Citric acid
Citric acid is a fizzing agent found in 1 medicine sold in India, such as Eno. Below: what it is for, how it works, how to take it, side effects, interactions and pregnancy advice.
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.
Combination medicines that contain Citric acid (1)
Common questions
What is Citric acid used for?
Reacts with bicarbonate to make the drink fizz; helps it act fast.
How does Citric acid work?
Used with sodium bicarbonate to make effervescent (fizzy) tablets and powders; it also helps alkalise urine once absorbed as citrate.
How should I take Citric acid?
Dissolve fully in water before drinking.
What are the side effects of Citric acid?
Common: Mild stomach upset. Get help straight away for: No specific warning signs at the amounts used.
Does Citric acid interact with other medicines?
No important interactions at the amounts used.
Is Citric acid safe in pregnancy and breastfeeding?
No known concern.
Does Citric acid need a prescription in India?
It is usually sold without a prescription in India, but ask a pharmacist if you take other medicines or have a long-term illness.
Which brands contain Citric acid?
Eno.
Sources and further reading
- 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.
Last reviewed 31 October 2026. Written by Satya Babu from standard prescribing information.
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