Why didn’t my Botox work?

There are five common reasons, and they are worth going through in order of how often each turns out to be the real one: it has not been long enough, the dose was too small, the wrong muscle was treated, the line was never dynamic in the first place, or, last and least often, genuine resistance to the product. Most people who conclude the last one are actually in the first three.

1. It has not been long enough

Onset is gradual. Some movement reduction appears in the first few days, and the result continues to develop for roughly two weeks. Judging at day four is judging an unfinished treatment, and it is the most common version of this question. The full timeline is here.

2. The dose was too small for your muscle

Muscle strength varies a great deal between people, and a dose that works well on an average frontalis will underperform on a strong one. This is the usual explanation when someone reports that the effect was real but faded in six or eight weeks rather than absent altogether. The product worked, there was just not enough of it to last a normal interval.

It is also why men frequently conclude Botox does not work on them. Greater muscle mass, standard dose, early fade.

The fix is straightforward once someone knows what you actually received, which is the argument for asking for your units in writing every time. Typical ranges by area.

3. The wrong muscle was treated

A line is produced by a specific muscle pulling in a specific direction. Treating the muscle next to it softens something, just not the thing you came in about. Crow’s feet treated without attention to how you actually squint, or forehead lines treated evenly across a forehead whose upper and lower thirds behave differently, both produce this outcome: something changed, but not the thing you wanted.

This is a planning failure rather than a product failure, and it does not get better by adding more of the same.

4. The line was not dynamic

Neurotoxin relaxes muscle. It does not erase a crease that is etched into the skin itself. Deep static lines soften somewhat as the muscle stops reinforcing them, often over several treatment cycles, but a line that is visible with your face completely still was never going to disappear from one treatment. If nobody set that expectation beforehand, the treatment gets blamed for a promise it was never able to keep. Which problem you have.

5. Genuine resistance

It exists. Some people develop neutralising antibodies to the protein component of these products, and in those cases the treatment really does stop working. It is uncommon, and it is a diagnosis of exclusion, meaning it is what is left after the four above have been genuinely ruled out, not the first explanation to reach for.

If it is suspected, switching to a product formulated without the accessory proteins is one of the approaches discussed. How the products differ.

What to do next

• Wait until day fourteen before concluding anything.
• Find out what you received: which product, how many units, which areas. If you cannot get that information, that is itself informative.
• Take a photo at rest and one making the expression, in daylight. It is far more useful than memory at the next appointment.
• Go back. A two week review exists for exactly this, and an injector who does not want to see you at two weeks is skipping the most valuable appointment in the cycle.