You can also try taking pyrantel at different times. Andreas Kalcker suggests to take with breakfast. It might work. I have taken it in the evening on empty stomach and it was a total failure. I got more hits when I did it early morning. And better to do so with light food. If they taste only pyrantel i guess they just escape. I dont blame them, it tastes awful. Dose per box instructions. Unfortunately the pinworm med brand is full of additives. I have read that the combantrin pills or liquid are better but i would have to go to france to buy those.