Botox unit calculation forms the foundation of a successful botulinum toxin treatment. Since each facial area has a different muscle structure and thickness, optimal dosing must be determined individually based on the treatment area, the patient's muscle strength, and the desired outcome.
Botox Units and Measurement
Botulinum toxin doses are expressed in units (U). Units from different brands are not interchangeable. Botox (onabotulinumtoxinA) and Xeomin (incobotulinumtoxinA) are used on a 1:1 basis, while Dysport (abobotulinumtoxinA) requires approximately 2.5–3 times higher doses to achieve an equivalent effect.
Forehead Area (Frontalis Muscle)
The standard dose for the forehead area ranges from 10 to 30 units of Botox. Injections are typically distributed across 4–8 points, beginning approximately 2 cm above the brow line. Lower doses are preferred for women (10–20 units), while higher doses are used for men (20–30 units).
The most important consideration in forehead Botox is the risk of brow ptosis (brow drooping). For this reason, the dose and injection points must be carefully planned so as not to completely eliminate the brow-elevating function of the frontalis muscle.
Glabella (Between the Brows)
The glabellar area encompasses the corrugator supercilii and procerus muscles. The standard dose is 20–25 units of Botox, typically administered at 5 injection points (1 procerus + 2×2 corrugator). In male patients with deep glabellar furrows, the dose may be increased to 30 units.
Crow's Feet (Lateral Canthal Lines)
The crow's feet area is treated with injections into the lateral portion of the orbicularis oculi muscle. For each side, 8–16 units of Botox are distributed across 3–4 injection points, giving a total of 16–32 units for both sides. Injections should be placed lateral to, not over, the orbital rim.
- Forehead: 10–30 units (4–8 points)
- Glabella: 20–25 units (5 points)
- Crow's feet: 8–16 units per side (3–4 points)
- Bunny lines: 4–8 units (2 points)
- Masseter: 25–50 units per side
Individual Dose Adjustment
The doses listed above serve as general guidance only. For individual dose adjustment, the patient's muscle mass, wrinkle depth, prior Botox experience, age, and desired outcome should all be carefully evaluated. Starting with a conservative dose at the first session and administering a supplementary dose at the 2-week follow-up if needed is a safe and well-established approach.
For personalised dosing and pricing, please contact us for a consultation.
This article is for informational purposes only. Please consult a qualified physician for treatment decisions.