I would give him 1cc for every 10lbs twice a day for at leat 4 to 5 days. Both times I had to do it my birds were much better after 3 days and after a week i stopped treatment. It will recur so be prepared. Once a bird has resp issues it will clear up but the next cold snap or wet weather may rear its head again. Keep a close eye on the birds and get tehm used to you being close. Whenever we have nasty weather for a few days i go grab my tom, generally at night on the roost and pull his head close to my ear to listen to his breathing. if is is raspy then break out the tylan.