Can I Have a Reaction to Dysport but Not to Botox?

The issues you are describing represent a systemic reaction to Dysport. Was this treatment done by the same physician? Was there a reason your Doctor decided to switch you to Dysport. While the two drug are both Botulium toxin A, they are not bioequvalent. It sounds like you got too much Dysport. This happens when physician first start working with Dysport. They may start with a "recommended" formula for converting between Botox and Dysport. However because each physician injects in a truly unique way, there is no fix formula. Your doctor will never tell you but it is likely that you are among his first few patients treated with Dysport. Please let your doctor know about your reaction. It is likely that you can successful return to treatment with Botox. I would also encourage you to always know what the total dose of product is being used for your treatment. Note that units of Botox and units of Dysport are not interchangeable.

It is possible that the reaction you had to Dysport was from some product entering a blood vessel, which can happen. The same could happen with Botox.  Either Botox or Dysport might be needed in the forehead above the raised eyebrow to help bring it down further.

Botulinum toxin type A is the active molecule in both Botox and Dysport. They are both purified from natural sources, but the molecule is encased in other protein molecules, some of which have been removed in Dysport, while the entire natural "complex" is present in Botox. Because these proteins must dissolve away to release the active one, Dysport may do this a bit sooner. There is nothing in Dysport that isn't in Botox though so a reaction to one and not the other seems very unlikely.

Dysport and Botox both contain the same "active ingredient"- botulinum toxin type A.  You are describing symporotms that my be related to the dose of the drug administered rather than a problem with the drug itself.  It is difficult to make direct comparisons, but knowing the dose of each drug used would be helpful when trying to sort out why you may have responded well to one but had problems with the other.

Dysport and Botox are both botulinum toxin A but they are slightly different molecularly.  Dysport units are different then Botox units, and hence the dose you received for Botox would have to be converted or titrated to Dysport units to achieve the same results.  The conversion to Dysport units is based on a formula, but there may be some titration required to give you the same effect.  The reaction you describe may potentially be from too high a Dysport dosage from improper conversion or titration.  Notify your doctor about this reaction.  Regarding the elevation of the eyebrow, this may be from your doctor not placing enough Dysport over the region of the overly raised eyebrow.  The nuances of Botox and Dysport administration require experience and a first-hand knowledge of the facial musculature.  Hope this information helps.