In the US one can still eat meat and eggs from birds treated with any wormer if they follow appropriate withdrawals. One can have their vet submit a withdrawal request:Just remember the Wormout Gel is not intended to be used on birds you are going to be eating. The egg with holding period is 10 days when used on poultry.
http://cafarad.ucdavis.edu/farmweb/FARADRequest.aspx?showConcentration=yes