azithromycin 500 mg

Older adults may be more likely to have side effects on heart rhythm, including a life-threatening fast heart rate. Common Zithromax side effects may include: diarrhea; nausea, vomiting, stomach pain; or. headache. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. isosorbide dinitrate 5 mg