Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe stomach pain, diarrhea that is watery or bloody;
tremors, twitching, or rigid (very stiff) muscles;
a seizure (convulsions); or
unusual changes in your mood or behavior.
Common side effects include:
nausea, vomiting;
diarrhea;
headache; or
pain, redness, or mild swelling where the injection was given.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Ertapenem side effects (more detail)
