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Antacids – Uses, Mechanism and Side Effects

Antacids are medications that neutralize excess stomach acid, providing fast relief from heartburn and acid-related digestive complaints.

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Things worth knowing about "Antacids"

Antacids are medications that neutralize excess stomach acid, providing fast relief from heartburn and acid-related digestive complaints.

What Are Antacids?

Antacids are a class of over-the-counter medications used to neutralize excess stomach acid. They are among the most widely used remedies for heartburn, acid reflux, and general stomach discomfort. Antacids typically work within minutes of ingestion, making them a popular choice for rapid symptom relief.

Mechanism of Action

The stomach lining is normally protected from hydrochloric acid (HCl) by a mucous barrier. When this barrier is disrupted or when too much acid is produced, symptoms such as heartburn and stomach pain can occur. Antacids contain alkaline (basic) compounds that chemically neutralize stomach acid by raising the pH in the stomach, thereby reducing irritation of the gastric mucosa.

Common active ingredients found in antacids include:

Sodium bicarbonate: works quickly but has a short duration of action
Calcium carbonate: effective neutralizer; may slightly increase gastrin secretion, leading to a rebound effect
Magnesium hydroxide: neutralizing effect with a mild laxative action
Aluminum hydroxide: neutralizing and mucosal-protective; may cause constipation
Combination products: magnesium and aluminum hydroxide are often combined to balance side effects such as diarrhea and constipation

Indications

Antacids are used for the following conditions:

Heartburn: a burning sensation in the chest, often after meals or when lying down
Acid reflux: backflow of stomach acid into the esophagus
Gastritis: inflammation of the stomach lining
Functional dyspepsia: upper abdominal discomfort without an identifiable organic cause
Heartburn during pregnancy: certain antacids are considered safe for use during pregnancy

Dosage and Administration

Antacids are generally taken after meals and before bedtime, as stomach acid production tends to peak at these times. They are available in various forms, including chewable tablets, liquid suspensions, and lozenges. The appropriate dose depends on the specific product and should follow the manufacturer instructions or medical advice.

Important: Antacids should not be taken at the same time as other medications, as they can interfere with the absorption of other drugs in the intestine. A gap of at least 1 to 2 hours between antacids and other medications is recommended.

Side Effects

Antacids are generally well tolerated when used short-term. Possible side effects include:

Aluminum-containing antacids: constipation; potential aluminum accumulation with long-term use
Magnesium-containing antacids: loose stools or diarrhea
Calcium carbonate: acid rebound effect; hypercalcemia (elevated blood calcium) with excessive use
Sodium bicarbonate: belching due to released CO₂; increased sodium intake with frequent use (relevant for patients with high blood pressure)

When to See a Doctor

Antacids are suitable for short-term self-medication. However, medical advice should be sought if:

Symptoms persist for more than 2 weeks despite antacid use
Difficulty or pain when swallowing occurs
Unintentional weight loss is observed
Blood in the stool or black, tarry stools are noticed
Frequent vomiting occurs

These symptoms may indicate more serious conditions such as a peptic ulcer, reflux esophagitis, or in rare cases a tumor, and require thorough medical evaluation.

Antacids vs. Other Acid-Reducing Medications

Unlike antacids, which neutralize existing stomach acid, other drug classes actively reduce acid production:

H₂ blockers (e.g., ranitidine, famotidine): block histamine receptors in the stomach wall, reducing acid secretion
Proton pump inhibitors (PPIs) (e.g., omeprazole, pantoprazole): block the proton pump and are the most potent acid-suppressing agents available

Antacids act faster but have a shorter duration of action compared to H₂ blockers and PPIs. They are therefore best suited for the quick relief of occasional symptoms.

References

Brunton, L. L. et al.: Goodman & Gilman's The Pharmacological Basis of Therapeutics. 13th Edition. McGraw-Hill Education, New York, 2017.
World Health Organization (WHO): Model Formulary – Antacids and Other Antiulcer Drugs. WHO, Geneva. Available at: https://www.who.int
Koop, H. et al.: S2k Guideline – Gastroesophageal Reflux Disease. German Society of Gastroenterology, Digestive and Metabolic Diseases (DGVS), 2023.

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