Thank you for your question. It is essential for you to advise your treating practitioner of all your medications and any allergies you may have prior to your Dysport treatment. Currently, is no substantiated documented evidence to suggest Lexapro use as a contraindication for Dysport treatments. There there also no documented evidence to suggest that the efficacy of either medications is impacted by any interaction between the two. I would advise for you to consult with your treating doctor so that a comprehensive medical history can be taken and an appropriate medical assessment be performed prior to your Dysport treatment. It is also essential for you to attend all follow up reviews so that any post treatment concerns can be addressed. For further information on Dysport and possible side effects, please refer to the following web reference for the manufacturer's medication guide on Dysport.