Eno
Eno is a powder (fruit salt) made by Haleon that contains Sodium bicarbonate + Citric acid. It combines Sodium bicarbonate: antacid and Citric acid: fizzing agent.
| Ingredient (salt) | Amount |
|---|---|
| Sodium bicarbonate | see pack |
| Citric acid | see pack |
Sodium bicarbonate
What it is used for
Quickly neutralises stomach acid.
How it works
Baking soda. It neutralises stomach acid quickly and is also used to make urine less acidic.
How to take it
Dissolve in water and take as directed for short-term relief; not for regular long-term use.
Common side effects
- Burping
- Bloating
- Wind
Get medical help straight away if
- Swelling of the legs or breathlessness (salt load)
- Muscle twitching or confusion
- Severe stomach pain after a big meal
Be careful
High in salt; avoid with high BP, heart or kidney disease.
Other medicines and interactions
High sodium: take care with heart failure, high blood pressure and kidney disease. Can change how other medicines are absorbed or excreted.
Pregnancy and breastfeeding
Avoid regular use in pregnancy because of the salt load; occasional use is generally fine.
Citric acid
What it is used for
Reacts with bicarbonate to make the drink fizz; helps it act fast.
How it works
Used with sodium bicarbonate to make effervescent (fizzy) tablets and powders; it also helps alkalise urine once absorbed as citrate.
How to take it
Dissolve fully in water before drinking.
Common side effects
Mild stomach upset
Get medical help straight away if
No specific warning signs at the amounts used
Be careful
Harmless in these amounts.
Other medicines and interactions
No important interactions at the amounts used.
Pregnancy and breastfeeding
No known concern.
Common questions
What is Eno?
Eno is a powder (fruit salt) by Haleon containing Sodium bicarbonate + Citric acid.
What is Eno used for?
Quickly neutralises stomach acid. Reacts with bicarbonate to make the drink fizz; helps it act fast.
How should I take Eno?
Dissolve in water and take as directed for short-term relief; not for regular long-term use. Dissolve fully in water before drinking. Always follow the dose your doctor or the pack gives.
What are the side effects of Eno?
Common side effects include: Burping, bloating, wind, Mild stomach upset. Get medical help straight away for: Swelling of the legs or breathlessness (salt load), muscle twitching or confusion, severe stomach pain after a big meal, No specific warning signs at the amounts used.
Does Eno need a prescription?
It is usually sold without a prescription in India, but ask a pharmacist if you take other medicines or have a long-term illness.
Can I take Eno in pregnancy or while breastfeeding?
Avoid regular use in pregnancy because of the salt load; occasional use is generally fine. No known concern.
What are the substitutes for Eno?
We have no other brand with exactly the same composition and strength in our list yet. Ask your pharmacist for an equivalent.
Sources and further reading
- Sodium bicarbonate: NHS · MedlinePlus
- Citric acid: NHS · MedlinePlus
NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.
Composition checked against pack details from large Indian online pharmacies. Last reviewed 31 October 2026. Written by Satya Babu.
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