Get emergency medical help if you have signs of an allergic reaction to Zantac: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using Zantac and call your doctor at once if you have:
stomach pain, loss of appetite;
dark urine, jaundice (yellowing of the skin or eyes);
fever, chills, cough with mucus, chest pain, feeling short of breath;
fast or slow heart rate;
easy bruising or bleeding; or
problems with your skin or hair.
Common Zantac side effects may include:
nausea, vomiting, stomach pain; or
diarrhea, constipation.
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.
 Zantac side effects (more detail)
