Dysport and Botox are not the same product, but they work in the same way. Both are injectable forms of botulinum toxin type A that temporarily relax muscles by blocking nerve signals. They share the same active ingredient at the molecular level, a 150 kDa neurotoxin protein, yet they differ in formulation, dosing, and how they behave once injected. These differences matter enough that the two products are not interchangeable.
Same Core Toxin, Different Formulations
Both Dysport and Botox start with the same neurotoxin protein produced by Clostridium botulinum bacteria. That core protein has a molecular weight of about 150 kDa, making it hundreds or even a thousand times larger than most conventional drugs. What surrounds that core protein is where the two products diverge.
Botox and Dysport both contain accessory proteins bundled around the neurotoxin, but in different-sized complexes. Think of it like two versions of the same engine wrapped in different housing. Each product also uses a unique manufacturing process and different stabilizing ingredients. Botox contains about four times as much human serum albumin (a protein stabilizer) per milliliter as Dysport does. These formulation differences affect how the products are stored, diluted, and dosed, and they influence how the toxin behaves once it’s under your skin.
Units Are Not Interchangeable
This is the most important practical difference: one unit of Botox does not equal one unit of Dysport. The units are measured using different laboratory tests, so the numbers aren’t directly comparable. In clinical practice, providers generally use a conversion ratio of roughly 2.5:1 to 3:1, meaning it takes about 2.5 to 3 units of Dysport to match the effect of 1 unit of Botox.
That ratio isn’t perfectly settled. Published studies have tested ratios ranging from 2:1 all the way to 4:1, and the results suggest the sweet spot falls somewhere around 2.5:1 for most cosmetic uses. In Germany, for example, the recommended dose for frown lines is 50 units of Dysport compared to 20 units of Botox, a 2.5:1 ratio. For underarm sweating in Austria, the ratio drops to 2:1. A study testing a 3:1 ratio for forehead wrinkles found that Dysport actually produced stronger effects than Botox at that dose, suggesting the true equivalence point is lower than 3:1.
The takeaway: your provider needs to know which product they’re using and dose accordingly. Swapping one for the other without adjusting the dose could mean underwhelming results or unwanted muscle weakness.
What the FDA Approves Each For
Both products carry FDA approval for cosmetic use on glabellar lines, the vertical frown lines between your eyebrows. Dysport’s cosmetic approval specifies adults under 65 with moderate to severe lines. Botox has a broader range of FDA-approved cosmetic indications, including crow’s feet and forehead lines, giving it more officially sanctioned uses for facial aesthetics.
Both products also have medical approvals for conditions like cervical dystonia (involuntary neck muscle contractions) and certain types of muscle spasticity, though the specific approved conditions vary between them. Providers sometimes use either product off-label for areas like the jawline, chin, or neck bands.
Onset, Spread, and Duration
Many patients and providers report that Dysport kicks in slightly faster than Botox, often within two to three days rather than four to seven. This likely relates to how the smaller protein complexes in Dysport diffuse after injection. That broader spread can be an advantage when treating larger areas like the forehead, where you want even, natural-looking relaxation. It can be a disadvantage in smaller, more precise areas where you need the effect to stay tightly localized.
Duration is broadly similar for both products, typically lasting three to four months before muscle activity gradually returns. Individual results vary based on the dose used, the area treated, and your own metabolism. Some patients find one product lasts slightly longer for them than the other, which is one reason people sometimes switch between brands.
Side Effects and Safety
The side effect profiles are nearly identical. The most common issues are mild bruising at the injection site, temporary headache, and occasional small lumps. The most notable cosmetic side effect is eyelid drooping, which can happen with either product if the toxin migrates into nearby muscles. One study found that using a higher conversion ratio (4:1 Dysport to Botox) produced equivalent results but increased the risk of side effects with Dysport, reinforcing why accurate dosing matters.
Both products carry the same rare but serious risk of the toxin spreading beyond the injection site. Signs of this include difficulty swallowing, breathing problems, facial muscle weakness, or speech changes. This is extremely uncommon in cosmetic doses but is listed as a warning for both brands.
Because both Dysport and Botox contain accessory proteins alongside the neurotoxin, they carry a slightly higher theoretical risk of triggering an immune response over time compared to a newer product, Xeomin, which contains only the purified neurotoxin. If your body develops antibodies to the toxin, treatments can become less effective. In practice, this is uncommon at cosmetic doses.
How Costs Compare
Dysport costs less per unit, typically $4 to $8, while Botox runs $10 to $25 per unit. But because Dysport requires roughly 2.5 to 3 times as many units, the total cost for a treatment session often ends up in a similar range. For frown lines, you might pay for 50 units of Dysport versus 20 units of Botox, and the final bill could be comparable.
Some providers and patients find that Dysport works out slightly cheaper overall, but the gap is smaller than the per-unit prices suggest. Neither product is typically covered by insurance for cosmetic use.
Choosing Between Them
There is no clinical evidence that one product is categorically better than the other for cosmetic wrinkle treatment. The choice often comes down to practical factors: which product your provider is experienced with, how your body responds to each one, and whether you prefer slightly faster onset or tighter localization of the effect. Some people try both over time and settle on a preference based on how long results last or how natural the outcome looks.
If you’re switching from one to the other, make sure your provider adjusts the dose rather than simply matching the unit count. The products use different unit scales, and treating them as equivalent is the most common source of unsatisfying results when patients switch brands.