How did that amount make you feel? Are you talking about redosing while you still feel the affects of the previous dose or several hours later? If several hours later when it wore off the same amount is what I would do and if you don't get the desired effect you can take a little more after about 30min or so. Better to take more a little bit after than taking to much at one time. At least that's how it went for me. But everyone is different.
