How long does Botox last?
The most realistic working figure for cosmetic botulinum toxin is about 3–4 months, but the effect does not end on one day; it fades gradually. In the BOTOX Cosmetic frown-line studies, 80% were responders at day 30, 70% at day 60, 48% at day 90 and 25% at day 120. In Botox studies of crow's feet lines, the median response among responders was about 125–144 days, depending on how it was assessed.
Key numbers
- 3–4 months — Common duration
- 48% at day 90 — Frown lines — FDA
- 25% at day 120 — Frown lines — FDA
- 125–144 days — Crow's feet lines
Why does it last longer for some people?
- Muscle and area: the forehead, frown area and jaw muscle are not the same.
- Dose and placement: what matters is not only the number of units but where and how they were placed.
- Muscle strength and the person's movement pattern.
- The product itself; units are not directly interchangeable between products.
- Previous treatments and individual response.
When should I have it again?
The decision is not based on a calendar date alone. Treatment is repeated when movement and lines return enough to justify a new session, at an interval consistent with the product's directions and medical assessment. A higher dose just to chase a longer effect is not a goal in itself if it changes natural movement or brow position.
Key takeaways
- 3–4 months is a realistic common figure, not a guarantee.
- Part of the effect lasting into the fourth month is documented in BOTOX Cosmetic studies.
- The result fades gradually; there is no single day when Botox ends for everyone.
Botox on the Face: Where It Helps and When It Becomes Too Much