Xeomin is a botulinum toxin injection used for both medical and cosmetic purposes. It’s FDA-approved to treat five conditions: frown lines between the eyebrows, cervical dystonia (involuntary neck muscle contractions), blepharospasm (uncontrollable eyelid spasms), upper limb spasticity, and chronic sialorrhea (excessive drooling). It works the same way as Botox, with one key difference: Xeomin is purified to contain only the active toxin molecule, with no extra bacterial proteins attached.
How Xeomin Works
Your muscles contract when nerves release a chemical messenger called acetylcholine at the junction where nerve meets muscle. Xeomin blocks that process. Once injected, the toxin enters the nerve ending and cuts a protein (called SNAP-25) that’s essential for releasing acetylcholine. Without that signal, the targeted muscle relaxes. This is the same mechanism behind all botulinum toxin products, including Botox and Dysport.
What sets Xeomin apart is its formulation. It’s sometimes called the “naked toxin” because it’s been stripped of all complexing proteins, the extra bacterial proteins that surround the active molecule in other products. This matters because your immune system can develop antibodies against those extra proteins over time, potentially making treatments less effective. With fewer foreign proteins in the mix, Xeomin carries a lower theoretical risk of triggering that immune response. This is most relevant for people who use high doses for medical conditions or plan to get injections for many years.
Cosmetic Use: Frown Lines
Xeomin’s most widely known use is smoothing the vertical lines that form between your eyebrows when you frown, called glabellar lines. The standard treatment is 20 units total, split into five small injections: two in each of the muscles that pull your brows together, and one in the muscle between them that pulls your brows downward.
Some people notice results in as few as two to three days, though full effects typically take up to 14 days to develop. Results last about three to four months before the muscle activity gradually returns and retreatment is needed. The most common side effect at cosmetic doses is headache, reported in just over 1% of patients.
In terms of potency, Xeomin and Botox use a 1:1 dosing ratio. If you’ve been getting 20 units of Botox for your frown lines, you’d get 20 units of Xeomin. Clinical trials confirmed that the two products perform comparably at equivalent doses.
Cervical Dystonia
Cervical dystonia causes the neck muscles to contract involuntarily, pulling the head into abnormal positions and often causing significant pain. Xeomin is approved for adults with this condition, whether or not they’ve had botulinum toxin treatment before. The clinical effect begins to appear within about four days of injection, and treatments are typically spaced three to six months apart.
The most common side effects when treating cervical dystonia include difficulty swallowing, neck pain, muscle weakness, injection site pain, and musculoskeletal pain. Difficulty swallowing is worth paying attention to, since the injections target neck muscles near the throat.
Blepharospasm
Blepharospasm causes involuntary, forceful closure of the eyelids that can interfere with vision and daily activities. Xeomin is approved for adults who have previously been treated with Botox for this condition, and patients can switch between the two products at the same dose without losing effectiveness.
Side effects specific to blepharospasm treatment include drooping eyelids, dry eyes, dry mouth, headache, and visual changes. These occur in about 5% or more of patients and are generally temporary.
Upper Limb Spasticity
After a stroke or brain injury, muscles in the arm and hand can become persistently tight and difficult to control. Xeomin is approved to treat this type of spasticity in adults. By relaxing the overactive muscles, it can improve range of motion and make physical therapy more productive. Common side effects include dry mouth, upper respiratory infections, and, less commonly, seizures in patients already prone to them.
Chronic Sialorrhea (Excessive Drooling)
Chronic sialorrhea is persistent, excessive drooling that often accompanies neurological conditions like Parkinson’s disease, ALS, or cerebral palsy. Xeomin treats this by targeting the salivary glands directly, reducing saliva production without completely drying out the mouth.
For adults, the standard dose is 100 units split across four injection sites: both parotid glands (the large glands near the jaw) and both submandibular glands (beneath the jaw). Treatments can be repeated no sooner than every 16 weeks. Xeomin is also approved for pediatric patients weighing at least 12 kilograms (about 26 pounds), with doses adjusted by body weight. For children, ultrasound imaging is recommended to guide precise needle placement into the glands.
The most common side effects include dry mouth, diarrhea, and elevated blood pressure, each occurring in 4% or more of patients.
How Xeomin Compares to Botox
For practical purposes, Xeomin and Botox are interchangeable at a 1:1 unit ratio. Large clinical trials confirmed that patients switching from Botox to Xeomin at the same dose experienced no loss in effectiveness. The clinical dosing ratio across the three major products is approximately 1 unit Botox to 1 unit Xeomin to 2.5 units Dysport.
The meaningful difference is in the formulation. Xeomin’s purified structure, free of complexing proteins, gives it a distinct advantage for long-term use. While antibody resistance to Botox remains uncommon at typical cosmetic doses, it becomes a more relevant concern at therapeutic doses above 200 units or with frequent, years-long treatment schedules. For someone getting occasional cosmetic touch-ups, the practical difference between the two products is minimal. For someone managing a chronic neurological condition with regular high-dose injections, Xeomin’s lower immunogenicity could matter over time.
Xeomin also doesn’t require refrigeration before it’s opened, which can make it easier for clinics to store and handle. And it generally sits at a slightly lower price point than Botox, though costs vary by provider and region.
Safety Considerations
All botulinum toxin products, including Xeomin, carry an FDA boxed warning about the possibility of the toxin spreading beyond the injection site. In rare cases, this can cause generalized muscle weakness, blurred or double vision, drooping eyelids, difficulty swallowing, changes in voice, and breathing problems. These symptoms have been reported anywhere from hours to weeks after injection. The risk is highest in children being treated for spasticity and in adults with underlying conditions that affect muscle or nerve function.
At cosmetic doses, serious complications are rare. Most side effects are mild, localized, and temporary. The risk profile increases with higher doses used for medical conditions, which is why therapeutic injections require careful monitoring and appropriate spacing between sessions.