article icon
article

Oral Rehydration Salts: How They Work and When to Use

Written by healthwords.ai's team of doctors and pharmacists based in UK | Updated: 17 Mar 2025 | 1 min read

Oral rehydration therapy (also known as oral rehydration salts or solution) is used to prevent and treat dehydration. Around the world, it is used to prevent serious illness and death from diarrhea. It has been reported to reduce the risk of death by more than 90%. It is considered so important that it is a part of the World Health Organization's list of essential medicines.

How does it work?

When you lose fluid through sweat or diarrhea, you lose more than just water. You are losing important salts such as sodium. If you were to drink simple water, your body would lose most of it and continue to lose the important salts simultaneously.

When taking O.R.S Hydration Tablets, the glucose helps get the sodium, which is also in the product, back into the body. This creates a path for water molecules to follow the sodium. It is a game of "follow the leader" back into the body’s cells; glucose first, sodium, and water.

This article has been written by UK-based doctors and pharmacists, so some advice may not apply to US users and some suggested treatments may not be available. For more information, please see our T&Cs.