depression
"I've been taking variants of this medication for the last 17 years, moving to the XL version when it became available to me as it causes less issues with being able to get to sleep.  It is absolutely essential to my quality of life, with the XL version giving me less exposure to the side effects of a missed day of medications as well.  It took about 3 months for the "built up" effect to really work, where it had residual effect for a couple days.

My point is, that if you haven't taken this medication for some reason, and you have depression, talk to your doctor about it.  It has made all the difference in my life from the time I was 13 to 30."