Z-Pack and its generic form, Azithromycin, are available for purchase through various pharmacies, both online and in-store. When buying Zithromax or Azithromycin, especially online, it’s important to ensure that you’re purchasing from a reputable source to avoid counterfeit products. While Zithromax is generally well-tolerated, potential side effects can include nausea, diarrhea, abdominal pain, and, in rare cases, more serious reactions such as allergic responses or liver issues. It is crucial to consult with a healthcare provider before starting the medication to confirm that it’s appropriate for your specific infection and to receive guidance on the correct dosage and duration of treatment.