Botox for frown lines takes 20 units on the FDA label, placed at five points between the brows, and it is the original approved use of Botox Cosmetic. The two vertical creases people call 11 lines are known on the label as glabellar lines, and they have been treatable with Botox Cosmetic since April 2002. More than two decades of use means the dosing here is better defined than for any other cosmetic area. Here is the unit map, what it costs, what the treatment does to your expression, and what to do if it has not worked for you before.
Updated October 5, 2026 by the Esthetica Medspa clinical team.
The essentials
- Frown lines, 11 lines and glabellar lines are three names for the same thing: the vertical creases between the eyebrows.
- Botox Cosmetic received its first FDA approval for moderate to severe glabellar lines on April 12, 2002.
- The labeled dose is 20 units: 4 units at each of 5 points, two in each corrugator muscle and one in the procerus.
- This is the zone most often treated first, and treating it protects against brow heaviness when the forehead is treated too.
- Botox for frown lines is a named service at all seven Esthetica Medspa locations.
What are 11 lines, and why do they form?
The 11 lines are the two vertical creases that appear between the eyebrows when you frown, concentrate or squint into the sun. They are produced by the glabellar complex: the two corrugator muscles, which pull the brows inward, and the procerus, which pulls the brow area down. Repeated contraction folds the skin in the same place thousands of times, and eventually the crease stays when the muscle relaxes.
They tend to show up earlier on people who squint a lot, work at screens without correct glasses, or spend time outdoors without sunglasses. That is useful to know, because fixing the trigger reduces how fast the lines come back between treatments.
How many units of Botox for frown lines?
The FDA label specifies 20 units in total, delivered as 4 units at each of five injection points: two in each corrugator muscle and one in the procerus. That five-point pattern is the reference map every injector learns.
| Muscle | Injection points | Units per point | Subtotal |
|---|---|---|---|
| Corrugator, right | 2 | 4 units | 8 units |
| Corrugator, left | 2 | 4 units | 8 units |
| Procerus | 1 | 4 units | 4 units |
| Labeled total for glabellar lines | 20 units | ||
Source: Botox Cosmetic dosage guide, reflecting FDA prescribing information, read October 5, 2026.
Real-world doses move around that baseline. Strong corrugators, which are more common in men, often need more than 20 units to hold for a full cycle. A first-time patient with mild lines may be mapped at less. Our guide to Botox units by area compares this zone with the forehead, eye area and neck so you can see where your total is coming from.
Why are frown lines usually the first area treated?
Two reasons. First, the glabella is where most people notice the change they want: softening the vertical creases makes a face look less tense without touching expression anywhere else. Second, treating the glabella is what makes forehead treatment safe.
The frontalis muscle is the only one that lifts the brow, and the corrugators and procerus pull it down. Weaken the lifter without reducing the pullers and the brow sits lower. That is why the FDA label for forehead lines specifies treating them together with glabellar lines, for a 40-unit total. If you are planning both, the glabella is not an upsell; it is the counterweight.
How much does Botox for frown lines cost?
Most United States practices price per unit, so a labeled 20-unit glabellar treatment costs 20 times the per-unit price. Some price by treatment area instead, which can be better value or worse depending on how many units their “area” includes, so ask for the unit count behind any area price before comparing quotes.
Two things change the real cost. If you need more than 20 units to hold results for a full cycle, your per-visit cost goes up. And if you are treating the forehead at the same time, the labeled plan doubles the product. Neuromodulators now make up about 50% of all minimally invasive cosmetic procedures in the United States according to the ASPS 2025 statistics report, which is why unit pricing has become fairly transparent. Our 2026 Botox cost guide breaks down per-unit and per-area pricing in detail.
What does the appointment involve, and what is recovery like?
It is quick. Your injector will ask you to frown hard so they can feel where the corrugators sit and how strong they are, then place five small injections with a fine needle. Most people compare it to five quick pinches and go straight back to their day.
Expect small bumps for 15 to 30 minutes and occasionally a small bruise. Aftercare is the same protocol as every other area: stay upright for roughly four hours, skip the gym, saunas and facials for 24 hours, and do not rub or massage the area. Our Botox aftercare guide covers the first 48 hours in order.
Onset is gradual. Softening usually begins at 3 to 7 days and the full effect is in place around day 14. Anything that looks slightly uneven at day 4 is usually just the product settling at different rates, and a two-week review is the right moment to assess and touch up if needed.
