Why Does Botox Seem to Stop Working?

Why does Botox seem to stop working? It is a question I hear increasingly often from patients who have had treatment for years. They usually describe one of two things. Either their Botox seems to wear off earlier, or it no longer produces the smooth result they remember.

The understandable conclusion is, “I think I’ve become resistant to Botox.” That can happen. However, genuine resistance is uncommon.

Much more often, the Botox is still working. What has changed is the face we are treating. Your muscles change with age. Your skin changes. Your eyebrows move. Your expectations can change too.

Furthermore, different doses and different botulinum toxin products can produce quite different results. So, before deciding that Botox has “stopped working”, we need to understand what has actually changed.

TL;DR

Botox can genuinely become less effective in a small number of people. However, several much more common explanations exist.

Your face may have aged. Your skin may now have lines at rest. Your doctor may need to alter your dose. You may also have changed product or practitioner.

In addition, some patients become very sensitive to the first signs of returning movement. True resistance caused by neutralising antibodies exists. Nevertheless, published evidence suggests it remains uncommon.

Therefore, the solution is not automatically more Botox. The first step should be a proper medical assessment.

Why does Botox seem to stop working?

This is where I would start in clinic. What does “not working” actually mean?

Does it mean nothing happened after your treatment? Does it mean you started moving again after eight weeks? Or does it mean that a wrinkle you once barely noticed is now visible?

Those are very different problems. Botulinum toxin temporarily reduces activity in selected facial muscles. It does not stop the ageing process.

Moreover, successful treatment does not necessarily mean eliminating every bit of facial movement. In our recent podcast, Amber Graafland and I discussed how often patients equate movement with their Botox wearing off.

Many patients tell me they want a natural result. However, as soon as they see movement, some become concerned. Yet some movement can be entirely appropriate.

Particularly as we get older, completely freezing parts of the face can look unnatural. Therefore, the result I want at 50 may differ from the result I wanted at 30.

Your face changes as you get older

One of the most important things to understand about aesthetic treatment is that your face is not static. The treatment that worked perfectly ten years ago may need to change.

As we age, several things happen together. Muscles change in strength and the way we recruit them. Meanwhile, the skin becomes thinner and loses collagen.

Fat compartments change, and facial bones gradually remodel. The eyebrows may also sit lower than they once did.

This matters because some people increasingly use their forehead muscles to support their eyebrows. If I completely relax that forehead, they may develop heaviness around the brows or eyelids.

Therefore, I may deliberately use less toxin. To the patient, that can feel as though their Botox is no longer as strong. In reality, the dose has been adapted to their anatomy.

That is good medical treatment. I often tell patients that we should not treat a 50-year-old face using exactly the same plan we used at 35.

Facial muscles, brow position and wrinkles naturally change over time.

Botox cannot treat every wrinkle

This distinction is crucial. Some lines are primarily caused by muscle movement. We call these dynamic lines.

For example, you might see forehead lines when raising your eyebrows but not when your face is relaxed. Botulinum toxin can work extremely well here because it reduces the muscular movement creating those lines.

However, over time, dynamic lines can become visible even when the muscle is relaxed. At that stage, other factors become important.

• Collagen loss
• Skin thinning
• Cumulative sun exposure
• Reduced elasticity
• Dehydration
• Changes in skin texture

Botox may still be working perfectly on the muscle underneath. However, the skin above it may no longer spring back as it once did.

As a result, someone sees the remaining line and concludes that the Botox has failed. It hasn’t necessarily failed at all.

This is one reason treatment often needs to evolve beyond Botox alone. Depending on the person, improving skin quality may require medical skincare, laser resurfacing, skin boosters or collagen-stimulating treatments.

When Botox appears less effective, sometimes the bigger change is actually happening within the skin.

Does the Botox dose matter?

Absolutely. However, more Botox does not automatically mean better Botox.

When treating a younger face, stronger muscle relaxation may be tolerated extremely well. Later, that same dose could create heaviness.

Therefore, an experienced doctor may deliberately reduce the dose or alter where the injections are placed. Additionally, patients sometimes change clinic or practitioner.

