I took about half a bottle yesterday, and then another quarter, after about four hours. I had to take a second antihistamine, shortly after the first dose, which stopped the horrendous itching. Six hours after the second dose, I was sick, then I spent the rest of the night lying down, and feeling like I was dying. I have completely gone off codeine, and someone suggesting taking 500mg+ is just fucking irresponsible. Has anyone else been really ill off a large dose? Maybe I am just sensitive to it, but I've done plenty of linctus, and never felt so ill. Loads of anxiety, sweating, shaking, ringing ears, fucked up vision, constant twitches when trying to nod, but then a decent sleep, when I let it wear off. Horrible.