I don't care what the trouble is, going off your anti-psychotics when you know you need them and will attempt to KILL if off them, is one of the most irresponsible things an adult does in the series.

I can see where you're coming from, but this seems a bit harsh. Remus was really caught between a rock and a hard place. He had evidence that three students were being dragged off into an isolated location by a murderer (whether he thought that murderer was Sirius or Peter). I kind of read it as him acting to save the kids immediately, and planning to get the Wolfsbane afterward. (After all, how much time would've been wasted if he'd gone looking for Snape first?) Unfortunately, as events unfolded he simply ran out of time. I honestly can't blame him for that decision -- moonrise was a ways off, but the kids were in mortal danger (he thought) at that very instant.

I tend to condemn him much more for hiding his knowledge of Sirius' animagus abilities and form, as well as the secret passages into the castle. That was a year long series of very dangerous (were Sirius truly the murderer everyone thought) lies of omission. Not taking the potion that one night seems to me more a matter of being forced to choose the lesser of two evils at a moment of crisis.