 [ Symptoms ] my 15mo son walks and plays normally then will suddenly have an issue with leg will not put any weight on it i took him to er and had his hips xrayed they said there were no problems with the bones this has been going on for a lil over a week he is not running fever or have any other illness he is not allergic to anything [ Disease ] yes azithromycin is chemically similar to erythromycin the primary antibiotic in augmentin is penicillin based amoxicillin they are two very different antibiotics some unfortunate people are allergic to both