My peafowl hen has been gasping with her beak wide open and developed a gurgling wheezing sound. From everything I decided to treat for gapeworm. I bought Safe-guard (flenbendazole) dewormer for cattle. I gave her 2 cc syringe down her throat. My question is..... Do you I only treat once or should I treat again later?? How long does it take to see a result? There seems to be a lot of opinions on what to treat with but I have not seen anything about how long for results. Thank you in advance for any help.