I don't know about Ativan, but I didn't have to crush my K in order to use it. I just left it to "dissolve" in the milk for 15 minutes. When I came back, there were no lumps or clumps, just orange milk. I think that's the key. If you're seeing stuff left over, you might need to crush. I am titrating Lexapro now and TRUST ME I know for a fact I can't get away with not crushing that tablet.