Chapter 50: Acid-Controlling Drugs

Understanding this foundation is essential for recognizing how acid-related pathologies such as gastroesophageal reflux disease, peptic ulcer disease, gastritis, Zollinger-Ellison syndrome, and Helicobacter pylori infections develop and progress. The chapter then systematically presents four major therapeutic approaches. Antacids function through chemical neutralization using aluminum, magnesium, calcium, or sodium salts, yet their use carries significant adverse effects including constipation, diarrhea, metabolic alkalosis, nephrolithiasis, and rebound acid hypersecretion that limit long-term effectiveness. Histamine-2 receptor antagonists such as cimetidine, famotidine, and nizatidine operate by competitively blocking histamine binding sites on parietal cells, thereby suppressing acid secretion with generally favorable safety profiles. Proton pump inhibitors including omeprazole, lansoprazole, pantoprazole, esomeprazole, and rabeprazole represent the most potent class, irreversibly inhibiting the hydrogen-potassium-ATPase pump to achieve profound acid suppression and serve as first-line therapy for severe acid disorders and Helicobacter pylori eradication regimens. Adjunctive agents like sucralfate provide direct mucosal protection through ulcer coating, misoprostol prevents nonsteroidal anti-inflammatory drug-induced injury via prostaglandin mechanisms while presenting significant obstetric contraindications, and simethicone reduces abdominal gas discomfort through mechanical action. The chapter emphasizes adverse effect monitoring, including long-term proton pump inhibitor concerns such as bone demineralization, altered mineral absorption, and increased infection susceptibility. Critical nursing considerations encompass baseline assessment of renal and hepatic function, identification of significant drug interactions particularly between antacids and fluoroquinolone antibiotics, reinforcement of medication adherence strategies, implementation of lifestyle modification counseling, and vigilant recognition of warning symptoms including gastrointestinal hemorrhage. Special attention to stress ulcer prophylaxis in critically ill populations and patient-centered education regarding appropriate self-medication completes the clinical framework.