I found this:Are there any side effects associated with Zithromax? Zithromax side effects may include abdominal pain, diarrhea or loose stools, and nausea or vomiting. If the side effects continue or are bothersome, check with your doctor. Less common Zithromax side effects may include blood in the stools, chest pain, dizziness, drowsiness, fatigue, gas, headache, heart palpitations, indigestion, itching, jaundice, kidney infection, light sensitivity, rash, severe allergic reaction including swelling (as in hives), vaginal inflammation, vertigo, and yeast infection. Other uncommon Zithromax side effects sometimes seen in children include agitation, constipation, cough, facial swelling, feeling of illness, fever, fungal infection, insomnia, loss of appetite, nervousness, overactivity, pinkeye, runny nose, shortness of breath, sore throat, stomach inflammation, and sweating. Dave 29 w/cf