Botox vs. Dysport: Differences in Onset, Duration, Dosing, and Cost (2026 Guide)

If you are choosing between Botox and Dysport to soften frown lines, forehead creases, or crow’s feet, the differences are real but more nuanced than the marketing suggests. Both are FDA-approved type A botulinum toxins. Both quiet the same muscles. Both last roughly the same length of time for most patients. Where they diverge — onset speed, how they diffuse through tissue, unit conversion, and per-unit price — can absolutely affect which one is the better fit for your face and your goals.

This guide walks through every meaningful difference between Botox and Dysport based on the current FDA labels, the head-to-head clinical literature, and what we see day-to-day in our Chatsworth and Santa Barbara clinics. By the end you will know which product tends to work better for which area, what to expect on the day of treatment, and how to talk to your injector about the right choice for you.

What Botox and Dysport Actually Are

Both products are purified type A botulinum toxin. Both work by temporarily blocking the chemical signal — acetylcholine — that tells targeted facial muscles to contract. When the muscle relaxes, the overlying skin smooths and the dynamic wrinkle softens.

Where they differ chemically is in the surrounding protein complex and the manufacturing process:

• Botox (onabotulinumtoxinA) — made by Allergan Aesthetics (an AbbVie company), FDA-approved for cosmetic glabellar lines in 2002 and for forehead lines and crow’s feet in subsequent years. It uses a roughly 900 kDa neurotoxin complex.
• Dysport (abobotulinumtoxinA) — made by Galderma, FDA-approved cosmetically for glabellar lines in April 2009. It uses a smaller, less aggregated complex (roughly 500–900 kDa with a higher proportion of free 150 kDa toxin), which is part of why it tends to diffuse a bit more.

That diffusion difference is small in absolute terms, but it is the single most consequential clinical distinction between the two.

Onset: How Quickly Will You See Results?

This is the difference patients notice first.

• Dysport onset: Most patients see softening at 2–3 days, with peak effect at roughly 10–14 days.
• Botox onset: Most patients see softening at 3–7 days, with peak effect also around 10–14 days.

For a wedding, a photo shoot, or a high-stakes meeting next week, that 1–4 day head start can matter. For routine maintenance — where you are dosing every three to four months anyway — it tends to wash out.

Duration: How Long Will Results Last?

Both products are labeled and studied at approximately the same duration window.

• Botox: Typical duration is 3–4 months for glabellar lines. The FDA label specifies that re-treatment should not be more frequent than every 3 months.
• Dysport: Typical duration is also 3–4 months, with the FDA label noting effects “may last up to 4 months” and re-treatment no more often than every 3 months.

Head-to-head studies in glabellar lines have not shown a consistent, clinically meaningful duration advantage for either product. Individual factors — your metabolism, muscle mass, dose adequacy, injection technique, and how recently you started neuromodulator therapy — drive duration far more than the brand on the vial. If duration is your single top priority and your face is right for it, the longer-acting option to discuss with your injector is Daxxify, which is studied at 6 months median duration.

Dosing and the 2.5:1 Conversion Ratio

This is the area patients get most confused about, because the units sound wildly different.

Per the FDA labels:

• Botox for glabellar lines: 20 units total, divided across 5 injection sites (4 units each).
• Dysport for glabellar lines: 50 units total, divided across 5 injection sites (10 units each).

That 50 vs. 20 difference does not mean Dysport is stronger or weaker — the units are simply defined differently. Clinically, the widely used conversion ratio is approximately 2.5 units of Dysport ≈ 1 unit of Botox, although some experienced injectors use 2.5 to 3 depending on the area treated. The FDA labels explicitly warn that the units are not interchangeable between products, so a competent injector recalculates from scratch when switching you between them.

What this means in practice: when you compare a price list, do not compare per-unit price alone. Always compare per-treatment-area price, because you will use 2.5 to 3 times more Dysport units to do the same job.

Diffusion and Precision: The Most Important Practical Difference

Dysport tends to diffuse — spread outward from the injection point — slightly more than Botox. This is not a defect, it is a feature, and it cuts both ways.

Where Dysport’s diffusion is an advantage:

• Broad, flat treatment areas like the forehead
• Patients who prefer fewer, more widely spaced injection points
• Diffuse hyperhidrosis treatment (off-label cosmetic areas)

Where Botox’s tighter footprint is an advantage:

• Crow’s feet, where the orbicularis oculi sits next to muscles you do not want to weaken
• Lip flips and perioral work, where a few millimeters of unintended spread changes your smile
• Bunny lines, chin dimpling, and other small, focal targets

A skilled injector can use either product safely almost anywhere on the upper face by adjusting dilution, injection depth, and volume per site. But the underlying tendency is real, and is the single biggest reason an experienced provider will recommend one over the other for a specific area on your face.

Cost: What You Will Actually Pay in 2026

National 2026 averages, with the caveat that prices vary substantially by city and clinic experience:

• Botox: roughly $12–$20 per unit, with most clinics in the $14–$16 range. A standard glabellar treatment (20 units) lands around $280–$320.
• Dysport: roughly $4–$7 per unit. A standard glabellar treatment (50 units) lands around $250–$350.

Translation: per-treatment cost is comparable. Dysport sometimes comes out modestly cheaper because the per-unit math rewards larger treatment areas. If a clinic is pricing Botox at $14/unit and Dysport at $5/unit, a glabellar treatment costs $280 vs. $250 — close enough that you should pick on clinical fit, not the $30 spread.

Be careful comparing clinics that quote “per area” instead of “per unit” — per-area pricing can hide undertreatment. At Naya Wellness, we quote per unit so you always know exactly what you are paying for.

Side Effects and Safety

The side effect profiles are essentially identical, because the mechanism is identical. In FDA-controlled trials, the most common adverse events for both products were:

• Headache (3–11%)
• Injection-site reactions — bruising, redness, mild swelling (1–5%)
• Eyelid drooping (ptosis), typically less than 1% in trained hands
• Asymmetric brow position, usually correctable with a small touch-up at the 2-week mark

Both products carry the same FDA boxed warning about the theoretical possibility of distant toxin spread; in the doses used for cosmetic facial treatment, this has not been a clinically meaningful concern in millions of treatments.

The single most important safety variable is not the brand — it is the injector. Choose a board-certified provider with extensive injection volume in the product they are using.

Who Is the Ideal Candidate for Each?

Botox may be the better fit if:

• You have small or focal treatment targets (crow’s feet, lip flip, chin, masseters)
• You have responded well to Botox in the past — there is no reason to switch
• You prefer a product with the longest cosmetic track record
• You are budget-flexible and want the most predictable, tightly localized effect

Dysport may be the better fit if:

• You are treating a broad area like the forehead
• You want to see softening as quickly as possible
• You have previously felt Botox “didn’t kick in fast enough” or “wore off without a clear taper”
• You want to optimize per-treatment cost for large-area treatments

Can You Switch Between Botox and Dysport?

Yes. There is no medical reason you cannot alternate between products from one treatment to the next, and many patients do. A few practical notes:

• Always tell your new injector which product you previously had, the dose, and roughly when. This guides their dose calculation and timing.
• You cannot “stack” the two in the same treatment area in the same session.
• Switching products does not reduce the (very small) risk of antibody formation against either toxin.
• Most patients report no perceptible difference when switching between sessions; the difference is much more noticeable comparing one product to a different product on the same day in the same area.