Antacid

Substance that relieves stomach problems

This article is about the medication used to relieve heartburn. For the acid produced by ants, known in many languages as "ant acid", see Formic acid.

Not to be confused with acid suppression therapy with PPIs or H2RAs, which reduces acid production.

Calcium carbonate antacid tablets

An antacid is a substance which neutralizes stomach acidity and is used to relieve heartburn, indigestion, or an upset stomach.[1] Some antacids have been used in the treatment of constipation and diarrhea.[2] Marketed antacids contain salts of aluminum, calcium, magnesium, or sodium.[2] Some preparations contain a combination of two salts, such as magnesium carbonate and aluminum hydroxide (e.g., hydrotalcite).[3]

## Medical uses

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Antacids are available over the counter and are taken by mouth to quickly relieve occasional heartburn, the major symptom of gastroesophageal reflux disease and indigestion. Treatment with antacids alone is symptomatic and only justified for minor symptoms.[4] Alternative uses for antacids include constipation, diarrhea, hyperphosphatemia, and urinary alkalization.[2] Some antacids are also used as an adjunct to pancreatic enzyme replacement therapy in the treatment of pancreatic insufficiency.[5]

Non-particulate antacids (sodium citrate) increase gastric pH with little or no effect on gastric volume, and therefore may see some limited use in pre-operative procedures. Sodium citrate should be given within one hour of surgery to be the most effective.[6]

## Side effects

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Conventional effervescent tablets contain a significant amount of sodium and are associated with increased odds of adverse cardiovascular events according to a 2013 study.[7] Alternative sodium-free formulations containing magnesium salts may cause diarrhea, whereas those containing calcium or aluminum may cause constipation.[8]: Table 2 Long-term use of antacids containing aluminum may increase the risk of developing osteoporosis.[9] In vitro studies have found a potential for acid rebound to occur due to antacid overuse, however the significance of this finding has been called into question.[10][11]

## Properties of antacids

[edit]

When an excess amount of acid is produced in the stomach, the natural mucous barrier that protects the lining of the stomach can degrade, leading to pain and irritation.[12] There is also potential for the development of acid reflux, which can cause pain and damage to the esophagus.[citation needed] Antacids contain alkaline ions that chemically neutralize stomach gastric acid, reducing damage to the stomach lining and esophagus, and relieving pain.[1] Some antacids also inhibit pepsin, an enzyme that can damage the esophagus in acid reflux.[2][13]

Antacids do not directly inhibit acid secretion, and thus are distinct from acid-reducing drugs like H2-receptor antagonists or proton pump inhibitors.[4] Antacids do not kill the bacterium, Helicobacter pylori, which causes most ulcers.[4]

## Types

[edit]

Antacids are mainly classified into two categories:

* Systemic (absorbable) antacids: They are water soluble and systemically absorbed and pass into the bloodstream. e.g. sodium bicarbonate or sodium citrate
* Non-systemic (non-absorbable) antacids: They are insoluble and not absorbed into systemic circulation. They only act in the stomach e.g. magnesium carbonate or calcium carbonate[14]

## Interactions

[edit]

Structural depiction of tetracycline metal chelation, where 'M' is a metal such as those found in antacids

Antacids are known to interact with several oral medications, including fluoroquinolone and tetracycline antibiotics, iron, itraconazole, and prednisone.[15] Metal chelation is responsible for some of these interactions (e.g. fluoroquinolones, tetracyclines), leading to decreased absorption of the chelated drug. Some interactions may be due to the pH increase observed in the stomach following antacid ingestion, leading to increased absorption of weak acids, and decreased absorption of weak bases.[citation needed] Antacids also cause an increase in pH of the urine (alkalization), which may cause increased blood concentrations of weak bases, and increased excretion of weak acids.[16]

A proposed method to mitigate the effects of stomach acidity and chelation on drug absorption is to space out the administration of antacids with interacting medications by at least two hours,[17] however this method has not been well studied for drugs affected by urine alkalization.[15]

There are concerns regarding interactions between delayed-release tablets and antacids, as antacids may increase the stomach pH to a point at which the coating of the delayed-release tablet will dissolve, leading to degradation of the drug if it is pH sensitive.[16]

## Formulations

[edit]

Antacids may be formulated with other active ingredients such as simethicone to control gas, or alginic acid to act as a physical barrier to acid.[18]

### Liquids

[edit]

