Originally published: April 2025. Last updated: September 2026.
The approved dose for forehead lines is 20 Units, given as 4 Units into each of five points across the frontalis muscle. There’s a catch that most pages leave out: forehead lines are only approved for treatment alongside the frown lines between your brows, which take another 20 Units. So the realistic answer for a forehead appointment is 40 Units.
That pairing isn’t an upsell. It’s anatomy, and treating the forehead without it is how people end up with heavy brows. Below is where those numbers come from, what moves them up or down for your face, and what the days after your appointment should look like. For treatment itself, see our Botox and dermal fillers in Midtown Manhattan.
Key Takeaways
- 20 Units for the forehead, across five injection points in the frontalis.
- Plus 20 Units for the frown lines, because the label approves forehead treatment only in conjunction with them.
- 24 Units for crow’s feet, if you’re adding that area.
- Units don’t transfer between products. A Botox unit and a Dysport unit are not the same quantity.
- Three to four months of effect, and no repeat dosing sooner than three months.
- Skip facials for 24 hours and skip the gym for the rest of the day.
On This Page:
- The Approved Doses by Area
- Why the Forehead Is Never Treated Alone
- What Changes Your Number
- Why Units Don’t Transfer Between Products
- What Botox Is Made Of
- Where Else It Gets Used
- How Long It Lasts
- What Not to Do Afterwards
- Botox or Fillers?
- Risks and Who Should Skip It
- Frequently Asked Questions
- What to Do Next
- Sources
The Approved Doses by Area
Dosing for Botox Cosmetic isn’t a matter of opinion. The prescribing information specifies exactly how much goes where, and a good injector starts from that and adjusts.
| Area | Total dose | How it’s placed |
|---|---|---|
| Forehead lines (frontalis) | 20 Units | 4 Units into each of 5 sites |
| Frown lines, the “11s” (glabellar) | 20 Units | 4 Units into each of 5 sites, two per corrugator and one in the procerus |
| Crow’s feet (lateral canthal) | 24 Units | 4 Units into 3 sites per side, 6 points in total |
| Forehead and frown lines together | 40 Units | 10 injection points across both areas |
| Upper face, all three areas | 64 Units | 16 injection points |
Those totals are the reference point for any quote you’re given. If someone offers to do your forehead for 8 Units, they are not following the label, and the result will fade quickly enough that you’ll be back sooner than you planned.
Why the Forehead Is Never Treated Alone
The frontalis is the only muscle that lifts your eyebrows. Everything else around the brow pulls down, including the corrugators and procerus that create the frown lines.
Relax the frontalis on its own and you’ve removed the lift while leaving the depressors at full strength. The brow settles lower, the upper lid looks heavier, and people describe feeling tired-looking rather than smoother. Treating both groups keeps the balance, which is why the label approves forehead lines specifically in conjunction with glabellar lines rather than by themselves.
It also explains something patients notice and rarely get told: a light forehead dose with untreated frown lines tends to age the upper face. The fix isn’t less product in the forehead. It’s treating the pair.
What Changes Your Number
The label gives the starting framework. Within it, several things push an individual dose up or down.
- Muscle strength. A strong frontalis needs more to quiet it, and strength varies more between people than line depth does.
- How expressive you are. Faces that move a lot rebuild movement faster.
- Line depth and whether they’re static. Lines still visible at rest have a skin component that a neuromodulator can soften but not erase.
- Sex. Men generally have greater muscle mass in the forehead and typically need more.
- What you want. Fully smooth and still-mobile are different targets, and they’re different doses.
- Your history with it. People treated consistently over years often find the muscle needs less than it used to.
Worth saying plainly: deep creases that sit in your skin when your face is completely relaxed won’t disappear with any dose. Those have a structural element, and chasing them with more units produces a frozen forehead and the same line. That’s the point where a filler or a skin treatment does more than another vial.
Why Units Don’t Transfer Between Products
This one costs people money. Botox, Dysport and Xeomin are all botulinum toxin type A, and all three are measured in units, which makes the units look comparable. They aren’t.
The prescribing information is blunt about it: “Units of biological activity of BOTOX Cosmetic cannot be compared to nor converted into Units of any other botulinum toxin products.” Each manufacturer measures potency with its own assay. A 50-unit quote from one product and a 50-unit quote from another describe different amounts of biological activity, so comparing the per-unit price between them tells you nothing.
