that form across your forehead when you raise your eyebrows.
• Lateral Canthal Lines: Commonly known as “crow’s feet,” these are the delicate fan-like lines that spread out from the outer corners of your eyes when you smile or laugh.

Comparing the Pure Neurotoxin to Other Injectables

Title: Before and After Eyes Treatment; Creator: Spa Black; Description: Side-by-side comparison of a patient’s eye area before and 14 days after neurotoxin injection at maximum contraction; License: Creative Commons Attribution 4.0; Alt Text: Before and after comparison of crow’s feet treatment around the eyes

When deciding on a wrinkle-relaxing treatment, the most common question we hear is: “How does this compare to Botox?”

The fundamental difference lies in the formulation. Botox (onabotulinumtoxinA) contains complexing proteins that surround the active neurotoxin molecule. XEOMIN (incobotulinumtoxinA) is a highly purified, single-ingredient formula. Because XEOMIN has none of these accessory proteins, it is less likely to trigger an immune response.

This is incredibly important if you plan on maintaining your treatments long-term. The historical rate of sensitization—meaning the development of neutralizing antibodies against botulinum toxin—ranges from 3% to 10% in patients treated with older, protein-heavy formulations. Once these antibodies form, patients experience a gradual loss of efficacy. Because XEOMIN is a “naked” neurotoxin, the risk of immunogenicity is virtually non-existent. In fact, during clinical trials for FDA approval, not a single patient demonstrated a secondary lack of treatment response due to neutralizing antibodies.

Another major clinical benefit of XEOMIN‘s pure formulation is its storage stability. Traditional neurotoxins must be kept under strict refrigeration or frozen temperatures at all times, even during shipping. If the cold chain is broken for even a short period, the product can lose its potency. XEOMIN, on the other hand, is uniquely stable at room temperature (up to 25°C or 77°F) for up to 3 to 4 years before it is reconstituted. This ensures that when the product is prepared for your treatment, it is at 100% potency.

To see the differences laid out clearly, take a look at the comparison table below:

Because both products utilize a 1:1 unit conversion, if you normally receive 20 units of Botox in your frown lines, you will generally require 20 units of XEOMIN to achieve the exact same clinical result. To read a deeper comparison of how these two industry giants match up, check out our articles on Xeomin vs Botox and see real-world cosmetic results at Xeomin Before and After Eyes Spa Black.

Dosage, Administration, and Safety Guidelines

Title: Clinical Injection Procedure; Creator: Spa Black; Description: A medical professional administering a precise facial injection to a patient; License: Creative Commons Attribution 4.0; Alt Text: Medical professional performing a precise facial injection

Safety is our absolute priority at Spa Black. To get the best results from XEOMIN, it must be prepared and administered with medical precision.

XEOMIN is supplied as a sterile, vacuum-dried lyophilized powder in single-dose vials of 50 Units, 100 Units, or 200 Units. Before your treatment, a medical professional reconstructs the powder using sterile, preservative-free 0.9% Sodium Chloride Injection, USP. Once reconstituted, the solution must be stored in a refrigerator (2°C to 8°C) and used within 24 hours to maintain its safety and potency.

The recommended dosages vary widely depending on the area we are treating. We customize every injection plan to match your unique muscle mass, facial anatomy, and therapeutic goals. According to the official Prescribing Information, here are the standard dosing guidelines:

• Upper Facial Lines (Simultaneous Treatment): When we treat frown lines, forehead lines, and crow’s feet at the same time, the maximum recommended total dose is 64 Units.
  • Glabellar Lines: 20 Units total, split into 4 Units across 5 specific injection sites.
  • Horizontal Forehead Lines: 20 Units total, split into 4 Units across 5 injection sites (administered alongside the glabellar lines).
  • Lateral Canthal Lines (Crow’s Feet): 24 Units total, split into 4 Units across 3 injection sites on each side.
• Chronic Sialorrhea (Adults): 100 Units total per session, split into 30 Units per parotid gland and 20 Units per submandibular gland on each side, repeated no sooner than every 16 weeks. We often use ultrasound guidance to ensure exact placement.
• Cervical Dystonia: The recommended initial dose is 120 Units, divided among the affected neck muscles based on head position and muscle hypertrophy.
• Blepharospasm: The recommended starting dose is 50 Units total (25 Units per eye), with 2.5 to 5 Units injected into specific sites around the eyelid.
• Upper Limb Spasticity (Adults): Up to 400 Units per treatment session, divided among the affected muscle groups in the shoulder, arm, wrist, and hand.

