Actually a serious side effect from Zantac is loss of appetite.
"Gastrointestinal side effects have included constipation, nausea/vomiting, diarrhea, abdominal pain, and rare reports of pancreatitis. Rebound acid hypersecretion has been reported after discontinuation of therapy. A case report of coinfection with Giardia lamblia and Clostridium difficile has been attributed to the achlorhydria induced by ranitidine (the active ingredient contained in Zantac) predisposing the patient to the enteric infection."
- Zantac Information for Consumers
- Zantac Information for Healthcare Professionals (includes dosage details)
- Side Effects of Zantac (detailed)
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