I received Dysport and 20 hours later was sick with nausea and vomiting. How long will it last?

Thanks for your question- 
While many medications list a mountain of possible side effects etc, the list in reality of Dysport is very small. The difference is that Dysport is not absorbed systemically like the medications we take by mouth. This is a huge difference and likely the reason why I believe you picked up a GI bug randomly. 
I would treat this like a normal GI bug and not think that it had anything to do with your treatment. If you have any doubts or questions, please contact your injector. 
Hope this help and God Bless! 
Dr. Robb

Thank you for your question about nausea and vomiting after Dysport.I am so sorry that you have been ill.  The good news is, it is highly unlikely that Dysport is the cause of your symptoms of nausea and vomiting.  If your symptoms persist, you should likely follow up with your primary care provider or walk-in clinic.  To be sure, see two or more experienced,
licensed and board-certified providers in your area for a complete evaluation
to make sure you are a good candidate and that it is safe for you to have
treatment.
I hope this helps.