Can Botox Go Bad or Get Diluted?

Good studies have shown that the numer of units, regardless of the dilution, are the key to getting good muscle relaxation.  Botox that is more dilute will take more volume to get the same amount of muscle relaxation, but the added volume can compromise the accuracy of the injection by increasing the area of coverage or spread.  Know the number of units you are getting and where these units are injected.  If you aren't getting the desired result from Botox, I would recommend finding another injector.  Botox is incredibly reliable.

You should return to your doctor for him to see the result.  He would have a record of your treatment and the number of units used.  It is very rare for Botox to be ineffective or for you to stop responding to it, but it may happen.  You can either be injected again with Botox or try Dysport.