1. H2 Blockers. U.S. National Library of Medicine. https://medlineplus.gov/ency/patientinstructions/000382.htm 
  2. Histamine H2 Antagonist (Oral Route, Injection Route, Intravenous Route). Mayo Foundation for Medical Education and Research. https://www.mayoclinic.org/drugs-supplements/histamine-h2-antagonist-oral-route-injection-route-intravenous-route/description/drg-20068584 


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