Neurotoxin Injections 101: What They Treat and What to Expect

By Alice Tudor, APRN, CRNA · Published November 13, 2026

If you are thinking about neurotoxin injections, you probably have practical questions. What are they, exactly? Where do they go? Will you still look like yourself afterward? This guide covers the basics in plain English, so you can walk into a consultation knowing what to ask.

Short answer: neurotoxin injections are small, targeted injections of a purified botulinum toxin that temporarily relax specific muscles. Used for wrinkles, they soften the lines that form when you frown, squint or raise your brows. Results are not permanent, so most people return for repeat visits. Whether they suit you depends on your goals, your anatomy and your health history, which a provider assesses first.

Neurotoxin Injections: The Quick Answer

What they are. Prescription medicines made from botulinum toxin, injected in tiny amounts into specific muscles.
What they do. They reduce the nerve signal that tells a muscle to contract, so the muscle moves less for a while.
What they are used for. Mostly lines caused by facial movement, plus other areas such as the jawline, neck bands and underarm sweating.
How soon you notice. Many people see early change within days, with the full effect building over about two weeks.
How long they last. Typically about 3 to 4 months, then movement gradually returns.
Side effects. Mostly mild and short-lived. A rare but serious risk is that the effect spreads beyond the injection area.

What Are Neurotoxin Injections?

“Neurotoxin” is the everyday word for the family of botulinum toxin injections used in aesthetics. You will also hear them called neuromodulators, toxins, or simply “tox.” Each one is a purified protein made from botulinum toxin type A, used in very small amounts to relax a muscle on purpose. They are prescription drugs, and the FDA requires a boxed warning on them, which is why where you go and who injects matters. We cover that warning below. (Source)

The Art of Beauty lists Botox, Dysport, Daxxify, Jeuveau and Xeomin on its tox treatments page. Each is a botulinum toxin type A product and works the same basic way. For how the brands differ, see our Botox vs Dysport guide. This article stays on the bigger picture: what neurotoxin injections are, what they can do, and what the experience is like.

How Do Neurotoxin Injections Work?

A muscle moves because a nerve sends it a chemical message. The nerve ending releases a messenger called acetylcholine, and the muscle contracts. According to the FDA label for one of these products, botulinum toxin binds to the nerve ending, enters it, and blocks that release. The treated muscle then contracts less, which the label describes as a partial, localized reduction in muscle activity.

Here is why that smooths skin:

Expression lines come from repeated movement. Each time you frown or squint, the muscle underneath folds the skin. Over years, those folds can settle into lines that stay visible at rest.
A quieter muscle folds the skin less. With less movement, the skin above can look smoother.
The effect wears off. The label notes that the muscle may be reinnervated, which slowly reverses the effect.

That is why neurotoxin injections work best on dynamic lines, the ones that show up with movement. Lines from lost volume or sun damage often call for a different approach, such as dermal fillers or skin treatments.

What Can Neurotoxin Injections Treat? Common Areas at a Glance

The Art of Beauty’s tox treatments page lists the areas below as ones it commonly addresses. The table notes where an FDA cosmetic label covers the area and where it does not. A provider confirms what makes sense for you.

Area or goal	What is being relaxed	Regulatory note
Frown lines (the “11s”)	Muscles between the brows	Moderate to severe frown lines are on FDA cosmetic labels for adults
Crow’s feet	Muscle circling the eye	On the FDA cosmetic label of some products
Forehead lines	Forehead muscle	On the FDA cosmetic label of some products
Neck bands (platysma)	Vertical neck muscle bands	On the FDA cosmetic label of some products
Brow lift, bunny lines, smoker’s lines, gummy smile, downturned mouth corners	Small muscles that pull on the brow, nose, lips or mouth	Provider judgment. Not among the areas on the cosmetic labels reviewed for this article
Jawline slimming	The chewing muscle (masseter)	Provider judgment. Not among the areas on the cosmetic labels reviewed for this article
TMJ pain and teeth grinding	The chewing muscle (masseter)	Described on the practice’s site as an off-label use
Excessive sweating, chronic migraine	Sweat glands (skin) or head and neck muscles	Medical uses with their own labeling and candidacy criteria

Two takeaways. First, “not on the label” does not mean “not used.” Providers use clinical judgment beyond the formal labels, which is common in medicine, but you should hear that explained plainly. Second, approved cosmetic areas differ from product to product, which is one reason a provider recommends a product based on the area being treated.

