Neurotoxins

Neurotoxins in Charleston and Mt. Pleasant, SC

Four FDA-approved neurotoxins, one aim: softer lines with your expressions intact. Here is what each product is approved for, how long it lasts, and what it cannot do.

Solcara Health offers four FDA-approved neurotoxins in Charleston and Mount Pleasant: Botox Cosmetic, Xeomin, Dysport and Daxxify. Each is a form of botulinum toxin type A that relaxes the small muscles behind expression lines, so lines like the “11s” between your brows soften for a few months and then slowly return.[1][2][3][4] Labels put typical results at up to three to four months, longer for Daxxify in trials.[1][2][3][5]

These are prescription drugs, not skin-care products. They do not brighten skin, even out tone, or replace lost volume, and every one carries an FDA boxed warning about the toxin's effect spreading beyond the injection site.[1][4] So treatment here begins with a medical evaluation, and we will point you to dermal fillers or hyperpigmentation care when those fit your goal better. What we aim for is a rested face that still moves, not a frozen forehead.

Key takeaways
  • All four contain botulinum toxin type A and work the same way: they quiet the muscle under a line for months.[1][2][3][4]
  • All four are approved for frown lines; Botox Cosmetic and Xeomin also for forehead lines and crow's feet, and Botox Cosmetic for neck bands.[1][2][3][4]
  • Per the labels, Botox lasts about 3 to 4 months for frown lines, Xeomin typically up to 12 to 16 weeks, and Dysport up to four months. In two trials, Daxxify kept frown lines at none or mild for a median of about 24 weeks.[1][2][3][5]
  • The peptide in Daxxify is an inactive ingredient that keeps the toxin stable. It does not brighten skin or even out tone.[4]
  • Units are not interchangeable between brands, so 20 units of one product is not the same dose as 20 units of another.[1][2][3][4]
  • Every product carries a boxed warning about distant spread of toxin effect, so a medical history, exam and medical setting matter.[1][7]
Section 01 / How it works

How a neurotoxin softens a line, and where each is approved

Many lines on the forehead, between the brows, and around the eyes are dynamic. They form because a muscle folds the skin every time you frown, squint or raise your brows. Botulinum toxin blocks the release of acetylcholine, the chemical signal a nerve uses to tell a muscle to contract.[4] With less pull from the muscle, the skin on top creases less. Botox Cosmetic's label says the effect begins one to two days after injection and builds through the first week, and Xeomin's label puts the median onset at two to seven days.[1][2]

The effect wears off as nerves restore that signal, so treatment repeats. This also shows what a toxin cannot do. Hollows from lost volume and loose skin are not caused by muscle pull, so relaxing a muscle will not fill or lift them. For those concerns, Radiesse or skin tightening may be the better conversation, and we will say so.

FDA approval covers a specific product in a specific area. The current labels list these cosmetic uses in adults:

  • Botox Cosmetic: frown lines (glabellar lines), crow's feet (lateral canthal lines), forehead lines, and vertical neck bands (platysma bands).[1]
  • Xeomin: frown lines, horizontal forehead lines, and crow's feet, including treatment of all three in one session.[2]
  • Dysport: frown lines, in adults younger than 65.[3]
  • Daxxify: frown lines.[4]

Use in areas the labels do not list, such as a dimpled chin, is off-label, meaning the FDA has not reviewed the product for that area. The Daxxify label notes that serious reactions, some fatal, have been reported when botulinum toxins were used for unapproved purposes.[4] If you ask about one, we will say so plainly.

What a neurotoxin genuinely does

Relaxes specific facial muscles for a few months so the lines they cause soften, in areas the FDA has approved for each product, with typical durations stated on each label.

What it gets oversold for

Brightening skin or evening out tone, filling lost volume, lasting six months for every product, or comparing brands by units and price per unit as if a unit meant the same thing everywhere.

Section 02 / Four products

Botox, Xeomin, Dysport and Daxxify side by side

All four are type A botulinum toxins and share more than their advertising suggests. The real differences are how each is made, which areas are approved, and how long the effect lasted in its studies.

Labeled frown-line dose, by product Total units per treatment for glabellar lines, from each FDA label. Botox Cosmetic20 units Xeomin20 units Daxxify40 units Dysport50 units Each brand measures units its own way, so these numbers cannot be compared or converted.
More units is not a stronger dose. A unit of Dysport and a unit of Botox Cosmetic are different measures.
ProductGeneric nameFDA-approved cosmetic areasHow long it typically lasts
Botox CosmeticonabotulinumtoxinAFrown lines, crow's feet, forehead lines, neck bands[1]About 3 to 4 months for frown lines[1]
XeominincobotulinumtoxinAFrown lines, forehead lines, crow's feet[2]Up to 12 to 16 weeks, varies by person[2]
DysportabobotulinumtoxinAFrown lines, adults under 65[3]May last up to 4 months[3]
DaxxifydaxibotulinumtoxinA-lanmFrown lines[4]Median of about 24 weeks with none or mild lines in two trials[5]
Before you book

Notes worth raising at your consultation

Tap any that apply to you. This is not a screening or a diagnosis. It is a short list of things that can change the timing, product or dose, so you remember to mention them.

