Is there allergy testing for Botox?

Allergy testing is not commonly performed prior to Botox administration. However, given your risk for anaphalaxis, it is advisable to have your injector or allergist perform an allergy test using the botulinum toxin.

It appears to me that you may be experiencing side effects of Botox due to its ability to migrate (Google: "Botox side effects to see the full list). The tightening in your throat can be life threatening as Botox can paralyze the muscles allowing you to breathe. If you still have these symptoms you should immediately go to the nearest emergency room.      jlr

While true allergies to neuromodulators like Botox are uncommon, they have been reported.  Although I have not heard of any allergists testing specifically for allergies to this substance, it should not be that difficult to achieve provided they can obtain the product for testing.  Be aware that if you have a true allergy to Botox you could have a cross reaction/allergy to Dysport and Xeomin as well.  I hope this helps.