To see how these dosing guidelines compare to other products, you can read our comparison guide: Xeomin Dosing Compared to Botox.

Safety Warnings and Precautions

XEOMIN is an incredibly safe and highly effective treatment when administered by a qualified medical professional, but like all medical procedures, it comes with important safety considerations.

The FDA requires a boxed warning on all botulinum toxin products regarding the potential for the distant spread of toxin effect. In very rare instances, the effects of the injected toxin can spread beyond the injection site to other parts of the body. This can cause symptoms consistent with botulism, including severe muscle weakness, double or blurred vision, drooping eyelids (ptosis), and difficulty speaking or swallowing (dysphagia). These symptoms can occur hours to weeks after the injection and can be life-threatening if they affect your breathing muscles. The risk is highest in pediatric patients being treated for limb spasticity or patients with pre-existing neuromuscular disorders like ALS or myasthenia gravis.

For cosmetic patients, the most common side effects are very mild and temporary. They typically resolve on their own within a few days.

Potential Side Effects Include:

• Injection site bruising, redness, or mild swelling
• Mild headache or flu-like symptoms
• Temporary dry mouth or dry eyes
• Temporary drooping of the eyelid (ptosis) or eyebrow if the product migrates (which we prevent by using precise injection techniques and advising you not to rub the area after treatment)

Frequently Asked Questions

How long do the results last?

Most patients begin to notice their muscles relaxing within 3 to 5 days after their treatment, with full, beautifully smooth results visible at the 10 to 14-day mark. The total treatment duration typically lasts 3 to 4 months. As the product naturally breaks down, your muscle activity will slowly return, and dynamic wrinkles will begin to reappear. To maintain your refreshed look, we recommend scheduling maintenance treatments every 12 to 16 weeks.

Is the treatment safe long-term?

Yes, XEOMIN has an outstanding long-term safety profile. It has been used safely in both cosmetic and medical applications worldwide for over 15 years. Because it is highly purified and contains no complexing proteins, your body is incredibly unlikely to develop antibodies against it. This means you can enjoy consistent, beautiful results year after year without worrying about developing a secondary resistance to the product.

What is the cost of the procedure?

The cost of your XEOMIN treatment depends on how many units you need to achieve your desired results, the areas we are treating, and your provider’s experience. For a detailed breakdown of what to expect financially, please consult our comprehensive Xeomin San Antonio Cost Guide.

To help make your treatments even more affordable, Merz offers the Xperience+ rewards program. This patient savings program allows you to earn points on every treatment, which you can redeem for instant savings (up to $240 a year) on future XEOMIN injections. For medical indications like cervical dystonia or chronic sialorrhea, commercial health insurance plans often provide coverage, and patient assistance programs may be available to help cover out-of-pocket costs.

Conclusion

Whether you want to smooth out frown lines, treat chronic muscle spasms, or simply prevent new wrinkles from forming, XEOMIN offers a highly purified, modern, and clinically proven solution. By filtering out unnecessary accessory proteins, this “naked” neurotoxin delivers consistent, natural-looking results with an exceptionally low risk of treatment resistance.

At Spa Black in San Antonio, Texas, we believe that aesthetic medicine is a blend of science and art. Because our premier med spa is owned and led by renowned plastic surgeon Dr. Jeneby, you can rest assured that you are receiving the highest level of expert, personalized care. We don’t believe in a “one-size-fits-all” approach; we tailor every treatment plan to highlight your unique, natural beauty.

Ready to experience the pure benefits of XEOMIN for yourself? Schedule your personalized consultation today by visiting our Spa Black Xeomin Treatment page, and let us help you achieve a refreshed, confident version of you!