The number of Botox units you need depends on which area you’re treating, but most people use between 20 and 60 units per visit for common cosmetic concerns. The FDA-approved dose for forehead lines is 20 units, frown lines between the brows take another 20 units, and crow’s feet require about 24 units total. Those numbers are starting points. Your actual dose could be higher or lower based on your muscle strength, sex, and treatment goals.
Units by Treatment Area
Each facial area has its own typical range, and your injector will adjust within that range based on how your muscles move during your consultation. Here’s what to expect for the most common cosmetic areas:
- Forehead lines: 15 to 30 units. The manufacturer’s recommended dose is 20 units, split across five injection sites.
- Frown lines (the “11s” between your brows): 20 to 40 units. The FDA-approved starting dose is 20 units across five sites, but stronger muscles often need more.
- Crow’s feet: 12 to 24 units total (6 to 12 per side), injected at three sites around each eye.
- Jaw slimming (masseter): 40 to 60 units total, split evenly between both sides. This is an off-label use that reduces the bulk of the chewing muscles.
- Lip flip: 4 to 8 units along the upper lip border.
- Bunny lines (nose): 4 to 8 units.
If you’re treating forehead lines and frown lines together, which is standard practice because the muscles work as a unit, the combined recommended dose is 40 units. Many first-time patients treating the upper face plus crow’s feet end up in the 44 to 64 unit range total.
Why Men Typically Need More
Men generally require 1.5 to 2 times the number of units women need in the same area. The reason is straightforward: male facial muscles, particularly in the forehead and brow, are thicker and generate stronger contractions. A woman might get smooth results from 10 to 20 units on the forehead, while a man often needs 20 to 40 units for the same effect. For frown lines, men commonly need 30 to 40 units compared to the standard 20 for women. Crow’s feet can take 15 to 20 units per side in men versus 10 to 12 in women.
Men also tend to have higher hairlines and larger foreheads, which means more surface area and more injection sites. If the dose is too low for the muscle mass, the product gets metabolized too quickly, and results may fade in weeks rather than lasting months.
How Dose Affects How Long Results Last
Getting fewer units doesn’t just mean a subtler result. It can mean a dramatically shorter one. Research on frown lines shows a clear relationship: at 10 units, 83% of patients relapsed within four months, compared to only 28 to 33% of those who received 20 units or more. The standard dose of 20 units in the frown lines produces a median effect of about four months.
Higher doses extend that timeline, but with diminishing returns. In men treated for frown lines, 20 units lasted an average of 17.6 weeks, while 40 units lasted 21.7 weeks and 80 units stretched to 24.2 weeks. For women, the pattern was similar: 20 units lasted 19.7 weeks, and 40 to 80 units all clustered around 24 weeks. There appears to be a ceiling where adding more units stops adding meaningful duration.
For crow’s feet, the dose-duration curve is even more striking. In one study, 3 units per side lasted just 36 days, while 12 units lasted 120 days. Going underdosed in this area leads to quick disappointment.
What Determines Your Personal Dose
Beyond sex and treatment area, several factors push your unit count up or down. Muscle strength is the biggest variable. People with naturally strong, thick facial muscles or deep-set lines need higher doses to achieve the same relaxation as someone with finer features and lighter creasing. Your injector will often ask you to make exaggerated expressions during the consultation specifically to gauge muscle strength.
Age plays a role too, though not always in the direction you’d expect. Older patients sometimes have thinner muscles that respond to lower doses, but their lines may be deeply etched into the skin, which Botox alone can’t fully address since it relaxes muscles rather than filling in static wrinkles. Younger patients using Botox preventively often do well with lower doses because their muscles haven’t yet created permanent creases.
Treatment history matters as well. If you’ve been getting Botox consistently for years, some practitioners find that muscles weaken over time with repeated treatment, potentially allowing for slightly lower maintenance doses. First-timers, on the other hand, sometimes need a touch-up two weeks after their initial session to find the right dose.
What It Costs
Most clinics charge between $12 and $25 per unit, with the average falling around $15 to $20 depending on your city and the injector’s experience level. That means a typical upper-face treatment (forehead, frown lines, and crow’s feet at roughly 50 to 64 units) runs $600 to $1,600 per session. Jaw slimming at 40 to 60 units adds $480 to $1,500.
Some clinics advertise flat rates per area instead of per-unit pricing. Per-unit pricing is generally more transparent because you know exactly what you’re getting. If a provider charges per area, ask how many units are included so you can compare.
Units Are Not Universal Across Brands
If your provider offers Dysport instead of Botox, the unit numbers will look very different even though the effect is similar. The conversion ratio between Botox and Dysport is roughly 1:2.5 to 1:3, meaning 20 units of Botox translates to about 50 to 60 units of Dysport. Xeomin, another alternative, converts at a 1:1 ratio with Botox, so the unit counts are essentially interchangeable. These are different products with different potencies per unit, so never compare raw numbers between brands without accounting for the conversion.
One safety guardrail worth knowing: the FDA sets a maximum cumulative dose of 400 units of Botox across all treatment areas within any three-month period. For purely cosmetic use, most people land well below that ceiling.
Medical Uses Require Higher Doses
Botox for chronic migraines follows a fixed protocol of 155 units, injected across 31 sites on the head and neck every 12 weeks. For excessive underarm sweating, the standard dose is 50 units per armpit, distributed across 10 to 15 small injection points. These therapeutic doses are significantly higher than cosmetic ones and are typically covered by insurance after other treatments have been tried.