After you've treated
Following treatment, residual liver fluke eggs can be shed in dung for up to three weeks. If possible, keep the animals in quarantine, or at least on the driest ground available, until this time has elapsed.
You can confirm the treatment has worked by collecting dung samples for coproantigen testing two weeks after triclabendazole treatment. These can be tested for eggs or for coproantigen (a substance released by live fluke as they feed).