Neuromodulators (Botox / Dysport): how long before you see the effect?

You leave your appointment, look in the mirror… and nothing has changed. That's normal. Neuromodulators (Botox / Dysport) don't work instantly: the effect builds over a few days, then peaks around two weeks. Here's what to expect, day by day.

Why it isn't immediate

A neuromodulator acts on the communication between nerve and muscle. It first has to bind to the nerve endings, then gradually block the signal that makes the muscle contract. That takes a few days: the muscle relaxes gradually, and the line it creates softens with it.

The timeline, day by day

• Day 0: small bumps at the injection points, gone within 15 to 30 minutes. Sometimes a small bruise.
• Days 2 to 5: first effects appear. Movement becomes a little weaker.
• Days 7 to 10: the effect is clearly visible. Expression lines soften noticeably.
• Days 10 to 14: full effect. This is the right time to judge the result and, if needed, touch up.
• Months 3 to 4: movement gradually returns. Time to plan the next session.

Area by area

The timings below are guides. They vary from person to person.

• Frown lines (glabella): first effects around 2 to 4 days, full effect around 2 weeks.
• Forehead: first effects around 3 to 5 days, full effect around 2 weeks.
• Crow's feet: first effects around 3 to 5 days, full effect around 2 weeks.
• Lip flip: visible around 5 to 7 days, full effect around 2 weeks.
• Brow lift: effect around 5 to 10 days, full effect around 2 weeks. See our brow lift guide.
• Masseters: less clenching after 1 to 2 weeks; jaw slimming shows more after 4 to 8 weeks. Full details in how long masseter neuromodulators last.
• Underarms (sweating): sweating usually decreases after a few days, at its lowest around 2 weeks.

What changes the timing

• Muscle strength: a very active or larger muscle can take longer to relax. Men often need larger doses.
• Dose: a microdose gives a subtler effect, sometimes slower to notice.
• Product: approved brands can differ slightly in onset speed and spread. The choice is made at consultation.
• Area: small muscles often respond faster than large ones.
• Your history: for a first time, we often dose cautiously, then adjust at follow-up.

First time? What to know

Don't judge the result before two weeks. If one side seems to react faster than the other on day 4, that's common: wait for the full effect. And if you have an important event, book at least two weeks before, to enjoy the full effect and leave time for a touch-up if needed.

For the best result

• Stay upright for about 4 hours after the injection.
• Avoid intense exercise, sauna and spa for 24 hours.
• Don't massage the treated areas the same day.
• Postpone facials and skin treatments by a few days.

All the instructions are in what not to do after your treatments.

FAQ

Can I see results the same day?

No. First effects usually appear after 2 to 5 days, and the full effect around two weeks.

How long does the effect last?

Usually 3 to 4 months for facial areas, often longer for masseters. It varies by person, dose and area.

Why does it wear off faster for some people?

A fast metabolism, very strong muscles, intense physical activity or a smaller dose can shorten the duration.

When can I have another session?

We usually wait until the effect starts to fade, about 3 to 4 months. A touch-up is done around two weeks.

Nothing changed after two weeks. What should I do?

Come back and see us. We'll assess the result and adjust if needed.

Ready to plan your treatment?

To understand areas, prices and safety, read our complete guide to neuromodulators. You can book online or request a free consultation. Questions? Call us at 438 449-2380.