Eldepryl

My loved one has been taking Selegiline for two years, as an add-on to Sinemet. Recently his neurologist prescribed Lexapro. He took it for a week and was not doing well at all. I Googled the two meds and they seem to interact badly with one another. Has anyone else taken both? I don't know why a movement disorder specialist would prescribe both if they are contraindicated.