Hello, My Female Cockatiel, BooBoo gags and sputters for over an hour when I give her Doxycycline. She has an infection in her nasal cavities causing her to wheeze badly at night. We did a culture exam after a nasal flush. The medication is working but her reaction after taking the medicine is bad. After taking it she seems to have a hard time breathing. Her head goes up in the air as if she is trying to swallow but can't. Her doctor is lost for a solution as to this problem.