Too much Botox: frozen face, how long it lasts, what to do

You feel you have had too much botulinum toxin: your forehead no longer moves at all, your eyebrows feel heavy, your eyes look tired or your expression seems frozen. It is unpleasant, sometimes worrying, but almost always temporary. This page is part of our guide for when an injection goes wrong; it explains what is happening, how long it may last and what you can do.

What does an effect that is too strong look like?

An effect that is too strong means the muscles have relaxed more, or over a wider area, than you expected. The most common situations involve the upper face:

• a frozen forehead, which no longer creases at all when you raise your eyebrows;
• drooping eyebrows or a feeling of heaviness in the forehead and eyelids: a drooping eyebrow is a common adverse effect after treatment of the forehead with a type A toxin², and a feeling of heaviness is described with another product³;
• tired-looking eyes when the upper eyelid droops as well².

Each of these situations has its own page, for example for a frozen forehead after an injection or a drooping eyebrow after an injection. In the lower face, an effect that is too strong can affect the smile or how the lips move: the atlas pages for these areas describe it. For the upper face, the page that brings together forehead problems after an injection is a good place to start.

This feeling should be distinguished from a real imbalance. A very smooth forehead may correspond exactly to the effect intended by the treatment, which aims to soften lines by relaxing the muscles. The question is whether the result bothers you, and whether a function is affected, such as vision when the eyelid droops.

Why can the effect be too strong?

The effect depends on the dose injected, the number of injection points and the strength of each person’s muscles. Type A labels also advise avoiding injections near certain muscles, such as the one that lifts the eyelid or the zygomaticus major, which pulls up the corner of the mouth, to limit effects on these neighbouring muscles^2,3.

Other factors can strengthen the effect. Another injection of toxin given before the effect of the previous one has worn off can make muscle weakness worse¹. Some medicines, such as aminoglycoside antibiotics or muscle relaxants, can increase the effect of the toxin¹. People with a disorder of the junction between nerve and muscle, even one not yet diagnosed, are at risk of more widespread effects¹. That is why it matters to mention your treatments and medical history before each injection.

How long before the effect wears off?

An effect that is too strong lasts, at most, as long as the effect of the product. For type A toxins approved for aesthetic use, the effect has been shown for up to about 4 months, depending on the product^2,3,4. With one product, the reduction in forehead lines was seen for up to 6 months². For the short-acting botulinum toxin (serotype E), the effect generally lasts 2 to 3 weeks¹. As of 9 October 2026, this toxin is approved in the European Union (since 15 July 2026) and in Canada (since 22 June 2026)^6,7.

The effect does not stop from one day to the next. After the peak, it decreases gradually, as the nerve terminals recover¹. In practice, movement comes back little by little. If you do not know which product was injected, ask the doctor: the short-acting toxin label requires the name and batch number of the product given to be recorded¹.

Can the effect be made to wear off faster?

The labels describe no treatment that cancels the effect of the toxin. In case of overdose, they provide for medical monitoring and care adapted to the symptoms^1,2. Time remains the main factor in recovery.

Some consequences can, however, be eased. When the eyelid droops, eye drops prescribed by a doctor can partly lift it⁵: this is covered on the page about the drooping eyelid, available from the atlas.

Can another injection rebalance the result?

The doctor sometimes considers a small additional injection to rebalance a result, for example on one side of the face. This decision is made after an examination, never on request and in a hurry, for two reasons taken from the labels:

• another dose of toxin before the effect of the previous one has worn off can make muscle weakness worse¹;
• type A labels generally require at least 3 months between two treatments^2,3, and for the short-acting toxin, repeat injections less than 6 weeks apart have not been evaluated¹.

Adding toxin to a muscle that is already too relaxed makes no sense: it can only strengthen the effect.

Effect too strong or true overdose?

An aesthetic effect that is too strong stays within the treated area. Overdose, as the labels define it, is a different and much rarer situation: excessive doses can cause paralysis of the muscles, local or distant^1,2. The signs to watch for are a drooping eyelid, double vision, difficulty swallowing or speaking clearly, generalised weakness or difficulty breathing¹. They may not appear immediately after the injection^1,2.

If you notice these signs, do not wait: call emergency services (15 or 112 in France, or your local emergency number). The labels then provide for a prompt medical assessment and, if needed, hospital admission^1,2.

Preventing it from happening again

Before another session, talk to the doctor about the previous result: what bothered you, when, and for how long. The labels call for caution if complications occurred with previous injections¹ and, before a new injection of the short-acting toxin, ask doctors to confirm there was no known adverse reaction to this product¹. Keep a record of each session: date, product, areas treated. If, on the contrary, the effect of the toxin seemed too weak, our page on botulinum toxin that does not work details the possible causes, and the one on the side effects described in the labels lists the other reactions.