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Pairs nicely with
Same aisle. Different jobs.
Electrolyte sachets vs rehydration sachets.
They sit side by side on the shelf, but one is built for a tummy bug and the other for a Tuesday. Here’s why the sugar matters, and which suits your day.
Reviewed 12 November 2026 by the Spruce team. General information, not medical advice.
The short answer.
Rehydration sachets (oral rehydration salts) are made to replace the fluid and salts you lose through diarrhoea and vomiting. They need glucose as well as salt, in a set balance, because your gut absorbs sodium and glucose together and water follows. Everyday electrolyte sachets are for daily drinking: lower in sodium, often sugar free, and made to taste good. Different jobs, so they’re built differently.
One tap.
Which do
I need?
Pick the day you’re having.
If you have signs of dehydration that aren’t improving, or you’re worried about a baby, child or older person, follow the NHS dehydration advice ↗ and speak to a pharmacist or GP.
The clever bit.
Why rehydration
sachets need sugar.
- Sodium and glucose travel togetherIn your small intestine, they’re absorbed as a pair. Water follows them in.
- So the balance mattersToo little glucose and the salt isn’t absorbed as well. Too much and it can pull water the wrong way. That’s why rehydration salts are made to a set recipe.
- The recipeThe World Health Organization’s rehydration salts contain 13.5g of glucose and about 1,725mg of sodium per litre. A typical UK pharmacy sachet has about 3.6g of glucose and 300mg of sodium in a 200ml glass.
- Without it, it isn’t rehydration saltsA sugar-free electrolyte drink can still be a good everyday drink. It just isn’t built to treat dehydration from illness.
Side by side.
Three drinks,
three jobs.
What’s in each, and when it earns its place.
Show the table
| Compare | Rehydration salts | Sports drinks | Spruce Daily Electrolytes |
|---|---|---|---|
| Made for | Replacing fluid and salts lost through diarrhoea and vomiting | Fuel and fluid for long, hard exercise | Everyday drinking, with flavour |
| Sugar | Glucose, in a set amount (about 3.6g per 200ml glass) | Usually carbohydrate for energy | 0g, sweetened with stevia |
| Sodium | About 300mg per 200ml glass | Varies by brand and strength | 120mg per sachet |
| Where you get it | Pharmacies, as a medicine | Supermarkets and sports shops | Online and in supermarkets |
| Every day? | No, short-term when you’re unwell | For training days, not desk days | Made for it |
Spruce Daily Electrolytes are a food product, not a rehydration treatment. Figures for rehydration salts from the WHO formula and a UK pharmacy sachet’s official product information.
For the everyday bit.
Daily
Electrolytes.
Rehydration salts are for when you’re ill. For everything else, water first, and a low-sodium, sugar-free sachet when you want minerals and a flavour you’ll actually finish.
Less guessing.
Quick
questions.
The things people ask in the pharmacy aisle.
What’s the difference between electrolyte sachets and rehydration sachets?
Rehydration sachets (oral rehydration salts) are made to replace the fluid and salts lost through diarrhoea and vomiting. They contain glucose and a set amount of sodium, because the two are absorbed together in the gut and water follows. Everyday electrolyte sachets are drinks for daily hydration and taste, usually lower in sodium, and many have no sugar.
Why do rehydration sachets contain sugar?
In the small intestine, sodium and glucose are absorbed together and water follows them. The World Health Organization’s rehydration salts contain 13.5g of glucose and about 1,725mg of sodium per litre for that reason. A typical UK pharmacy sachet has about 3.6g of glucose and 300mg of sodium in a 200ml glass.
Can you take rehydration sachets every day?
They’re designed for short-term use when you’re losing fluid through illness, as directed on the pack or by a pharmacist. For everyday drinking, water or a low-sodium everyday drink is a better fit.
Are sports drinks the same as rehydration sachets?
No. Sports drinks are made to fuel long, hard exercise, so they usually carry more carbohydrate for energy. Rehydration salts are a medicine with a set balance of glucose and salts for when you’re unwell.
Is Spruce a rehydration sachet?
No. Spruce Daily Electrolytes are a food product for everyday drinking, with 120mg of sodium and no sugar per sachet. If you’re dehydrated from diarrhoea or vomiting, ask a pharmacist about oral rehydration salts.
When should I get help for dehydration?
Follow the NHS dehydration advice ↗. A pharmacist can help, and the NHS page lists the signs that mean you should contact a GP or NHS 111.