This has been happening to me too. It really is annoying, but after researching pretty extensively I've come to the conclusion it's probably not med related (I am on anti-psychotics which can cause movement disorders, but AP-related muscle twitches are in different locations and at a different intensity than the eye and leg twitches involved in what's called "Benign fasciculation syndrome"--eyelid twitches being one of the most common manifestations of this). I've come to the conclusion my eyelid and leg twitches are probably caused by a combination of caffeine, stimulant ADD medication, and possibly low magnesium and calcium. I'm supplementing the magnesium and calcium now and cutting back the caffeine a little bit. Hopefully that will get rid of the annoyance.