Question: is tagamet a proton pump inhibitor?
Answer: Tagamet is a histamine receptor antagonist and Nexium is a proton pump inhibitor (PPI). Both Tagamet and Nexium are available over-the-counter (OTC) and as generics. Side effects of Tagamet and Nexium that are similar include headache, dizziness, drowsiness, diarrhea, nausea, or constipation.