Several liquid antacid preparations are marketed. Common liquid preparations include milk of magnesia and magnesium/aluminum combinations. A potential advantage of using a liquid preparation over a tablet is that liquids may provide quicker relief, however this may coincide with a shorter duration of action.[19]

### Tablets

[edit]

#### Chewable tablets

[edit]

Chewable tablets are one of the most common forms of antacids, most frequently made from carbonate or hydroxide salts, and are readily available over the counter. Upon reaching the stomach, the powdered antacid salts bind to hydronium (H+) ions, producing chloride salts, carbon dioxide, and water. This process reduces the concentration of H+ ions in the stomach, raising the pH and neutralizing the acid.[8]: Figure 1 Common carbonate salts available in tablet form include those of calcium, magnesium, aluminum, and sodium.[15]

Some common American brands are Tums, Gaviscon chewable tablets, and Maalox chewable tablets.[20]

#### Effervescent tablets

[edit]

Effervescent tablets are tablets which are designed to dissolve in water, and then release carbon dioxide.[21][22][23] Common ingredients include citric acid and sodium bicarbonate, which react when in contact with water to produce carbon dioxide. Effervescent antacids may also contain aspirin,[24] sodium carbonate, or tartaric acid.[25] Those containing aspirin may cause further gastric irritation and ulceration due to aspirin's effects on the mucous membrane of the stomach.[26]

## Brand names

[edit]

Some brands include Alka-Seltzer, Gaviscon, Tums, Gelusil and Eno.[27][28][29]

## References

[edit]

