Dysport tends to last slightly longer than Botox, though the difference is modest. Both treatments typically wear off around the four-month mark, but clinical evidence suggests Dysport maintains its effect a bit further into that window. A randomized double-blind study published in JAMA Dermatology found that Dysport’s effect was statistically significantly longer-lasting than Botox’s, with the difference becoming measurable starting at 10 weeks after injection and persisting through the full 20-week observation period.
How Long Each Treatment Lasts
In practice, both Botox and Dysport last roughly three to four months for cosmetic use. The Cleveland Clinic puts the average at about four months for both. But “about four months” is a range, not a fixed number, and the evidence tilts in Dysport’s favor at the tail end of that range.
The JAMA Dermatology trial compared both products head-to-head on forehead wrinkles, measuring both visible smoothing and actual muscle activity with electrodes. For the first 10 weeks, the two performed nearly identically. After week 10, Dysport continued suppressing muscle movement and smoothing wrinkles while Botox’s effect had begun to fade. That gap remained statistically significant through week 20, the end of the study.
This doesn’t mean Dysport gives you an extra month of results. It means that when your Botox is noticeably wearing off, Dysport might still be holding on. For most people, the practical difference is a few weeks at best.
Why Dysport May Edge Out Botox
Dysport spreads more broadly after injection than Botox does. Research measuring the area of wrinkle reduction after injection found that Dysport produced a significantly greater diffusion area compared to other formulations at the same volume. This wider spread is one reason providers like Dysport for larger surface areas like the forehead.
Interestingly, the two products contain the same active molecule: a 150-kilodalton neurotoxin that blocks signals from nerves to muscles. The difference is in how they’re formulated. Dysport’s formulation appears to distribute across tissue differently, which may contribute to its slightly longer duration in certain areas. However, greater spread isn’t always an advantage. When toxin diffuses too far from the injection site, it can weaken surrounding muscles you didn’t want affected, and some research suggests excessive diffusion could actually reduce how strong and long the effect is at the target site.
Dysport Works Faster, Too
Duration aside, one difference people notice right away is onset speed. Dysport typically starts softening lines within two to three days, while Botox takes three to five days to become visible. Both reach their peak effect at roughly 10 to 14 days, so by the two-week mark, you’re seeing the full result regardless of which product you chose.
This faster onset is part of why some patients perceive Dysport as lasting longer. When your results appear sooner, the total window of visible improvement stretches a bit wider on both ends.
Dosing Isn’t One-to-One
One important detail: Botox and Dysport use different unit measurements. You’ll need roughly two to three Dysport units for every one unit of Botox to get equivalent results. The most commonly used conversion ratios are 1:3 or 1:4, though research on conditions like spasticity and cervical dystonia suggests 1:3 (or even lower) produces clinical equivalence.
This means if you typically get 20 units of Botox in your forehead, you’d need around 50 to 60 units of Dysport. The higher unit number doesn’t mean you’re getting a stronger dose. It’s simply a different measurement scale, like converting miles to kilometers.
What Actually Determines How Long Your Results Last
The choice between Botox and Dysport matters less for longevity than several other factors that vary from person to person.
Exercise intensity has one of the strongest effects. A controlled clinical trial found that people with high levels of physical activity saw their results fade significantly faster than less active people. The low-activity group maintained significantly better wrinkle reduction at the one, two, and three-month follow-ups, while the high-activity groups showed muscle recovery already by the second month. The likely explanation involves muscle reinnervation: intense exercise promotes the release of growth factors that help nerves regrow connections to paralyzed muscles, essentially speeding up the body’s reversal of the toxin’s effect.
Dose also matters. Higher doses within the safe range generally last longer because more nerve endings are blocked, and it takes the body longer to restore all of them. Your provider’s injection technique, including the volume of fluid used and the precise placement, affects how concentrated the toxin stays in the target muscle versus how much drifts into surrounding tissue.
The treatment area plays a role as well. Smaller, thinner muscles like those around the eyes tend to respond more completely but may also recover faster than the larger muscles of the forehead. And individual variation is real: some people’s bodies simply clear the toxin faster than others, regardless of which product they use.
Satisfaction Is Similar for Both
Despite the slight edge in duration, patient satisfaction doesn’t meaningfully differ between the two products. A double-blind prospective study comparing multiple types of botulinum toxin in the frown line area found no clinically significant difference in patient-rated scores at any follow-up visit. People were equally happy with their results whether they received Botox or Dysport.
This makes sense when you consider that the duration difference is measured in weeks, not months. If your Botox lasts 14 weeks and your Dysport would have lasted 16, you might not even notice unless you were tracking it carefully. Most people schedule touch-ups on a regular cycle anyway, typically every three to four months, which smooths out the practical difference between the two.
If maximizing duration is your top priority, Dysport has a slight clinical advantage. But the bigger levers are how much you exercise, how your individual metabolism handles the toxin, and whether your provider is using the right dose and technique for your anatomy.