What’s worth comparing is the dose for your area with the product you’re actually getting. We offer Dysport and Xeomin alongside Botox, and each has situations where it’s the better pick. Onset, spread and how each behaves in a particular muscle differ enough to matter.
What Botox Is Made Of
Botox Cosmetic is a purified botulinum toxin type A, produced by fermenting the Hall strain of Clostridium botulinum. Besides the toxin itself, a vial contains human albumin and sodium chloride. That’s the complete formulation.
It ships as a vacuum-dried powder and gets reconstituted with sterile saline just before your appointment. A 100-unit vial holds 0.5 mg of albumin and 0.9 mg of sodium chloride alongside the active ingredient, which gives a sense of how small the working quantities are.
The word toxin does a lot of unhelpful work here. In the doses used for wrinkles, the molecule stays where it’s placed and does one thing: it blocks the release of acetylcholine, the signal a nerve uses to tell a muscle to contract. No signal, no contraction, and the skin above stops folding. Nerves and muscles aren’t damaged, which is precisely why the effect wears off.
Where Else It Gets Used
Three cosmetic areas carry FDA approval for Botox Cosmetic: glabellar lines, lateral canthal lines and forehead lines. Plenty of other uses are well established off-label, meaning an experienced injector uses them routinely but they sit outside the approved indications.
| Approved cosmetic areas | Common off-label cosmetic uses |
|---|---|
| Frown lines between the brows | Bunny lines on the nose |
| Crow’s feet | A gummy smile |
| Horizontal forehead lines | Neck bands and vertical lip lines |
| Jaw slimming and chin dimpling |
Separately, botulinum toxin has a long medical history that predates the cosmetic approval, covering conditions such as excessive sweating, chronic migraine and muscle spasm. Those are prescribed and dosed differently, and they’re a physician conversation rather than an aesthetic one.
Not every line responds. Wrinkles driven by muscle movement do. Folds caused by lost volume or loose skin need something else, and the lines and wrinkles page covers what suits which.
How Long It Lasts
Expect three to four months. The prescribing information puts the duration of effect for glabellar lines at approximately that range, and the forehead behaves similarly.
The timeline within a cycle is fairly consistent:
- Days 3 to 5. Movement starts softening and you’ll notice the change.
- Around day 14. Full effect. Judge your result here, not on day four.
- Months 3 to 4. Movement gradually returns as the nerve endings re-establish signalling.
If you’re planning around an event, book at least two weeks ahead so there’s room to assess and, if needed, adjust.
One limit is worth knowing before you book a top-up: dosing more frequently than every three months has not been clinically evaluated. A practice willing to re-treat you at six weeks is going beyond what the evidence covers.
What Not to Do Afterwards
The product needs a few hours to bind to the nerve endings where it was placed. Almost every aftercare rule exists to keep it from migrating during that window, because product that drifts into a neighbouring muscle is what produces a dropped brow or a heavy eyelid.
| Avoid | For how long | Why |
|---|---|---|
| Rubbing or massaging the area | 4 hours minimum | Physical pressure can move product before it binds |
| Lying flat | 4 hours | Keeps product at the injection sites |
| Strenuous exercise | Rest of the day | Raised blood flow and facial movement together |
| Facials, microneedling, peels | At least 24 hours, ideally several days | Sustained pressure, massage and heat on the treated area |
| Saunas, steam rooms, hot yoga | 24 hours | Heat and vasodilation on freshly treated tissue |
| Facial rollers and gua sha | Several days | Same mechanism as massage, often applied harder |
Facials come up more than anything else on this list, usually because someone has both booked in the same week. The order matters: have the facial first, then the injections. Reversed, you’re either waiting or risking the result you paid for.
Mild redness, small raised bumps at the injection points and occasional bruising are normal and settle within a day or two. Makeup over the area is fine once the bumps have gone down, applied gently.
Botox or Fillers?
