Lexapro - When will emotionally numbness leave?

Hi, Kathy!
Fortunately, side effects generally resolve over a few days to a week or two and rarely cause cessation of treatment. It would be a good idea to half your dose as this will let your metabolism adjust more smoothly to the medication. Then if needed you can increase your dose back up to a more therapeutic level.
Hang in there... all this will pass soon enough and I think you'll find that your time and efforts will help improve your quality of life.
You don't say if you're taking it for depression or anxiety or both but Lexapro is an excellent choice of medications. I took it for over seven years until it "pooped out" because of long term use.
Best regards and you'll be feeling better before you know it.
Wildcat