Some manufacturing details matter. In Xeomin, the toxin is separated from the accessory proteins that surround it in nature, leaving the 150 kDa toxin on its own.[2] Daxxify's toxin also comes without accessory proteins, and it is formulated with a 35-amino-acid peptide called RTP004. The label describes that peptide as an excipient that keeps the toxin from sticking to surfaces and helps it stay stable.[4] Dysport may contain trace amounts of cow's milk protein, so it is not used in people with that allergy.[3]

On paper, duration is where Daxxify stands out. In the SAKURA 1 and SAKURA 2 trials, 609 adults with frown lines were randomly assigned to 40 units of Daxxify or a placebo. Lines stayed at none or mild for a median of 24.0 and 23.9 weeks.[5] Those trials compared Daxxify with placebo, not other brands, and were funded by the manufacturer. A median also means half of people saw a shorter effect.

You may have read that Xeomin lasts up to six months, or that it works for people who “burn through” Botox. Its FDA label says neither: it gives a typical duration of up to 12 to 16 weeks, varying by person.[2] When a product seems to fade fast, we review dose, placement and timing before blaming the brand.

Each label also states that its units cannot be compared to or converted into units of another botulinum toxin.[1][2][3][4] The labeled doses for frown lines show why: 20 units of Botox Cosmetic, 20 units of Xeomin, 50 units of Dysport, and 40 units of Daxxify.[1][2][3][4] A bigger number is not a stronger treatment, and a lower price per unit says nothing about value on its own.

Section 03 / Video

Hear from Megan

In the short video below, Megan talks about choosing among the neurotoxins offered at Solcara and why patients often settle on a favorite. It was posted in November 2023, before this page was rewritten. Think of it as an introduction, not medical advice: the product, dose and timing that suit you come from an exam and a conversation about your goals.

Megan talks about choosing among neurotoxins. About 40 seconds, posted November 2023. General information, not medical advice; results vary.
Section 04 / Safety

Safety: the boxed warning, common side effects, and reasons to wait

Every botulinum toxin product carries an FDA boxed warning. After injection, the effect can spread beyond the treated area and cause symptoms such as general weakness, double vision, drooping eyelids, and trouble swallowing, speaking or breathing, reported from hours to weeks after treatment.[1] Swallowing and breathing problems can be life threatening, and deaths have been reported.[1] If any of these happen after a treatment, get medical care right away.[4]

Everyday side effects are usually minor and short-lived. The American Academy of Dermatology lists swelling, redness, soreness and bruising, an uncommon mild headache, and, rarely, a temporarily droopy brow or eyelid when a nearby muscle weakens.[7] In the label trials, eyelid drooping occurred in 3% of people treated with Botox Cosmetic for frown lines, and headache in 6% of people treated with Daxxify.[1][4] Most people return to normal activities right away. The AAD advises not rubbing the treated area and waiting two hours before hard exercise.[7]

Some people need extra care or should wait. The labels warn that people with nerve and muscle disorders, such as ALS or myasthenia gravis, may be at higher risk of serious effects.[1][2] Some medicines, including aminoglycoside antibiotics and muscle relaxants, can strengthen the toxin's effect.[1] Treatment is not given into an infected area or to anyone allergic to a product's ingredients.[1][3] There are no adequate data on use during pregnancy or on breast milk, so tell us if you are pregnant, planning a pregnancy, or breastfeeding.[1]

Spacing matters too. The Xeomin, Dysport and Daxxify labels say not to repeat treatment more often than every three months, and the Botox Cosmetic label notes that more frequent dosing has not been studied.[1][2][3][4] If you were treated elsewhere recently, tell us. Where you are treated matters as much as what is injected: the AAD warns that toxin bought online, or injected in a non-medical setting, can cause serious complications.[7]

Not sure which product fits, or whether you should wait? Call 843-981-0870. We will go over your health history and any past treatments, then suggest a product and dose, or tell you plainly if now is not the right time.
Section 05 / Your visit

Natural results, treatment for men, and your first visit

A natural result is mostly about dose. The AAD notes that dermatologists inject just enough to relax the targeted muscles without affecting others, which lets people keep their natural expressions.[7] That is our goal as well: softer lines with your expressions intact, with the dose matched to your muscles and your goals rather than to a set number.

Men are treated here too, and dosing may be different. In a 2005 randomized study of 80 men with frown lines, doses of 40, 60 and 80 units of Botox were consistently more effective than 20 units, and higher doses did not raise the rate of side effects.[6] The labeled Botox Cosmetic dose for frown lines is 20 units, so a higher dose is a clinical judgment, and we will explain it if we suggest one. The aim stays the same for everyone: a rested look, not a startled or frozen brow.

