How about 1 day withdrawal period with flubenvet? It wont kill tapeworms though. I doubt your birds have tapes, you'd easily see the segments in the feces.
http://www.twincitypoultrysupplies.com/store/index.php?main_page=product_info&products_id=584
http://www.twincitypoultrysupplies.com/store/index.php?main_page=product_info&products_id=584
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