Common Side Effects


Like all medicines, Zmax may cause some side effects. Side effects in Zmax clinical studies were generally mild to moderate. The most common side effects include1:

  • Diarrhea/loose stools
  • Nausea
  • Stomach pain

For patients who took Zmax and got diarrhea, most cases of diarrhea went away by Day 2.


Less Common Side Effects


Other, less common, side effects reported with Zmax are:

  • Headache
  • Vomiting

Patients who vomit within the first hour of taking Zmax should contact their doctor.1


IMPORTANT: Allergic Reactions May Occur


Zmax is not for patients who have allergies to some antibiotics. You should always tell your doctor if you have allergic reactions to medicines.

Get emergency help right away if you:

  • Have hives, trouble swallowing, or your face or throat swells after taking Zmax
  • Have wheezing or trouble breathing after taking Zmax

These symptoms could go away and then come back.


IMPORTANT: Watch for Severe Diarrhea


A small amount of diarrhea may be common with most antibiotics. But diarrhea that does not go away can be serious. Call your doctor right away if you have diarrhea that does not go away, is severe, watery, or has blood in it.


For a list of all side effects reported with Zmax, ask your doctor or pharmacist.