Most people need between 10 and 30 units of Xeomin for the forehead area, depending on which specific lines are being treated and how strong the underlying muscles are. That range covers both the horizontal forehead lines (caused by the frontalis muscle) and the vertical frown lines between the eyebrows (the glabellar region), which are almost always treated together for a balanced result.
Glabellar Lines: The FDA-Approved Starting Point
Xeomin is FDA-approved specifically for moderate to severe glabellar lines, the vertical “11” lines that form between your eyebrows. The recommended dose is 20 units per session, split evenly across five injection sites: two in each of the muscles that pull your brows together (the corrugators) and one in the small muscle between them (the procerus). Each site gets 4 units.
Some providers increase this to 30 units when a patient’s muscle activity is stronger than average. This is within the product’s labeled dosing guidelines and is adjusted based on the depth of the lines and how forcefully you can furrow your brows.
Horizontal Forehead Lines
The horizontal lines that run across your forehead when you raise your eyebrows are treated separately from the glabellar area, targeting the broad, flat frontalis muscle. Providers typically use 6 to 15 units here, distributed across four to six injection points spaced evenly above the brows. The exact number depends on how wide your forehead is, how deep the lines are at rest, and how much movement you want to preserve.
This is where dosing gets more nuanced. The frontalis is the only muscle that lifts your brows. If too many units are placed here, the muscle relaxes too much and your brows can drop, creating a heavy or hooded look around the eyes. Most injectors start conservatively with the forehead and add more at a follow-up if needed, rather than risk overdoing it on the first visit.
Why Your Total May Differ From Someone Else’s
Muscle mass is the biggest variable. Men generally need significantly more units than women across the entire upper face because their facial muscles are thicker and stronger. Women typically require 30 to 50 units for a full upper-face treatment (forehead, glabella, and crow’s feet combined), while men often need 50 to 80 units for the same areas. If you’re only treating the forehead and glabella, your portion of that total will be lower, but the gender gap still applies.
Other factors that push the dose higher or lower include your age, skin thickness, how expressive you are, and whether you’ve had neurotoxin treatments before. First-time patients sometimes respond well to lower doses, while people who’ve been getting treatments for years may find their provider gradually adjusts upward.
How Xeomin Compares to Botox in Units
Xeomin and Botox use a 1:1 unit ratio. Twenty units of Xeomin produces the same clinical effect as 20 units of Botox, with a comparable side effect profile. If you’ve previously been treated with Botox and know your dose, you can expect roughly the same number of Xeomin units. The main difference between the two products is that Xeomin contains only the active toxin without the extra proteins found in Botox, which some providers believe may reduce the chance of developing resistance over time.
When Results Appear and How Long They Last
You’ll typically start noticing smoother skin within a few days, but full results take about 14 days to develop. Before-and-after comparisons on the product’s official site are photographed at that two-week mark for this reason.
The effects last around four months on average before the treated muscles gradually regain their full strength. Research tracking Xeomin specifically in the upper face found that at 120 days (about four months), 89% of participants still showed meaningful improvement in static forehead lines and 70% still showed improvement in lines during expression. By six months, nearly half still had visible reduction in resting lines, and two-thirds still showed improvement when raising their brows. So while the peak effect fades around the four-month mark, some benefit lingers well beyond that, especially with consistent treatments over time.
Avoiding a Heavy Brow
The most common cosmetic concern with forehead treatment is ending up with brows that feel heavy or look lower than before. This happens when the frontalis muscle is relaxed too aggressively while the muscles that pull the brows downward (treated in the glabellar area) aren’t balanced properly. It’s one reason the forehead and glabella are almost always treated as a pair rather than in isolation.
If you have naturally low-set brows or hooded eyelids, your provider will likely use fewer units on the forehead and place injections higher up, well above the brow line. Starting with a lower dose and returning for a touch-up two weeks later is a safer strategy than starting high. Any heaviness from over-treatment will wear off as the product fades, but that can mean a few uncomfortable weeks.
The maximum cumulative dose of Xeomin across all treatment areas in a single session is 400 units, a ceiling that’s far above what any cosmetic forehead treatment would require. For context, that limit accounts for patients who receive Xeomin for both aesthetic and medical conditions simultaneously.