HomeoPet WRM Clear does not kill the worms; it gently creates and environment in the body that the worms can no longer live in, thereby flushing them harmlessly from the body. It takes 2 weeks for the product to reach its maximum potential in the body. During this time you may see live worms in the stool. Seeing live worms is a good indication that the product is working. You may continue to see worms coming out for up to 4 weeks after the last dose, and this is because it takes that long for worm eggs to hatch. The effect of the product remains active in the body for up to 2 months after the last dose, thus inhibiting re-infestation within that time period in spite of contact with worms.