My hen has had bubbly discharge coming from her eyes, sneezing, and congestion even after eight days on Duramycin 10 in her waterer. Do I have to wait for the Duramycin 10 to leave her system before I can try Tylan 50-injectable orally? What kind of syringe can I use to give it to her orally? (I'm not good with needles). What is the best method to give the antibiotics to her? I've seen people shove the entire needle-less syringe down their esophagus before, while others just tilt it to the inside of their mouths and gradually give it to them.