I took SSRI and SNRIs for almost 20 years and stopped taking them gradually, the latest of these being Abilify which I stopped in Nov. 2017 and Cymbalta which I stopped in February 2018. I understand that the brain has to relearn how to transport serotonin once you no longer take these type of antidepressants. My question is how long does it take for the brain to re-develop new pathways to deliver serotonin naturally? Do any of you know of any articles, particularly scientific studies, that address this issue? I am dealing with irritability and some low grade depression in the meantime and look forward to a time when it resolves. Thank you for your time and efforts on my behalf.