What two group of drugs are not used for acid peptic disease?

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two groups of drugs not used for acid peptic disease pharmacology

Based on my research from the medical library and pharmacology sources, I can now give you the definitive answer. This question comes directly from Indian pharmacology (KD Tripathi / similar exam-oriented pharmacology), which explicitly classifies antiulcer drugs and notes which groups are not used.

Two Groups of Drugs NOT Used for Acid Peptic Disease

The two groups are:

1. H1 Antihistamines

(e.g., diphenhydramine, cetirizine, loratadine, chlorpheniramine)

H1 antihistamines block H1 receptors (found in skin, airways, blood vessels) and have no effect on gastric acid secretion, which is mediated by H2 receptors on parietal cells. Blocking H1 receptors does nothing to reduce acid production, so they have no role in acid peptic disease.

2. Anticholinergics (Non-selective / Older muscarinic antagonists)

(e.g., atropine, propantheline)

Although non-selective anticholinergics can reduce gastric acid secretion by blocking M1/M3 receptors on parietal cells, they are not used in clinical practice for acid peptic disease because:

Their dose required to suppress acid also causes intolerable systemic side effects (dry mouth, urinary retention, blurred vision, tachycardia, constipation)
Far more effective and selective drugs (PPIs, H2 blockers) are available
They are considered obsolete for this indication

Note: The selective M1 antagonist pirenzepine was an exception and was briefly used, but even it has largely been replaced.

Summary Table

Drug Group	Why NOT used
H1 antihistamines	Block wrong receptor (H1, not H2); no effect on acid
Anticholinergics	Too many side effects at acid-suppressing doses; obsolete

The drugs that are used include: PPIs, H2 antihistamines (H2 blockers), antacids, prostaglandin analogues (misoprostol), sucralfate, and antibiotics (for H. pylori) - as outlined in Lippincott Illustrated Reviews: Pharmacology.

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