Just in the interest of full disclosure, and not of particular interest to you as you are not dealing with a hen, ivermectin and praziquental or not FDA approved meds for laying hens, nor meat birds.
If you use "off label" you can't technically use that bird for eggs or meat....or you follow FARAD suggestions and pull eggs or meat for a certain time, generally 14 to 30 days.
But you are dealing with a rooster that is not meant for meat, if I understand you correctly.
Just so you know. Most treat, treat again in the 10 to 14 days, then wait 14 to 30 days before processing or selling eggs. Both drugs are used in humans, and the amount is very small that you would get, but if your meat or eggs were ever tested and found to carry an non-approved substance, you could become liable for any FDA penalties.
Okay...PSA done.
LofMc