People use the words interchangeably and they’re entirely different products doing different jobs.
| Botox and other neuromodulators | Dermal fillers | |
|---|---|---|
| What it does | Relaxes the muscle creasing the skin | Adds volume under the skin |
| Best for | Lines from movement: forehead, frown lines, crow’s feet | Lost volume and static folds: cheeks, lips, nasolabial folds, jawline |
| When you see it | 3 to 5 days, full at about 2 weeks | Immediately, once swelling settles |
| Duration | 3 to 4 months | Varies widely by product and area |
| Upper third of the face | Usually the right tool | Rarely first choice |
| Mid and lower face volume | Limited role | Usually the right tool |
A useful test: make the expression that produces the line. If the line appears with the movement and softens when your face relaxes, a neuromodulator is the answer. If it’s there regardless, you’re looking at volume or skin quality, and filler or a collagen-stimulating treatment fits better.
Using them together
Combining them is common, because most faces age in both ways at once. A typical plan quiets movement in the upper third and restores volume through the mid-face, which is why results from the two together often look more natural than a heavy dose of either alone.
Sequencing is a practical detail worth asking about. Some injectors treat both in one visit, others place filler first and assess movement afterwards. Either approach is reasonable; what matters is that someone is planning the face as a whole rather than chasing one line at a time.
Risks and Who Should Skip It
Botulinum toxin products carry a boxed warning for distant spread of toxin effect. The effects can extend beyond the injection site and produce swallowing and breathing difficulties, which can be life-threatening, and symptoms may appear anywhere from hours to weeks after treatment. Cases at cosmetic doses are rare, and the warning is on the label for good reason.
Treatment is contraindicated if you have a known hypersensitivity to botulinum toxin or any component of the formulation, or an infection at the proposed injection site. Pregnancy and breastfeeding, and neuromuscular conditions such as myasthenia gravis or ALS, need a physician conversation before anything is booked.
Common short-term effects are the ones already covered: local redness, small bumps, bruising and occasional headache. Brow or eyelid droop is the one people fear, it’s uncommon, it comes from product reaching a muscle it wasn’t meant to, and it resolves on its own as the effect wears off.
Tell your injector about any recent botulinum toxin treatment elsewhere, including medical use, since doses accumulate and the three-month spacing applies across all of it.
Frequently Asked Questions
How many units of Botox do I need for my forehead?
The approved dose is 20 Units, injected as 4 Units into each of 5 sites in the frontalis muscle. Forehead lines are approved for treatment only alongside the frown lines between the brows, which take another 20 Units, so a forehead appointment usually means 40 Units in total. Your injector may adjust within that framework.
What is Botox made of?
Botox Cosmetic is a purified botulinum toxin type A, produced by fermenting the Hall strain of Clostridium botulinum. The vial also contains human albumin and sodium chloride and nothing else. It arrives as a vacuum-dried powder and is reconstituted with sterile saline immediately before your appointment.
How long after Botox can you get a facial?
Wait at least 24 hours, and several days is better. A facial means sustained pressure, massage and heat on exactly the area that was injected, any of which can move product before it has bound to the nerve endings. Avoid touching or rubbing the area for the first four hours as well.
How long does Botox last in the forehead?
The duration of effect for glabellar lines is approximately three to four months according to the prescribing information. Results start showing at around three to five days and finish developing near the two-week mark. Repeat dosing more often than every three months has not been clinically evaluated.
What is the difference between Botox and fillers?
Botox relaxes the muscle that creases the skin, so it treats lines caused by movement. Fillers add volume beneath the skin, so they treat lines and hollows caused by lost fat and collagen. One quiets motion, the other replaces structure. Many people need both, in different parts of the face.
Are Botox, Dysport and Xeomin units the same?
No. The prescribing information states that Units of Botox Cosmetic cannot be compared to or converted into Units of any other botulinum toxin product. A Dysport dose expressed in units is a different quantity of biological activity. Comparing a per-unit price between two different products tells you nothing useful.
What to Do Next
Your dose comes down to how strong your frontalis is and how much movement you want to keep, and both are quicker to assess in person than to estimate from a page. You can request a consultation or read more about our injectable treatments.
Individual results vary. This article is general information, not medical advice or a diagnosis, and it doesn’t replace the prescribing information or a consultation with a qualified injector.
Sources
- Allergan. BOTOX Cosmetic (onabotulinumtoxinA) for injection, full prescribing information. Dosage and administration, description, warnings and contraindications. Read the label on DailyMed
- U.S. Food and Drug Administration. BOTOX Cosmetic approval documents and labelling, BLA 103000. View the FDA label (PDF)
