I had a couple of coughing chickens and got an antibiotic from the vet. Now it seems that one chicken stops coughing and two more start. It has now made its way back to the first chicken. I bought this from the feed store and have read a million (I exaggerate) posts about dosage. All my chickens act fine and eat and drink. About 4 sneeze occasionally, and my rooster sounds congested when he tries to crow.