Here are some Common side effects are:
Diarrhea or loose stools; headache; mild stomach pain; nausea; upset stomach; vomiting.
Seek medical attention right away if any of these SEVERE side effects occur when using Zithromax:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue; unusual hoarseness); bloody or watery stools; changes in hearing or hearing loss; chest pain; eye or vision problems; irregular heartbeat; muscle weakness; pain or inflammation at the injection site; pounding in the chest; red, swollen, blistered, or peeling skin; ringing in the ears; seizure; severe or persistent diarrhea; stomach cramps or pain; symptoms of liver problems (eg, yellowing of the skin or eyes; dark urine; pale stools; severe or persistent nausea, vomiting, or loss of appetite; unusual itching); trouble speaking or swallowing; unusual vaginal itching, odor, or discharge
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