Weirdly enough, 0.5mg is my personal nemesis. All told, thrown up three separate times and gagged badly enough that I needed a bin or the bathroom nearby more than ten separate times. Zero problems at 0.25, 0.75, 1, 1.7, or 2.4mg. But that 0.5 amount wrecked me every time. Went back on it after a thirteen-month break for an unrelated medical reason, and once again the 0.5mg is making me want to quit and drop back to 0.25 permanently.