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Since 2016, approvals have changed. Now piperazine is no longer approved, and no loss, given it's limited usefulness. Fenbendazole is approved now, no egg withdrawal, and is a very good product. Approvals are related, in part, to maintaining the usefulness of drugs used in humans. Very low...

It's not approved for use in poultry, so there's no known egg withdrawal period. Piprazine is the only approved wormer, and it only treats roundworms. Mary