Dysport is not stronger than Botox in any straightforward sense. The two products use different unit measurements, so comparing them number-to-number is misleading. Unit for unit, Dysport is less potent, which is why a typical treatment requires about 2.5 to 3 times as many Dysport units as Botox units. But when dosed at the right conversion ratio, the two products produce very similar results, and some clinical evidence suggests Dysport may actually have a slightly greater and longer-lasting effect at commonly used doses.
Why the Units Are Not Interchangeable
Botox and Dysport both contain botulinum toxin type A, but they’re manufactured differently, resulting in distinct formulations with their own unit systems. One unit of Botox does not equal one unit of Dysport. In lab assays, one Botox unit has been measured as equivalent to roughly 2.5 to 2.87 Dysport units, depending on the testing method. This is why a treatment that calls for 20 units of Botox typically uses about 50 to 60 units of Dysport.
The conversion ratio has been debated for years. Published studies have reported ratios anywhere from 1:1 to 6:1, but the more reliable recent evidence clusters around 2.5:1 to 3:1. In Germany, manufacturers recommend a 2.5:1 ratio for treating frown lines (50 units of Dysport versus 20 units of Botox). In clinical trials testing a 3:1 ratio, Dysport consistently produced marginally greater effects on forehead wrinkles and muscle activity than Botox, suggesting even 3:1 gives Dysport a slight edge. The practical takeaway: at standard doses, the two are comparable, but Dysport may deliver a touch more muscle relaxation per treatment session.
How They Spread Differently
The biggest functional difference between Dysport and Botox is how far the product travels from the injection site. Dysport diffuses more broadly, covering a wider area per injection point. Botox stays closer to where it’s placed, giving injectors tighter control over exactly which muscles are affected.
Dysport’s wider spread has real advantages. It can cover a large, flat area like the forehead with fewer needle sticks, often producing a smoother, more uniform result. For the frown lines between your eyebrows, this broader diffusion works well because the target muscles span a relatively wide zone.
The tradeoff is precision. Around the eyes, near the brow, and close to the lips, a product that spreads too freely can relax muscles you don’t want relaxed. This is why many injectors prefer Botox for crow’s feet or brow-shaping work, where even a small amount of unwanted spread could cause a droopy eyelid or an uneven brow. Dysport isn’t dangerous in these areas, but it demands more experience and careful placement.
Speed and Duration of Results
If you care about how quickly results appear, Dysport has a consistent advantage. Clinical trials have found that Dysport kicks in faster than Botox, with some patients noticing effects within two to three days rather than the four to seven days typical of Botox. One trial also reported significantly less injection pain with Dysport. For people treating wrinkles before an event or wanting minimal downtime, this faster onset can be a meaningful selling point.
Duration is harder to compare definitively because it varies by individual, dose, and treatment area. Both products generally last three to four months. Some research suggests Dysport may edge out Botox slightly in longevity, and a clinical study found that 95% of Dysport patients maintained high satisfaction levels with just two treatments per year, which implies effects lasting around six months for some people. Your own results will depend on your metabolism, the muscles being treated, and how your body responds to the toxin over time.
What Each Product Is Approved to Treat
Botox has a much wider range of approved cosmetic uses. It’s cleared for frown lines, forehead lines, and crow’s feet. Dysport is only FDA-approved for frown lines (the vertical creases between your eyebrows). That doesn’t mean Dysport can’t be used elsewhere. Injectors frequently use it off-label on the forehead and other areas, but if you want a product specifically approved for crow’s feet, Botox is your option.
On the medical side, Botox has approvals spanning migraines, overactive bladder, crossed eyes, jaw disorders, and excessive sweating, among others. Dysport’s medical approvals are narrower: cervical dystonia, upper limb spasticity in adults, and lower limb spasticity in children. Both products are effective muscle relaxants, but Botox has been studied and approved for far more conditions.
How Cost Actually Compares
Dysport’s per-unit price is lower, typically $4 to $8 per unit compared to $10 to $25 per unit for Botox. But since you need roughly three times as many Dysport units, the total cost for a treatment session often lands in a similar range. Treating frown lines might require about 20 units of Botox or 60 units of Dysport. At average prices, the Dysport treatment tends to come in slightly cheaper overall, though this varies by provider and location.
Some clinics price by area rather than by unit, which eliminates the math entirely. If you’re comparing costs, ask your provider for total treatment pricing rather than trying to calculate unit-by-unit equivalents on your own.
Which One Is “Better” Depends on the Goal
Neither product is categorically stronger or weaker. They’re different formulations of the same active toxin, dosed at different scales. When matched at appropriate conversion ratios, they produce comparable muscle relaxation, though Dysport may deliver slightly more effect at standard recommended doses, kicks in faster, and covers a wider area per injection. Botox offers more precise placement, a broader range of approved uses, and a longer track record across diverse treatment areas.
Your injector’s familiarity with the product matters at least as much as the product itself. An experienced provider who works with Dysport daily will likely get better results with it than someone who rarely uses it, and the same is true for Botox. If you’re switching between the two, make sure your provider adjusts the dosing rather than simply matching unit counts, since that’s where problems with over- or under-treatment tend to occur.