upper respiratory tract infection
"I was prescribed 250mg, 5 day dose pack of Azithromycin for upper respiratory infection. Dosing: 2 tabs 1st day, then 1 per day for 3 days.  Took 2 tabs 1st day no problem.. 2nd day, 1 tab in morning before driving to family reunion. Almost immediate intermittent left upper chest painb.  No other symptoms of heart attack.  Chewed 2 aspirin after lunch - only slight relief. Returned home in evening and found Cardiac symptoms listed on dose pack descriptions.  Discontinued taking Azithromycin and had no recurrence of chest pains 3rd day to date. Ten days later I had electrocardiogram down and results were normal."