How Many Units of Botox Do You Need for Your Forehead?

How many units for forehead Botox has two honest answers. The FDA label for Botox Cosmetic uses 20 units on the forehead, placed as 4 units at 5 spots, and it pairs them with 20 units between the brows for a total of 40. The typical range on my own menu for forehead lines is 10 to 20 units. Where you land depends on how strong your forehead muscle is, how big your forehead is, and how much movement you want to keep.

I'm Kat Chapman, BSN, RN, and I'm new to aesthetic injecting. I wrote this using the Botox Cosmetic label and the unit ranges I publish. Where nobody can give you a number without watching your face move, I say so.

The short version

• The label uses 20 units in the forehead, always given together with 20 units for the 11s (the frown lines between your brows). That's 40 units total.
• My menu lists 10 to 20 units for forehead lines, and 20 to 25 units for the 11s.
• Your own number gets set at your consult, after I watch you raise your brows, frown, and rest your face. I'd rather start low and add at two weeks than overshoot.

How many units for forehead Botox does the FDA label use?

The Botox Cosmetic label approves treating moderate to severe forehead lines, but only together with the 11s. The label says to treat them at the same time "to minimize the potential for brow ptosis," which means a heavy or dropped brow. Here's the forehead dose the label gives:

• 4 units into each of 5 spots in the forehead muscle (the frontalis), for 20 units.
• The spots sit on two rows. The lower row is at least 2 cm above the eyebrow.
• Another 20 units go into the 11s, for 40 units total.
• If crow's feet are treated at the same visit, the label adds 24 units there, for 64 units total.

The label also tells injectors to look at the size of the forehead and where the muscle is most active before placing those spots. So even the label expects the injector to adjust for each face.

Why my forehead range starts lower than the label

My pricing page lists 10 to 20 units for forehead lines. A few reasons a forehead might take fewer units than the label's 20:

• The forehead muscle is the one that lifts your brows. Relax it too much and the brows can feel heavy. The label's own trials reported brow drooping in 2% of people treated for forehead lines, and headache in 9%.
• Smaller foreheads and lighter movement often need less. The label's guidance to look at forehead size and muscle activity points the same way.
• I dose on the light side on purpose. Adding a few units at your two-week follow-up is easy. Taking units out isn't possible.

One thing to know: treating the forehead alone, without the 11s, is outside the FDA label. It's done in practice, and it's legal, but the dose and placement then come from clinical judgment instead of the label's trials. Ask about it at your consult if you only want the forehead done.

How much Botox for each area: my typical units vs. the label

"How much Botox" can mean dose or price. This section is about dose. For price, see my Botox cost guide.

My ranges come from my pricing page, which says they're averages from typical treatment ranges and that your exact number is confirmed at your consult. Some of them sit below the label dose. That's on purpose. I start low and adjust at two weeks.

What changes your number

• Muscle strength. A forehead that creases hard every time you raise your brows usually needs more than one that barely moves.
• Forehead size and shape. A taller or wider forehead can need more spots, which means more units.
• Brow position. If your brows already sit low or feel heavy, I'd usually go lighter on the forehead. Some people are better off with a small brow lift in the mix.
• How much movement you want to keep. Some people want a smooth forehead. Others want to still look surprised when they're surprised.
• The product. Dysport and other neurotoxins count units differently, so the number on your chart changes if you switch. I explained why in Botox vs. Dysport.

Does more units mean it lasts longer?

Maybe, up to a point. Dose is one of the things that seems to affect how long results last, along with muscle strength. I went through that research in How Long Does Botox Last the First Time? More units also means more chance of a heavy brow on the forehead, so I wouldn't push the dose up just to stretch time between visits.

How I figure out your forehead dose

I currently see patients at Canvas & Glow in Huntersville, North Carolina. Here's how I build a forehead plan:

• A free consult first. I watch your forehead, your 11s, and the corners of your eyes while you talk, raise your brows, frown, and relax. We agree on a plan before I pick up a needle.
• Medical oversight. I treat under the supervision of a medical director and follow physician-directed protocols. My medical director has 23 years of practice and about 12 years in aesthetics.
• I start light, because you can always add at two weeks.
• A complimentary two-week follow-up. By then the result has settled. If something needs adjusting, I do it at no charge. That's the Natural Results Guarantee. It's an adjustment, not a refund.

You can read more about how I treat on my Botox page. I'm open about being new to injecting on my About page. If you're nervous about the needle in general, start with Is Botox Safe for First-Timers?

What I can't tell you from a blog post

I can't tell you your number. The label dose came from trials of adults with moderate to severe lines, and in those forehead trials the response rates looked lower in people 65 and older. My own ranges are typical ranges, not a prediction for your face. And Botox may soften a line that's still there when your face is completely relaxed without erasing it. If that's you, I'll say so at the consult instead of selling you extra units.

FAQs

How many units of Botox are typical for the forehead?

The FDA label uses 20 units on the forehead, given with 20 units for the 11s. My menu lists 10 to 20 units for forehead lines. Your exact number is set at your consult.

Is 10 units of Botox enough for the forehead?

It can be for a small forehead or light lines, especially on a first visit. It may not be enough for a strong forehead muscle. That's what the two-week follow-up is for.

Can I get Botox on my forehead without treating the 11s?

People do, but it's outside the FDA label. The label pairs forehead treatment with the 11s to lower the chance of a heavy or dropped brow. Ask your injector how they'd handle it for your face.

Why do my brows feel heavy after forehead Botox?

The forehead muscle lifts your brows, so relaxing it can make them feel heavier. The label reported brow drooping in 2% of people in its forehead trials. Tell your injector at your follow-up, and get care right away for trouble swallowing, speaking, or breathing.

Do I need more units the second time?

Not necessarily. Some people need the same, some a little more or less. Your first visit and the two-week check give us a starting point for the next one.

How much Botox is a full face?

My menu lists 40 to 60 units for a full face treatment. The label's dose for forehead, 11s, and crow's feet together is 64 units. For what that costs, see my Botox cost guide.

Are Dysport units the same as Botox units?

No. Each product measures units its own way, and the labels say they can't be converted. Expect a different number if you switch.

Questions about your own forehead? Book a free consult, call or text (704) 584-9785, or see the full services menu.

Medical disclaimer: This article is general education, not medical advice or a personal treatment plan. Unit numbers and results vary from person to person. Your dose depends on your health history, medications, and an in-person exam. If you have trouble swallowing, speaking, or breathing, or vision changes or muscle weakness after any injection, get medical care right away.

Disclosure: I'm Kat Chapman, BSN, RN, and I perform the neurotoxin treatments described here. Unit ranges and practice details were checked against katchapmanrn.com on October 26, 2026.

Sources

• FDA. BOTOX Cosmetic (onabotulinumtoxinA) Prescribing Information, revised 10/2024. Sections 2.2 (forehead lines administration), 6.1 (adverse reactions), 8.5 (geriatric use), and 14.3 (forehead lines studies). https://www.accessdata.fda.gov/drugsatfda_docs/label/2024/103000s5316s5319s5323s5326s5331lbl.pdf
• Kat Chapman RN. Pricing and typical units by area. https://katchapmanrn.com/pricing