I have experienced mild visual effects from Calamus, much like the effects one have just after landing on LSD - slightly moving objects and a small tendency to breathing walls. Not much to speak of, in other words. This was from cold-water extraction of 20 grams. It did, however, cause extreme nausea and purging, I purged constantly through the entire night. I did not experience any distinct sedation to speak of, other than the fucked-up feeling of purging my guts out again and again. Understandably, I abandoned this herb, and can't today even smell it without feeling nauseas.