The new doctor may use a different dose. They may also use a different product or treatment philosophy. Consequently, treatment may feel different even though both approaches are medically reasonable.

This is why telling a new practitioner, “I normally have 40 units,” does not necessarily give us the whole story.

Botox units are not interchangeable

This causes considerable confusion. People commonly use the word “Botox” to describe every botulinum toxin treatment.

However, Botox is actually one particular brand. Several botulinum toxin type A products are now available.

At Riverbanks Clinic, our treatment options include Botox, Azzalure and Relfydess. Importantly, their units are not directly interchangeable.

Therefore, 40 units of one toxin cannot automatically be compared with 40 units of another. This becomes particularly relevant when patients change clinic or product.

A different number of units does not necessarily mean you have received more or less treatment. What matters is the appropriate dose of that particular medicine for your anatomy.

At Riverbanks Clinic, injectable treatment starts with medical assessment rather than a standard injection map.

Read more about Botox and anti-wrinkle injections at Riverbanks Clinic

Does exercise make Botox wear off faster?

Patients ask me this surprisingly often. There has been discussion about whether very high levels of physical activity influence botulinum toxin duration.

However, I don’t think the current evidence is strong enough to tell someone that exercise definitely makes Botox wear off faster.

What we do know is that duration varies between individuals. Muscle strength, treatment area, dose, product and individual biology may all contribute.

Therefore, if your Botox lasts ten weeks while your friend’s lasts four months, that does not automatically mean something is wrong. We are treating humans, not identical machines.

Can you become resistant to Botox?

Yes. However, this is where we need to separate possibility from probability.

Botulinum toxin is a biological protein. Therefore, the immune system can potentially recognise it and produce antibodies.

Some of these antibodies may neutralise the toxin. If that happens, treatment can gradually become less effective. In genuine resistance, it may eventually produce very little effect.

This phenomenon is usually called secondary non-response. However, neutralising antibodies appear to be uncommon.

A 2023 meta-analysis examined 5,876 evaluable people treated with onabotulinumtoxinA across several medical and aesthetic indications. Only 27 developed neutralising antibodies.

That was approximately 0.5%. Furthermore, only five were considered secondary clinical non-responders.

Therefore, we should not assume everyone whose Botox lasts less time has developed antibodies. Those studies also include medical indications where substantially larger doses may be used.

In my own clinical practice, genuine resistance has been exceptionally unusual.

Can frequent Botox increase resistance?

Potentially. This is one reason I am cautious about treating people more frequently than necessary.

An international expert review on botulinum toxin resistance identified immunogenicity as an important consideration. Factors such as total protein exposure, dose and treatment frequency may influence antibody development.

This also matters when we talk about Botox “top-ups”. Some patients have come to believe that every Botox treatment automatically includes another injection two weeks later.

I don’t agree with that approach. A two-week review is a review.

If something genuinely needs adjusting, we can assess it. However, if the treatment looks good, why inject more toxin?

Similarly, some patients want another treatment at the very first sign of returning movement. Again, that may not be necessary.

I prefer patients to get appropriate longevity from their treatment rather than returning more frequently than needed.

What does true Botox resistance look like?

If your Botox previously lasted four months and now seems to last three, I would not immediately diagnose resistance. Likewise, seeing a few lines earlier does not prove antibodies have developed.

True secondary non-response becomes more convincing when someone previously responded normally but develops progressively reduced muscular relaxation despite appropriate treatment.

Even then, we need to consider other possibilities.

• Insufficient dose
• Inappropriate injection placement
• Changing product
• Treatment technique
• Product handling
• Changes in anatomy
• Unrealistic expectations

Therefore, I want to understand the complete treatment history before concluding that someone has become resistant.

What about newer longer-lasting toxins?

This is where things have become particularly interesting. For many years, patients became accustomed to expecting around three to four months from botulinum toxin treatment.

However, newer formulations may provide longer duration for some patients. One example is Relfydess, or relabotulinumtoxinA.

Relfydess is a ready-to-use liquid botulinum toxin formulation. I started using it relatively early after its UK launch and have now accumulated considerable clinical experience with it.

