Gapeworm treatment?

[NeeNee Hen]

I have 2 out of 11 backyard chickens (pekin and d’Uccle) with suspected Gapeworm. Neck stretching and yawn behaviour with lethargy. I have used ‘Fluverm’ Active constituent 50mg/g flubendazole for 7 days but they are still doing the neck stretch and yawn. Any suggestions out there about what to do?

 

[nuthatched]

Are you sure they aren't just adjusting their crop? It's normal for them to do that and gapes are uncommon.

 

[coach723]

How lethargic are they? What do their droppings look like? Are they eating and drinking normally? How old are they?