Ranitidine (Zantac)

Photograph of Ranitidine
 under the microscope.

Ranitidine acts as a competitive inhibitor of histamine at the histamine H2-receptors, including those receptors on the gastric cells, making it an effective antacid. Drugs of this type are typically used to treat both duodenal and gastric ulcers. In over-the-counter strengths, ranitidine is used to relieve heartburn, acid indigestion, and sour stomach. Side effects include headache, agitation, dizziness, and nausea.

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