How long does it last, and what if it stops working?
Plan on three to four months. The glabella tends to sit at the shorter end for people with strong muscles, which is one reason men frequently need higher doses and slightly more frequent treatment. Our page on how long Botox lasts and what shortens it covers the factors you can influence.
If results have become weaker over time, there are a few ordinary explanations before anyone reaches for the word resistance. The dose may be too low for your muscle, the product may have been over-diluted, injection placement may be missing the strongest part of the muscle, or you may simply be coming back later than the effect lasts and remembering the good weeks. Switching product is sometimes discussed, and our comparison of Letybo and Botox explains how the newer options differ. Genuine antibody-mediated resistance exists but is uncommon, and it is a diagnosis to reach last rather than first.
Will it make my expression look frozen?
At labeled doses in this zone, the usual outcome is that you can still raise your brows and still look surprised, but the hard vertical crease between them softens. A frozen look generally comes from treating several areas at high doses at once, not from 20 units in the glabella.
If a natural result matters to you, say so plainly at the consultation and ask for a conservative first dose with a two-week review. It costs you one extra visit and it tells your injector exactly how your muscles respond. Our guidance on choosing between a nurse practitioner and a physician injector explains what to look for in credentials and oversight.
How does the glabella compare with the other treatment areas?
The glabella is the smallest labeled dose of the four approved cosmetic areas, and the most commonly treated. Seeing the four side by side makes it easier to understand a quote, because a provider talking about “two areas” could mean 44 units or 60 depending on which two.
| Area (label name) | Common name | Labeled total | Injection points |
|---|---|---|---|
| Glabellar lines | Frown lines, 11 lines | 20 units | 5 |
| Lateral canthal lines | Crow’s feet | 24 units | 3 per side |
| Forehead lines, with glabella | Forehead wrinkles | 40 units | 5 plus 5 |
| Platysma bands | Neck bands | 26, 31 or 36 units | Jawline plus band points |
Source: Botox Cosmetic dosage guide, read October 5, 2026. Ask any provider to quote in units, not in vague areas, and the comparison becomes straightforward.
Who should not have frown line Botox?
It is not suitable during pregnancy or breastfeeding, for people with neuromuscular disorders such as myasthenia gravis or ALS, with an active skin infection at the site, or with a previous reaction to a botulinum toxin product. Share your full medication list, because some drugs interact with botulinum toxins.
There is also a case where the answer is simply no for now: very deep static creases in thin, sun-damaged skin, where the patient expects them to disappear. The muscle will relax, and the crease will soften over several cycles, but the skin needs separate work. Saying that clearly before treatment is better than hoping it goes unnoticed afterwards.
Where can you have this treated at Esthetica?
Botox for frown lines is a named service at all seven Esthetica Medspa locations, including Esthetica Medspa San Antonio. Running the same protocols across seven markets means the five-point map, the conservative first dose and the two-week review are the same wherever you see us. You can review the full treatment overview on our Botox service page.
Frequently asked questions
How many units of Botox for 11 lines?
The FDA label specifies 20 units: 4 units at each of five points between the brows. Strong muscles, which are more common in men, often need more to hold for a full cycle.
Are frown lines and glabellar lines the same thing?
Yes. Frown lines, 11 lines and glabellar lines all describe the vertical creases between the eyebrows. Glabellar lines is the term used on the FDA label.
Can I treat my frown lines without treating my forehead?
Yes, and many people do. The reverse is the problem: treating the forehead without the glabella can leave the brow heavy, which is why the label pairs them.
How soon will my 11 lines soften?
Most people see change at 3 to 7 days and the full result at about two weeks. Assess at day 14 rather than earlier.
Why does my Botox not last as long as it used to?
Usually the dose, the dilution, the placement or the interval between visits, in that order. True resistance to botulinum toxin exists but is uncommon, and it is worth ruling out the ordinary causes first.
Will 20 units make me look frozen?
At labeled doses in this one area, that is unlikely. A frozen appearance typically comes from high doses across several areas at once. Ask for a conservative first dose if a natural result matters to you.
Sources
- Botox Cosmetic dosage guide, reflecting FDA prescribing information, read October 5, 2026.
- Botox Cosmetic FDA approval history, read October 5, 2026.
- ASPS 2025 procedural statistics summary: neuromodulators represent 50% of all minimally invasive procedures.
This article is general information, not medical advice. Treatment suitability is assessed in person by a licensed provider. Individual results vary.