Your first visit starts with a pre-treatment evaluation, before anything is drawn up. Expect questions about your health, medications, supplements and past toxin treatments, and a look at how your face moves. From there we will recommend a product and a plan, or tell you if a toxin is not the right tool for what bothers you. Injections are administered by a qualified medical professional.

You can be seen at our Mount Pleasant office on Bramson Court or at The Longevity Club on Rutledge Avenue in downtown Charleston. If your goals include skin texture and quality as well as lines, we can talk through how a neurotoxin fits with microneedling, chemical peels or a daily skin care plan.

Dermal Fillers

For lost volume, which a neurotoxin does not replace. Read Dermal Fillers.

Hyperpigmentation Treatment

For dark spots and uneven tone, which no neurotoxin treats. Read Hyperpigmentation Treatment.

Skin Tightening

For loose skin that relaxing a muscle cannot lift. Read Skin Tightening.

Ask Ashley
Ashley Harwyn, PA-C Ashley Harwyn, PA-C PA-C, ABAAHP · Founder, Solcara Health Online

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Softer lines, with your expressions intact

Book an evaluation at The Longevity Club, 163 Rutledge Avenue downtown, or our Mount Pleasant office.

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About the author
Ashley Harwyn, PA-C, founder of Solcara Health in Charleston, South Carolina.

Ashley Harwyn, PA-C, ABAAHP

Founder, Solcara Health · Diplomate, American Board of Anti-Aging Health Practitioners (ABAAHP)

Ashley has practiced medicine for more than fifteen years. Her path into it began at home, with a family member born with a congenital heart defect and a childhood spent watching how much the quality of a clinician's attention could change the shape of a life. She has since practiced across a range of settings, including medical mission work in Uganda, before founding Solcara to build the kind of practice she kept wishing existed, one that treats patients as whole people and tells them the truth about what the evidence does and does not support.

Full bio →

References

FDA prescribing information for Botox Cosmetic, Xeomin, Dysport and Daxxify on DailyMed, the SAKURA 1 and 2 phase 3 trials of daxibotulinumtoxinA, a randomized dose-ranging study in men, and the American Academy of Dermatology patient FAQ, each accessed October 4, 2026.

  1. Allergan Aesthetics. BOTOX Cosmetic (onabotulinumtoxinA) for injection: Prescribing Information. DailyMed, U.S. National Library of Medicine. 2024. dailymed.nlm.nih.gov
  2. Merz North America. XEOMIN (incobotulinumtoxinA) for injection: Prescribing Information. DailyMed, U.S. National Library of Medicine. 2026. dailymed.nlm.nih.gov
  3. Galderma Laboratories. DYSPORT (abobotulinumtoxinA) for injection: Prescribing Information. DailyMed, U.S. National Library of Medicine. 2024. dailymed.nlm.nih.gov
  4. Revance Therapeutics. DAXXIFY (daxibotulinumtoxinA-lanm) for injection: Prescribing Information. DailyMed, U.S. National Library of Medicine. 2026. dailymed.nlm.nih.gov
  5. Carruthers JD, Fagien S, Joseph JH, et al. DaxibotulinumtoxinA for Injection for the Treatment of Glabellar Lines: Results from Each of Two Multicenter, Randomized, Double-Blind, Placebo-Controlled, Phase 3 Studies (SAKURA 1 and SAKURA 2). Plastic and Reconstructive Surgery. 2020. pmc.ncbi.nlm.nih.gov
  6. Carruthers A, Carruthers J. Prospective, double-blind, randomized, parallel-group, dose-ranging study of botulinum toxin type A in men with glabellar rhytids. Dermatologic Surgery. 2005. pubmed.ncbi.nlm.nih.gov
  7. American Academy of Dermatology. Botulinum toxin therapy: FAQs. American Academy of Dermatology. Accessed 2026. aad.org

Medical Disclaimer: This page is for educational and informational purposes only and does not constitute medical advice, and reading it does not create a patient-provider relationship. It describes general medical information and categories of care, not a recommendation that any individual start, stop, or change any test, treatment, or medication. Any diagnosis or treatment decision requires evaluation by a qualified, licensed clinician who knows your personal and family history. Consult a qualified healthcare provider before making medical decisions. Information reflects sources available as of October 4, 2026.

Ashley Harwyn, PA-C, ABAAHP, is a Diplomate of the American Board of Anti-Aging Health Practitioners (ABAAHP) through A4M and the founder of Solcara Health. Solcara serves South Carolina from Downtown Charleston (163 Rutledge Ave, Ste 202, The Longevity Club) and Mt. Pleasant (496 Bramson Ct, Ste 120).

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