Duration is where Dysport and Botox get compared most, and the honest answer is that the gap is small. Cleveland Clinic gives a number and a caveat, and they are worth reading together.

The duration figure

On how long each lasts, Cleveland Clinic writes: "Botox and Dysport have similar duration of action, too, both lasting three to four months at equally potent dosage. Any difference is not clinically significant."

So the planning number for either product is three to four months, and the same source says any difference is not clinically significant.

Where a different line appears

Another Cleveland Clinic page leans slightly the other way: "As a result, Dysport may offer faster outcomes, but Botox may last longer."

The two lines fit together once you notice the hedges. One says the difference is not clinically significant, the other says Botox "may" last longer. Read a longer hold for Botox as a possibility, not a proven edge.

What this means for upkeep

If both last three to four months, the recurring cost per year is about the same visit schedule either way. Ask your provider about the price per visit for each, because the repeat appointments, not the brand name, set what you spend.

Cleveland Clinic has more on the product, including the Botox Cosmetic page covering uses and side effects, an overview of cosmetic injectable treatments, a piece on long-term effects of Botox and a lip flip guide.

Choosing for duration

Do not pick a product to gain a few weeks. Pick the injector, then book the next visit before the current one wears off.