A mouse, 12cm without the tail, trapped in a space it can't escape from, has eaten about 8 packets of this product (blue) for 3-4 days. It turned out to be his favorite snack! He didn't suffer anything at all! until we finally caught it with an ~8€ trap and we calmed down. The only use I found for this "medicine" is to attract the mouse and nothing else. *I checked the freshly bought box, it wasn't expired.