1. ^ a b Internal Clinical Guidelines Team. (UK) (2014). Dyspepsia and Gastro-Oesophageal Reflux Disease: Investigation and Management of Dyspepsia, Symptoms Suggestive of Gastro-Oesophageal Reflux Disease, or Both. National Institute for Health and Care Excellence: Clinical Guidelines. London: National Institute for Health and Care Excellence (UK). PMID 25340236.
2. ^ a b c d Salisbury BH, Terrell JM (2020). "Antacids". StatPearls. Treasure Island (FL): StatPearls Publishing. PMID 30252305. Archived from the original on 5 November 2021. Retrieved 24 November 2020.
3. ^ "Aluminum hydroxide and magnesium carbonate Uses, Side Effects & Warnings". Drugs.com. Archived from the original on 20 May 2021. Retrieved 24 November 2020.
4. ^ a b c "Consumer Summary – Treatment Options for GERD or Acid Reflux Disease: A Review of the Research for Adults". U.S. Department of Health & Human Services. Agency for Healthcare Research and Quality. 23 September 2011. Archived from the original on 11 October 2014.
5. ^ Graham DY (June 1982). "Pancreatic enzyme replacement: the effect of antacids or cimetidine". Digestive Diseases and Sciences. 27 (6): 485–490\. doi:10.1007/BF01296725. PMID 6282548. S2CID 10640940.
6. ^ Apfelbaum JL, Agarkar M, Connis RT, Coté CJ, Nickinovich DJ, Warner MA, et al. (American Society of Anesthesiologists Committee on Standards and Practice Parameters) (March 2017). "Practice Guidelines for Preoperative Fasting and the Use of Pharmacologic Agents to Reduce the Risk of Pulmonary Aspiration: Application to Healthy Patients Undergoing Elective Procedures: An Updated Report by the American Society of Anesthesiologists Task Force on Preoperative Fasting and the Use of Pharmacologic Agents to Reduce the Risk of Pulmonary Aspiration". Anesthesiology. 126 (3): 376–393\. doi:10.1097/ALN.0000000000001452. PMID 28045707.
7. ^ George J, Majeed W, Mackenzie IS, Macdonald TM, Wei L (November 2013). "Association between cardiovascular events and sodium-containing effervescent, dispersible, and soluble drugs: nested case-control study". BMJ. 347: f6954. doi:10.1136/bmj.f6954. PMC 3898660. PMID 24284017.
8. ^ a b Garg V, Narang P, Taneja R (March 2022). "Antacids revisited: review on contemporary facts and relevance for self-management". The Journal of International Medical Research. 50 (3): 3000605221086457. doi:10.1177/03000605221086457. PMC 8966100. PMID 35343261.
9. ^ "Taking Antacids". Medline Plus. U.S. Department of Health and Human Services, National Institutes of Health, U.S. National Library of Medicine. 7 November 2014. Archived from the original on 5 July 2016.
10. ^ Texter EC (February 1989). "A critical look at the clinical use of antacids in acid-peptic disease and gastric acid rebound". The American Journal of Gastroenterology. 84 (2): 97–108\. PMID 2644821.
11. ^ Hade JE, Spiro HM (July 1992). "Calcium and acid rebound: a reappraisal". Journal of Clinical Gastroenterology. 15 (1): 37–44\. doi:10.1097/00004836-199207000-00010. PMID 1500660. S2CID 10897187.
12. ^ McColl KE (October 2011). "The elegance of the gastric mucosal barrier: designed by nature for nature". Gut. 61 (6): 787–788\. doi:10.1136/gutjnl-2011-301612. PMID 22147513.
13. ^ Bardhan KD, Strugala V, Dettmar PW (2012). "Reflux revisited: advancing the role of pepsin". International Journal of Otolaryngology. 2012: 646901. doi:10.1155/2012/646901. PMC 3216344. PMID 22242022.
14. ^ MrlabTest - Antacids. URL: https://www.mrlabtest.com/medication/antacids.htm. Accessed on: November 27, 2024.
15. ^ a b c Ogawa R, Echizen H (October 2011). "Clinically significant drug interactions with antacids: an update". Drugs. 71 (14): 1839–1864\. doi:10.2165/11593990-000000000-00000. PMID 21942976. S2CID 36875514.
16. ^ a b Patel D, Bertz R, Ren S, Boulton DW, Någård M (April 2020). "A Systematic Review of Gastric Acid-Reducing Agent-Mediated Drug-Drug Interactions with Orally Administered Medications". Clinical Pharmacokinetics. 59 (4): 447–462\. doi:10.1007/s40262-019-00844-3. PMC 7109143. PMID 31788764.
17. ^ Australian Medicines Handbook Pty Ltd (2022). Australian Medicines Handbook 2022. Adelaide, SA. ISBN 978-0-6485158-6-9.`{{cite book}}`: CS1 maint: location missing publisher (link)
18. ^ Thompson WG (12 September 2014). "Antacids". IFFGD Publication #520. International Foundation for Functional Gastrointestinal Disorders, Inc. (IFFGD). Archived from the original on 6 May 2016.
19. ^ Barnett CC, Richardson CT (November 1985). "In vivo and in vitro evaluation of magnesium-aluminum hydroxide antacid tablets and liquid". Digestive Diseases and Sciences. 30 (11): 1049–1052\. doi:10.1007/BF01315602. PMID 4053915. S2CID 8133980.
20. ^ "Maalox Antacid Oral: Uses, Side Effects, Interactions, Pictures, Warnings & Dosing". WebMD. Archived from the original on 24 June 2022. Retrieved 24 June 2022.
21. ^ Dubogrey I (2013). "Putting the Fizz into Formulation". European Pharmaceutical Contractor. No. Autumn. Archived from the original on 28 August 2021. Retrieved 17 April 2017.
22. ^ "Tablets". British Pharmacopeia. 2003. Archived from the original on 3 January 2013.
23. ^ International Pharmacopoeia 2006. World Health Organization. 2006. pp. 966. ISBN 978-92-4-156301-7. Retrieved 1 July 2013.
24. ^ "Alka Seltzer Directions of use, Sodium & Aspirin content – Alka Seltzer relief from Headaches, Migraine & Upset stomach". alkaseltzer.ie. Archived from the original on 29 April 2015. Retrieved 17 April 2017.
25. ^ Blair GT, DeFraties JJ (2000). "Hydroxy Dicarboxylic Acids". Kirk-Othmer Encyclopedia of Chemical Technology. Kirk Othmer Encyclopedia of Chemical Technology. pp. 1–19\. doi:10.1002/0471238961.0825041802120109.a01. ISBN 978-0471238966.
26. ^ Graham DY, Smith JL (March 1986). "Aspirin and the stomach". Annals of Internal Medicine. 104 (3): 390–398\. doi:10.7326/0003-4819-104-3-390. PMID 3511824.
27. ^ "Which OTC Meds Treat Heartburn?". WebMD. 30 March 2023. Retrieved 8 January 2024.
28. ^ "Eno – Summary of Product Characteristics at eMC". Electronic Medicines Compendium. Retrieved 2 September 2016. "Last updated 1 January 2016"
29. ^ "Gelusil - Uses, Side Effects, and More". Retrieved 27 February 2024.

## External links

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* The dictionary definition of antacid at Wiktionary

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