What it is, and what it is not
Botulinum toxin is a medically prepared protein. Injected in a precise dose into a specific muscle, it reduces that muscle's contraction for a limited period. Lines that form from repeated movement — across the forehead, between the brows — become less pronounced because the muscle moves less.
It does not fill a hollow, and it does not tighten lax skin. It acts on movement, not on volume. That distinction decides when it is appropriate, and it is the most common source of disappointed expectations when it is not explained beforehand.
Where it is used
- Forehead lines
- Lines between the brows
- Lines around the eyes
- A slight lift at the tail of the brow
- The jaw muscle, to ease clenching or soften the jaw angle
- Excessive sweating, underarm or palms
- In selected cases: a gummy smile, and neck bands
An area appearing on this list does not mean it suits everyone. What is appropriate is decided by examination.
When it starts, and how long it lasts
The effect usually begins within a few days and settles around the second week. How long it lasts varies from person to person, influenced by muscle strength, dose and daily movement patterns. No fixed number is given before an examination — any number quoted before you are seen is a guess.
Who it suits
- Those more bothered by lines on movement than by static lines
- Those who understand the effect is temporary and needs repeating to maintain
- Those who want a result that keeps their expression
- Those whose general health allows it, with none of the reasons below applying
When we advise delaying or not treating
- Pregnancy and breastfeeding
- Certain neuromuscular conditions, such as myasthenia gravis
- Active infection or inflammation at the injection site
- Known allergy to a component of the product
- A deeply etched static line that does not come from movement — this alone will not address it, and we explain the alternative rather than inject
- Marked skin laxity; that is a different problem entirely
- A wish for a face without expression. That is a request we decline, and we say so plainly
How the session goes
- Examination and a conversation about expectations, with a review of medical history, medicines and supplements.
- Mapping the target muscles while they move, not at rest alone.
- Cleaning the skin, then injecting through a fine needle at defined points.
- The session is short. Sensation varies; many describe a brief repeated sting.
- A review at around two weeks to assess the result and adjust if needed.
Afterwards
- Stay upright for a few hours
- Avoid rubbing or massaging the area the same day
- Avoid strenuous exercise and high heat — sauna, steam room — the same day
- Mild redness or small bumps at the injection points usually settle within hours
Possible effects
Stated in full, because a decision is not sound without them:
- Bruising or redness at the injection site
- A mild temporary headache
- Slight asymmetry, which can usually be adjusted at review
- Temporary drooping of an eyelid or brow — uncommon, and resolves as the product wears off
These are temporary by the nature of the product itself, which wears off gradually.
A note on darker skin
How this works on muscle has nothing to do with skin tone. The needle itself, however, can leave temporary post-inflammatory pigmentation more readily in deeper skin tones. That is reduced by using fewer points where possible and by managing any bruising promptly.
This and filler are not alternatives
They are sometimes asked for as though they were one thing. They are not, and the difference is practical rather than linguistic:
| Botulinum toxin | Dermal filler | |
|---|---|---|
| What it addresses | Lines formed by repeated muscle movement | Lost volume, or a feature needing support |
| How it works | Reduces contraction of a specific muscle for a limited period | Adds volume or structure beneath the skin |
| Common areas | Forehead, between the brows, around the eyes | Cheeks, chin, jawline, lips |
| When it shows | Gradually, over days | Visible immediately, settles as swelling subsides |
| Reversibility | Wears off on its own | Hyaluronic acid products can be dissolved |
They can be combined in a single plan when the examination calls for it. See also the dermal fillers page.
Common questions
Does it hurt?
Sensation varies from person to person. Most describe a brief repeated sting, and the needle used is fine. We do not describe the procedure as free of sensation, because that would not be accurate.
Will my face look frozen?
That is a result of dose and placement, not of the product itself. The aim is to soften a line while movement and expression remain. If the request is to stop expression altogether, that is not something we do.
How many sessions will I need?
The examination decides. The number and spacing vary with the muscle, its strength and the goal, and cannot be set before you are seen.
When will I see the result?
The effect usually begins within days and settles around the second week. Judging the result before then is premature.
If I stop, do the lines come back worse?
No. The product wears off gradually and muscle movement returns as it was. Stopping does not leave things worse than before.
Does it suit darker skin?
Yes; its action on muscle does not depend on skin tone. The only consideration is possible temporary pigmentation from the needle, managed as described above.
Can I exercise afterwards?
Better to avoid strenuous exercise on the same day, then return to normal.
I am pregnant or breastfeeding.
We postpone. We do not treat during pregnancy or breastfeeding.
Can it be combined with filler in one session?
Sometimes yes, and sometimes it is better to separate them. The examination and the area decide.
What is the difference between the brand names?
Different products working on the same principle, differing in details of dose and spread. Choosing between them is part of the clinician's decision, not the patient's request.