At the 4-6 week mark it kicks in, while the
side effects kick in unfortunately before the
effects do. We all get different side effects, mine were mostly a weird head pressure. But you've been on it a month, if this bad reaction continues much longer I'd just say, it's easier to stop these meds if you haven't been on them very long, so if you do determine this drug isn't for you better to stop it sooner rather than later. Good luck.