You should give the wormer orally with a needle less syringe. You should be able to get a regular syringe from Tractor Supply or an oral dosing syringe from a pharmacy. Or you can buy them online.
-Kathy
If you bought Wazine, take it back and get some Safeguard liquid for goats instead. Wazine only gets roundworms and if I had a hen like your hen I would want to rule out capillary worms and would treat her with Safeguard for five days. Dose for an average size RIR would be 1.5ml by mouth once a...