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You're speaking to Dr. Michael Salkin. Welcome to JustAnswer. I'm currently typing up my reply.
I'm sorry that your question wasn't answered in a timely manner. We don't have many avian vets on this site. Please let me know if you still need help. There are no studies of escitalopram (Lexapro) in birds and so I can't know how this drug would affect Mittu. Overdoses in dogs can cause sedation, incoordination, tremors and seizures. There's no specific antidote to escitalopram and so any symptoms would be treated symptomatically and supportively by an avian vet (please see here: www.aav.org).
May I have an update on Mittu, please?