Chapter 39: Acid-Controlling Drugs – GERD & Ulcer Management

Chapter 39 details the pharmacological management of gastric hyperacidity and related conditions, such as Peptic Ulcer Disease (PUD) and Gastroesophageal Reflux Disease (GERD), which result from an impairment in the balance of gastric secretions, notably the overproduction of Hydrochloric Acid (HCl) by the parietal cells. Treatment involves four primary drug categories. Antacids operate by chemically neutralizing existing gastric acid and enhancing mucosal protective factors like mucus and bicarbonate. Because antacids interfere with the absorption of many other medications—via mechanisms like chelation or altering GI pH—they must be strictly administered 1 to 2 hours before or after other drugs, especially quinolone antibiotics, whose absorption can be reduced by over 50%. The second class, Histamine-2 (H2) receptor antagonists (such as ranitidine and famotidine), reduce acid secretion by competitively blocking the H2 receptors on parietal cells, making these cells less responsive to all major stimulants (histamine, acetylcholine, and gastrin). The most potent class, Proton Pump Inhibitors (PPIs), including omeprazole and pantoprazole, provide nearly total acid suppression by irreversibly binding to and inhibiting the hydrogen-potassium-ATPase pump—the final step in the acid secretion process. PPIs are often first-line therapy for erosive esophagitis, severe GERD, and are combined with antibiotics for Helicobacter pylori eradication. However, long-term PPI use requires careful assessment due to documented concerns about increased risk for bone fractures, Clostridium difficile infections, chronic kidney disease, and magnesium depletion. Miscellaneous agents include sucralfate, a mucosal protectant that binds to ulcer bases to form a protective liquid barrier; misoprostol, a prostaglandin analogue used primarily to prevent NSAID-induced ulcers but strictly contraindicated in pregnancy; and simethicone, an antiflatulent used to alleviate gas discomfort by breaking down mucus-coated gas bubbles. Nursing care focuses heavily on patient assessment for kidney and liver function, identifying potential drug interactions, and instructing patients on proper administration timings, such as giving PPIs before meals and avoiding magnesium-based antacids in patients with kidney failure.