The Most Common Cosmetic Areas, Explained

Frown lines, forehead lines and crow's feet

These “upper face” areas are the main focus of FDA cosmetic labeling. The labels describe the treated lines as moderate to severe and the use as a temporary improvement in appearance for adults. (Source)

The muscles work as a team. Frown muscles pull the brows down, and the forehead muscle lifts them. If one is relaxed without a plan for the other, the brow can sit lower than you would like. The Botox Cosmetic label itself advises treating forehead lines together with frown lines to lower the chance of a drooping brow. That is why assessment matters more than any single injection point.

Lower face, neck and jawline

Bunny lines, smoker’s lines, a gummy smile, downturned mouth corners and neck bands involve smaller, more delicate muscles near features that affect how you talk, smile and swallow, so careful dosing and placement count even more. Jawline slimming targets the masseter, the strong chewing muscle. Relaxing it may let the muscle gradually become smaller and give the jaw a more tapered look. The practice’s site notes that this develops over several weeks, not right away. Most of these uses go beyond the formal labels, so ask your provider how they approach them.

Beyond Wrinkles: Other Reasons People Get Neurotoxin Injections

Some botulinum toxin products carry medical approvals. The practice’s tox treatments page lists excessive sweating, TMJ pain and teeth grinding, and chronic migraine among the areas it addresses. As the site describes them:

Excessive sweating. Candidacy generally means sweating heavier than needed for normal temperature regulation that persists despite prescription-strength antiperspirants.
Chronic migraine. The site calls it an FDA-approved use with specific criteria, including headaches on 15 or more days a month.
TMJ pain and teeth grinding. The site calls this an off-label use, typically considered after conservative options such as a night guard.

Insurance coverage varies by condition and plan, and prior authorization is common, so check with your insurer first.

How Long Do Results Take, and How Long Do They Last?

Timing varies, so treat these as ranges, not promises.

First changes. The practice’s wrinkle treatments page says you can expect noticeable improvement within 3 to 5 days, with the full effect in about two weeks.
The wider picture. A review of the research found that onset varies widely between people and studies, from a few days to a few weeks. (Source) If you are planning around an event, book well ahead.
How long it lasts. The practice says most clients metabolize tox over about three to four months, faster or slower depending on metabolism, muscle strength and activity level. An FDA cosmetic label describes the effect on frown lines as lasting approximately 3 to 4 months.
Repeat visits. Many people rebook a few times a year. The FDA label notes that dosing more often than every 3 months has not been clinically evaluated, so do not top up early.

What the Research and FDA Labels Say

Neurotoxin injections are among the most studied aesthetic treatments, but the evidence is clearer for some areas than others.

Mechanism. The FDA label describes blocked acetylcholine release at the nerve ending, producing a partial, temporary reduction in muscle activity.
Approved cosmetic use. Several products are FDA approved for the temporary improvement of moderate to severe frown lines in adults, and some also for crow’s feet, forehead lines or neck bands.
Timing. Published timing studies use different methods, so exact day counts are rough guides.
Off-label areas. Evidence outside the formal labels is generally smaller and more mixed, and practices differ in their approach.

The FDA label also says units of one botulinum toxin product cannot be compared to or converted into units of another. That is a good reason to compare the whole treatment plan between providers, not unit numbers.

Side Effects and Downtime

Common and usually mild:

Pain, redness, swelling, tenderness or bruising at the injection sites. The FDA label associates these with the injection itself, and the practice says bruising is typically minor and lasts less than five days.
Headache. It was among the more commonly reported reactions in the forehead-line trials on the FDA label.
Eyelid or brow drooping (ptosis) if product affects a nearby muscle. The label lists it among the more common reactions in its trials and notes many reactions of this kind are transient, though some last months or longer. Tell your provider right away if you notice it.
Eye dryness. The label advises reporting eye pain, irritation, light sensitivity or vision changes.

The boxed warning: distant spread of toxin effect

Every botulinum toxin product carries an FDA boxed warning, the agency’s strongest label warning. It says the effects may spread from the injection area and cause symptoms such as generalized muscle weakness, double vision, drooping eyelids, trouble swallowing or speaking, and breathing difficulties. These have been reported hours to weeks after injection, and swallowing or breathing problems can be life threatening. The label says the risk is probably greatest in children treated for spasticity and in people with underlying conditions that predispose them.

The same label says no definitive serious reports of distant spread have been associated with dermatologic use at the labeled cosmetic doses. That is reassuring but not a guarantee. Get urgent medical care if you notice trouble swallowing or breathing, changes in your voice or speech, double or blurred vision, or widespread weakness after treatment.

Downtime. The practice says most patients return to work and their normal routine the same day, with a few precautions covered below.

