I wouldn't take it. The research of the chemical itself in regards to its purported benefits is a little
disconcerting. Not that it's dangerous, just a little useless. Just call your doctor and ask if you can stop cold. That is if you want to stop taking them at all, though.
Some good things to combat depression would be depression medication and talk therapy, a better diet, and normal over-the-counter multivitamin and multi mineral supplements. And read more if you need better concentration. Whenever I stop reading for any long amount of time I feel brain-zapped.