What is the Likelihood of an Allergic Reaction to Juvederm after a Reaction to Botox?

Botox is onabotulinum toxin type A (a form of neurotoxin) and Juvederm is made from hyaluronic acid ( a form of tissue glue found throughout the body).  These are chemically dissimilar, achieve different effects, and are used for different purposes.  There should be no cross antigenicity between these products, which are both made by Allergan.

Botox and Juvederm are completely different products with different chemical structures.  Being allergic to one product will not make you allergic to the other.  If you have concerns, you can have a small test site injected with either product.