If your symptoms do not improve within a few days, or if they become worse, check with your doctor.

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Stop taking ZITHROMAX and get emergency help immediately if any of the following side effects occur :

• More common (for injection form only)
  • Pain, redness, and swelling at site of injection 
  
  

• Rare
  • Abdominal or stomach cramps or pain (severe);  abdominal tenderness;  diarrhea (watery and severe, which may be bloody);  difficulty in breathing;  fever;  joint pain;  skin rash;  swelling of face, mouth, neck, hands, and feet 
  
  

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

• Less common
  • Diarrhea (mild);  nausea;  stomach pain or discomfort 
  
  

• Rare
  • Dizziness;  headache 
  
  

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.

Once a medicine has been approved for marketing for a certain use, experience may show that it is also useful for other medical problems. Although these uses are not included in product labeling, azithromycin is used in certain patients with the following medical condition:

• Trachoma (treatment)

Other than the above information, there is no additional information relating to proper use, precautions, or side effects for this use.