The Phase III READY-1 trial studied Relfydess for moderate-to-severe glabellar, or frown, lines.

The results are interesting. Firstly, onset can be rapid. Around 39% of patients reported seeing an effect from Day 1.

However, it is the duration data that I think patients find particularly interesting. At Month 6, 58.1% still demonstrated at least a one-grade improvement from baseline on investigator assessment.

There is another way of looking at those results. The Kaplan–Meier analysis examined how long it took patients to return to their original baseline severity.

“75% … did not return to baseline within 6 months.”

That figure relates specifically to patients treated for glabellar lines. It was based on concurrent patient and investigator assessments at 169 days.

In other words, three quarters of the assessed patients had still not returned to where they started approximately six months after treatment.

That is slightly different from saying 75% were completely wrinkle-free at six months. They weren’t.

It means their frown lines had still not returned to their original baseline severity. That is an important distinction.

For lateral canthal lines, or crow’s feet, the equivalent figure was 64%. The published READY-1 study also reported that the median time to return to baseline was beyond the six-month study period.

However, this still does not mean that every patient will get six months from Relfydess. People respond differently.

It also does not mean that everyone whose existing Botox seems short-lived should automatically switch. We first need to understand why the previous treatment seems less effective.

Read: Relfydess vs Botox – What the Latest Research Reveals About Both

Should you change toxin if your Botox wears off quickly?

Possibly. However, product choice is only one part of the assessment.

If the apparent loss of effectiveness comes from changing anatomy, skin ageing or inappropriate dosing, changing toxin alone may not solve it.

Conversely, some patients may benefit from a different formulation or duration profile. Therefore, I would first establish why your previous treatment seems different.

That is much more useful than simply chasing a stronger or longer-lasting toxin.

What should you do if your Botox isn’t lasting?

The most useful thing you can do is look at the pattern. Ask yourself:

• Did the treatment work properly initially?
• How quickly did it start working?
• When did you first notice movement?
• Is the muscle actually moving strongly again?
• Or are you mainly noticing lines within the skin?
• Has your dose changed?
• Have you changed practitioner?
• Have you changed toxin?
• How frequently are you being treated?

Then discuss those observations with your doctor. I would much rather understand why your treatment has changed than simply increase the dose.

Botox treatment should evolve with you

This is probably the most important message. Botox does not exist independently of the face we are treating.

Your facial anatomy changes. Your skin changes. Your muscle strength changes. Your priorities may also change.

Therefore, a good treatment plan should evolve too.

Sometimes that means altering the dose. Sometimes it means changing the injection pattern. Sometimes another botulinum toxin may suit you better.

And sometimes Botox is working perfectly well, but the skin itself now needs treatment.

That is why the consultation remains more important than the injection.

At Riverbanks Clinic, our injectable treatments are doctor-led and based on facial anatomy, medical assessment and individual treatment history.

We see patients from Harpenden, St Albans, Luton and across Hertfordshire.

If your Botox seems to be wearing off more quickly, don’t automatically assume that you have become resistant. Let us work out what has actually changed.

Book a consultation at Riverbanks Clinic

Alternatively, call 01582 762877 or download the Riverbanks app.

You can also explore our approach to treatment here:

• Botox and anti-wrinkle treatments at Riverbanks Clinic
• Relfydess vs Botox: What the Latest Research Reveals About Both

Scientific references

Jankovic J, et al.
Neutralizing Antibody Formation with OnabotulinumtoxinA Treatment from Global Registration Studies across Multiple Indications: A Meta-Analysis.
Toxins. 2023.
Read the study on PubMed

Ho WWS, et al.
Emerging Trends in Botulinum Neurotoxin A Resistance: An International Multidisciplinary Review and Consensus.
Plastic and Reconstructive Surgery – Global Open. 2022.
Read the study on PubMed

Shridharani SM, et al.
Efficacy and Safety of RelabotulinumtoxinA: Results From the READY-1 Double-Blind, Randomized, Placebo-Controlled Phase 3 Trial in Glabellar Lines.
Aesthetic Surgery Journal. 2024.
Read the READY-1 study on PubMed

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