How long does Botox last, and why did mine wear off early?
Three to four months is typical. Wearing off at six weeks usually means something specific, and it is rarely what patients are told.
Written by Ben Tracy, MD, physician injector, Draper and Lehi, Utah. Last reviewed September 13, 2026.
Three to four months is the usual range for the traditional products. If yours is consistently gone at six or seven weeks, that is not normal and it is worth investigating rather than accepting. In most cases it points to dose or placement rather than to your body breaking the product down unusually fast.
This page is about the far end of the cycle. If your treatment is recent and you are wondering when it starts rather than when it stops, how long it takes to work is the other half.
What the timeline actually looks like
| When | What is happening |
|---|---|
| Day 1 to 2 | Usually nothing visible. Small raised bumps at the injection points settle within an hour or two. |
| Day 3 to 5 | Movement starts to change. Most people notice it here first. |
| Day 10 to 14 | Full effect. This is the only honest point at which to judge the result. |
| Week 6 to 10 | Peak plateau. Movement gradually begins returning. |
| Month 3 to 4 | Typical return of full movement for most people. |
Why it wears off early, in order of likelihood
You were underdosed
By far the most common reason. A dose that is slightly too small for the muscle produces a visible result initially and then fades quickly, because there was never much margin. This is particularly common in first treatments, where being conservative is correct, and in practices selling by the area rather than dosing to the face.
Your muscles are genuinely strong
Strong, frequently used muscles recover faster. People who are very expressive, who train heavily, or who have unusually powerful frontalis or masseter muscles often run shorter than average and simply need more product to reach the same duration.
You are judging from the wrong starting point
If you assess the result at day five rather than day fourteen, everything afterwards feels like it faded faster than it did. This sounds trivial and it accounts for a meaningful share of early wear off complaints.
Dilution
A heavily diluted vial spreads further and can behave differently from the same number of units at a standard concentration. This is worth asking about if you switched practices and noticed a change in how long things lasted. How to ask about dilution.
Actual resistance
Genuine neutralising antibodies exist but are uncommon, and they are the last explanation to reach for rather than the first. The tell is a patient who had years of good results that progressively stopped working despite adequate dosing, not someone whose first two treatments ran short.
What does not shorten it as much as people think. Exercise, saunas and metabolism get blamed constantly. Very high training volume may shave something off at the margins. None of it explains a result that disappeared in six weeks.
Treating too often does not help
Returning every six or eight weeks to chase a fading result is the pattern most associated with developing reduced response over time. Consensus practice is to leave at least three months between treatments of the same area. If you cannot get three months out of a treatment, the fix is a better dose, not a shorter interval.
General information, not medical advice, and not a substitute for assessment. Individual anatomy and product response vary, so nothing here predicts your result.