Who Should Not Get Neurotoxin Injections, or Should Wait

Share your full health history before treatment. Neurotoxin injections may not be appropriate if:

You are allergic to a botulinum toxin product or its ingredients, or you have an infection at the planned injection site. Both are labeled contraindications.
You are pregnant, planning pregnancy or breastfeeding. The labels say the available human data are not enough to judge the risk, and the practice lists it as a reason not to treat.
You have a nerve or muscle condition such as ALS, myasthenia gravis or Lambert-Eaton syndrome. The FDA label says these patients should be monitored, and the practice lists neuromuscular conditions as a reason it may not be recommended.
You have swallowing or breathing problems, or weakness in the area to be treated, such as trouble raising your brows.
You take certain medicines such as aminoglycoside antibiotics or muscle relaxants, which the label says can strengthen the effect. Tell your provider about everything you take.

Not being a candidate for one treatment never closes the door on every option. A good consultation covers what else might work.

What to Expect at Your Appointment

Every practice runs a little differently. Here is what The Art of Beauty’s service pages describe.

Before you come. The practice suggests avoiding blood thinners if possible, coming makeup-free, skipping alcohol for 24 hours, and minimizing aspirin, ibuprofen and Tylenol. Check with your own doctor before changing any medicine you take for a medical reason.
Assessment. The practice says every treatment starts with an individual look at your muscle movement, facial structure and goals. Expect to be asked to frown, raise your brows and smile.
The injections. The practice says treatment takes about 30 to 45 minutes, and you may feel a slight pinch. The number of injection sites depends on the area and your muscle strength, and your provider explains the plan.
Right after. The practice advises staying upright for about four hours, skipping strenuous exercise that day, and not rubbing or massaging the area, since pressure may move product to unintended muscles.
The next two weeks. Results build over several days to about two weeks. If something looks uneven or worries you, call your provider. Aftercare is on the procedure instructions page.

Neurotoxin Injections at The Art of Beauty

The Art of Beauty is a nurse-led medical aesthetics practice at 900 N Franklin St, Suite 407, in Chicago’s Gold Coast. It offers neurotoxin injections with Botox, Dysport, Daxxify, Jeuveau and Xeomin, and states that every treatment starts with an individual assessment of your muscle movement, facial structure and goals. The goal it describes is natural movement with smoother skin.

To learn more, see our tox treatments and wrinkle treatments pages, read our Botox vs Dysport guide if you are comparing products, or browse the FAQ and financing options. Not sure where to begin? That is what a consultation is for. The practice describes it as free, with no pressure and no commitment.

Frequently Asked Questions

What is the difference between a neurotoxin and a neuromodulator?

In everyday use they mean the same thing: botulinum toxin injections that temporarily relax muscles. “Neuromodulator” is the softer term many practices prefer, and “neurotoxin” is the common search term. Both describe products like Botox, Dysport, Daxxify, Jeuveau and Xeomin.

Do neurotoxin injections hurt?

Most people describe a quick pinch at each injection site, and the practice says the procedure is generally well tolerated. Pain tolerance varies, so tell your provider if needles make you anxious. The treatment itself takes about 30 to 45 minutes.

Will I look frozen?

That look usually comes from too much product or poor placement. The practice says its goal is natural movement with smoother skin, with each face assessed individually. Ask your provider how they plan to preserve your expression.

How long do neurotoxin injections last?

The practice says most clients see results for about three to four months, depending on metabolism, muscle strength and activity level. The effect fades gradually as movement returns, and many people schedule repeat visits a few times a year.

When will I see results?

The practice says noticeable improvement usually comes within about 3 to 5 days, with the full effect in about two weeks. Research shows a wide range between people, so plan important events well ahead.

What is preventive tox?

The practice describes it as treatment aimed at keeping new lines from forming. There is no single right age to start, and the research on prevention is less settled than on softening existing lines. It is best discussed with a provider who has seen how your face moves.

Are neurotoxin injections safe?

When given by a trained provider to a suitable candidate, most side effects are mild and temporary, but no medical treatment is risk free. Every product carries an FDA boxed warning about spread beyond the injection area, so know the warning signs and seek urgent care if they appear.

Will insurance cover neurotoxin injections?

Cosmetic treatment is generally not covered. For medical uses such as chronic migraine or severe underarm sweating, coverage varies by plan and usually requires documentation and prior authorization. Check with your insurer before you book.

This article is for general informational purposes only and does not constitute medical advice. Every person’s skin, health history and goals are different, and results vary. If you have questions about your own situation, please speak with a qualified, licensed healthcare provider directly.

About the Author

Alice Tudor, APRN, CRNA, founder of The Art of Beauty

Alice Tudor is an Advanced Practice Registered Nurse (APRN) and Certified Registered Nurse Anesthetist (CRNA) with more than 15 years of clinical experience. She earned her MSN in Anesthesia from Union University in 2013, then founded The Art of Beauty, a nurse-led medical aesthetics practice in Chicago’s Gold Coast.