Like Blackpup, when I get terribly depressed, I lose faith in my meds. I cannot understand how I can still feel so down while I'm on meds that are supposed to make me feel better.
I was on just an anti-dep a while back (Before the BP dx) and I stopped 20mg Citalopram cold-turkey once. I just didn't feel they were helping my moods and they were seriously crashing my libido. I felt as sick as a dog though.
I've also been on Sodium Valporate, which I also just stopped when I couldn't feel any benefits.

And on top of that, I tend to be very prone to ODing on meds, so I actually should never have any extra's at home.
I have recently "threatened" my T that I want to stop the Lamictin as I cannot notice much, if any, improvement.
But I do take my Lamictin religiously. Vitamins on the other hand - those are a bit of hit and miss if I remember or not, lol