A full Botox treatment covering the forehead and the eye area typically requires 44 to 64 units total, though the exact number depends on your muscle strength, gender, and how deep your lines are. That range covers three distinct zones: horizontal forehead lines, the vertical frown lines between your brows (often called “the 11s”), and crow’s feet at the outer corners of your eyes. Each zone has its own standard dosage, and most practitioners treat them together for a balanced result.
Units for Horizontal Forehead Lines
The forehead muscle that raises your eyebrows is a broad, flat sheet running from your brows to your hairline. The FDA-approved dose for this area is 20 units, split evenly across five injection sites (4 units each). In practice, many providers use anywhere from 10 to 30 units depending on how strong your muscle contractions are and how prominent the lines have become at rest.
This is one area where more is not better. Overtreating the forehead can make your brows drop, creating a heavy or hooded look over the eyelids. That’s why experienced injectors almost always treat the forehead alongside the frown lines between your brows. Relaxing only the forehead without balancing the muscles below it is one of the most common causes of that “tired eyes” look people worry about.
Units for Frown Lines (The 11s)
The vertical creases between your eyebrows are produced by a set of smaller, stronger muscles that pull your brows inward and downward. The FDA-approved dose here is also 20 units, distributed across five injection points. The manufacturer specifically recommends treating this area whenever you treat the forehead, bringing the combined total for forehead plus frown lines to 40 units.
Because these muscles are compact and powerful, some people need the full 20 units even if their forehead required fewer. Undertreating the frown lines while fully treating the forehead is what leads to an unbalanced look, so your provider will typically dial in both areas together.
Units for Crow’s Feet
Crow’s feet form in the thin, circular muscle that surrounds each eye. The FDA-approved dose is 12 units per side (three injection points of 4 units each), totaling 24 units for both eyes. In clinical practice, many providers use 10 to 20 units per side, so total doses for both eyes range from 20 to 40 units.
The skin around the eyes is thinner and more delicate than the forehead, which is why the starting dose tends to be conservative. If 12 units per side doesn’t fully smooth the lines, your provider can add a few units at a follow-up visit rather than risk over-relaxing the area on the first try.
Why Men Typically Need More Units
Men’s facial muscles, particularly in the upper face, are thicker and generate stronger contractions than women’s. Clinical experience suggests men often need 1.5 to 2 times the number of units used for women in the same areas. A woman might receive 10 to 20 units in the forehead, while a man could need 20 to 40 units for equivalent smoothing. The same pattern holds for frown lines (30 to 40 units for men versus 20 for women) and crow’s feet (15 to 20 units per side for men versus 10 to 12 for women).
This means a man treating all three zones could realistically need 80 to 100 units total, compared to 44 to 64 for most women. If you’re a man getting Botox for the first time and a provider quotes you the same units they’d use on a woman, it’s worth asking whether the dose accounts for muscle mass differences.
What the Total Costs Look Like
Botox is priced per unit, and the going rate is roughly $15 to $20 per unit. For a three-area treatment using 45 to 75 units, expect to pay somewhere between $700 and $1,200 per session. At $15 per unit, a standard 64-unit treatment (20 forehead, 20 frown, 24 crow’s feet) would run about $960.
Since results last three to six months, most people schedule maintenance appointments every 12 to 16 weeks. High-movement areas like the crow’s feet tend to wear off faster, sometimes closer to the three-month mark, while the forehead may hold closer to four months. Over time, some people find they can stretch their appointments further as the muscles gradually weaken from repeated treatment.
When Results Appear and How Long They Last
You won’t see changes immediately after your appointment. The muscle-relaxing effect starts around days three to four, and full results typically settle in by day 14. The peak satisfaction window runs from about two weeks to three months after injection. After that, movement gradually returns as the effect wears off, and lines reappear fully by about six months in most people.
Risks of Getting Too Many Units
The most common cosmetic complication from forehead Botox is brow drooping. This can show up in a few ways depending on where the imbalance occurs.
- Heavy or hooded eyelids: Over-relaxing the forehead while undertreating the frown lines lets the muscles between your brows overpower the weakened forehead muscle, pulling the inner brow downward.
- Sad or tired appearance: If the outer portions of the forehead are over-treated, the tail of the brow drops, creating a hooded look at the outer eyelid and sometimes making it harder to apply eye makeup normally.
- “Spock brow”: The opposite problem. If the center of the forehead is treated but the outer edges are missed, the untreated outer muscle pulls the brow tails sharply upward, creating a pointed, exaggerated arch.
All of these issues are temporary and resolve as the Botox wears off over a few months. But they’re a good reason to choose an experienced injector who treats the forehead and frown lines as a connected system rather than isolated zones. The goal is balanced relaxation across the upper face, not maximum paralysis in one spot.