If you are in the US, you can. Antidepressants are not on the list of medications that make you ineligible or require a waiting period. I have donated multiple times while taking antidepressants. Since most antidepressants require a dose to be built up over time, they won't affect people getting your blood. read more
I am currently on antidepressants, my doctor put me on them earlier this week, and my friends and I had planned to give blood next week - on this day I will have been on them for just over a week. read more