Botox and Dysport: how they differ, and how to choose

Reviewed by our licensed nurse injector. Last reviewed July 2026.

Both are neuromodulators, which means they temporarily reduce the signal between a nerve and a muscle. When a targeted muscle relaxes, the skin over it creases less, and the dynamic lines that come from expressions like frowning or squinting soften. They do not fill lines, and they are not the same as dermal filler, which adds volume.

Because they work on movement, they are used most often for the forehead lines, the frown lines between the brows, and the crow's feet beside the eyes. A skilled injector treats only the muscles that need it, so your expressions still read as yours.

Dysport is formulated a little differently and can spread slightly more from each injection point, which some injectors like for larger areas such as the forehead. It may also start to show its effect a touch sooner for some people, often within two to three days, while Botox can take three to five days to settle in. These are small tendencies, not hard rules.

Dosing is measured differently between the two products, so the numbers are not directly comparable, and that is entirely normal. What matters is the result, not the unit count. Both tend to last a similar length of time, and neither is universally stronger or better. The right choice usually comes down to the area being treated and your injector's experience with each.

For most people, results from either Botox or Dysport last about three to four months. As the effect gradually wears off, muscle movement returns and the lines slowly come back, which is why the treatment is repeated over time rather than being a one-time fix.

Everyone metabolizes these products at their own pace, so your timeline may run a little shorter or longer. We cannot promise an exact duration, and we will not pretend to. What we can do is set an honest expectation and plan your next visit around how your body actually responds.

Both products have a long track record when they are given by a trained, licensed injector who understands facial anatomy. Common effects are usually mild and temporary, such as small bruising or tenderness at the injection sites. During your consultation we review your history, what you want to soften, and whether treatment is a good idea for you at all.

Our approach is conservative on purpose. We would rather start with a lighter dose and invite you back for a two-week touch-up than overtreat and leave you looking frozen. If the honest answer is that you do not need it yet, that is what we will tell you. The goal is to look like yourself, a little more rested, never done.