Dysport & Botox Only Lasting a Month, Why Is That?

  I agree that the duration of the effect of these agents are dose dependent.  Not all Crow's feet are the same and here in Florida I can see patients with VERY extensive (long) and deep rhytids (wrinkles).  I believe that most patients require AT LEAST 10-15 units per side depending of the severity of the problem.  So yes.  You might not be getting enough units injected.  This is something that only your doctor can answer.  Ask him and/or consider seeking out another provider.

Dysport and BOTOX last about 4 month max.  In my experience, if you have a spectacular result from these services, you will begin thinking about getting more treatment as soon as the maximum treatment effect begins to soften which is about 2 1/2 months.  When a service disappears faster than this, it is generally because not enough treatment was used to begin with.  BOTOX and Dysport are not bioequivalent and they are not biosimilar.  This means that your treating doctor has to experiment a bit to learn what dose to use with the Dysport to get a treatment effect that is similar to what you experience with BOTOX.  It is not as simple as applying a conversion factor and saying OK, she was good with 10 units of BOTOX so she needs 2.7X10=27 units of Dysport.  It is likely that your treating doctor in an abundance of caution did not use enough Dysport on your last treatment.