Dysport is a neuromodulator made with a controlled amount of purified botulinum toxin, just like Botox. It is possible to be allergic to this protein, though it is quite rare. The manufacturer’s box warning states that there is a slight risk of allergic reaction or spreading of the drug, which could result in difficulty swallowing, difficulty breathing, or other potentially serious complications. Again, this rarely happens. In the uncommon instances that it has, prompt medical attention has reversed the reaction quickly.
The most common side effects that are associated with Dysport injections include minor headaches, temporary redness and swelling at injection sites, and mild bruising or discoloration. These side effects usually last no more than a few hours. However, they can last up to a few days.