Could i have postpartum depression even if i am already taking lexapro (escitalopram)?

Yes: Just because you are taking medication for depression, it does not mean you can not feel depressed. Your dose may not be sufficient, you may need additional treatments including meeting with a psychologist to discuss your symptoms. Sometimes, medications can give you the opposite effects and by itself can make you more depressed. You may want to check your serotonin, epinepheine and norepinephrine.

Yes: Even if you are taking an antidepressant such as Lexapro (escitalopram) as a preventative, it doesn't guarantee that you will not get postpartum depression. If you have symptoms of ppd, then talk to the prescribing physician to see if the dose needs to be adjusted or a different medication is needed. In addition if you are diagnosed with postpartum depression, consider adding psychotherapy as well.

Ppd: Lexapro (escitalopram) could have been stabilizing your depression but it would not necessarily prevent the added depression following labour/delivery.