my ds1 (almost 6) keeps getting worms, I worm all 3 of us every 8-10 weeks, within a few weeks of being wormed he has them again, even doing a double up dose (worm then re-worm) he gets them back,

We are using the chocolate squares (where you take multiple) are there better options? he gets them, boom we all catch the bloody things, Im so over worms!