Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Sodium carbonate (Na₂CO₃), also known as washing soda or soda ash, is an alkaline compound that has been used as an antacid, though less commonly than sodium bicarbonate. The therapeutic rationale is based on its ability to neutralize excess gastric acid in the stomach, thereby relieving symptoms of acid indigestion or heartburn. The neutralization reaction produces salt, water, and carbon dioxide gas, which can temporarily alleviate discomfort caused by high stomach acidity.

Historically, sodium carbonate was included in some older antacid formulations, but due to its relatively high alkalinity and potential side effects, it has largely been replaced by milder agents such as sodium bicarbonate (baking soda), calcium carbonate, and magnesium or aluminum hydroxides. Modern pharmacological references (such as Goodman & Gilman’s Pharmacological Basis of Therapeutics) note that sodium carbonate's strong alkalinity can lead to rapid neutralization of stomach acid, but also carries a higher risk of causing alkalosis (elevated blood pH) and can cause gastrointestinal irritation or “rebound” acid secretion.

Nevertheless, the underlying mechanism of acid neutralization is well-established and scientifically validated. The evidence supporting its effectiveness in neutralizing gastric acid is robust, but due to safety concerns and the availability of safer alternatives, sodium carbonate is not commonly recommended today for routine management of acid indigestion.

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