ORS Full Form
Oral Rehydration Solution
What does ORS stand for? A medical term, explained.
ORS Full Form in English, letter by letter
ORS stands for Oral Rehydration Solution (the packets are also called Oral Rehydration Salts), a salt and glucose drink that treats dehydration.
ORS Full Form in Indian Languages
Diarrhoea still sends many Indian children to clinics, and one of the cheapest treatments sits on every chemist's shelf. Here is ORS, Oral Rehydration Solution, in six Indian languages.
What ORS is and why it works
ORS is a measured mixture of clean water, salts and glucose. In diarrhoea the body loses sodium, potassium and chloride as well as water, and plain water replaces none of these. The packets are labelled Oral Rehydration Salts, and the drink made from them is the Oral Rehydration Solution.
It works because of a transport protein in the small intestine, called SGLT1, which pulls glucose and sodium in together, with water following by osmosis. That pathway keeps working even in severe diarrhoea, which is why the WHO and UNICEF recommend ORS as the first treatment. The method was developed in the 1960s and 1970s, and Indian physician Dilip Mahalanabis used it among refugees in 1971.
In India, ORS packets are available at pharmacies, and government health centres and anganwadis supply them free. ASHA workers distribute them in households, especially in the monsoon, when diarrhoeal disease rises.
What is in an ORS packet and how to mix it
One packet is dissolved in one litre of clean drinking water. The WHO low-osmolarity formula per litre has 2.6 g sodium chloride, 1.5 g potassium chloride, 2.9 g trisodium citrate and 13.5 g anhydrous glucose, giving 245 mOsm/L. The WHO and UNICEF changed to this lower-osmolarity formula in 2002 from the older 311 mOsm/L one, because it worked better and reduced the need for intravenous fluids.
Mix it carefully. Extra sugar makes the drink too concentrated, and extra salt is dangerous. Use plain cooled water, not milk, juice or a soft drink, and discard any left over after 24 hours. Read the packet for the volume of water needed, since some packet sizes make less than a litre.
How much ORS to give
Give small, frequent sips after each loose stool. The WHO guide is 50 to 100 ml for a child under two years, 100 to 200 ml for a child of two to ten years, and as much as wanted for older children and adults. A spoon or small cup works better than a bottle for a young child.
If the child vomits, wait ten minutes and then start again more slowly, with a teaspoon every minute or two. Most of the fluid is still absorbed.
Zinc is the other half of the treatment for children. The usual dose is 20 mg daily for 10 to 14 days (10 mg daily for infants under six months). It shortens the episode and lowers the chance of another one in the next two or three months. Continue breastfeeding and normal feeding, because starving a child with diarrhoea slows recovery.
ORS compared with water, coconut water and sports drinks
Plain water replaces fluid but not salts. After a lot of vomiting or loose stools, the body needs salt and sugar with the water.
Coconut water is rich in potassium and low in sodium and glucose, so its balance is not suited to diarrhoea losses. It is fine for mild heat-related thirst but not a substitute for ORS in a sick child.
Commercial sports drinks and colas have much more sugar than ORS and far less sodium, and they can make diarrhoea worse. In October 2025 the Food Safety and Standards Authority of India (FSSAI) ordered that the term 'ORS' must not be used on drinks that do not meet the WHO formula, and the matter has since been tied up in court challenges, so check the packet for the WHO composition.
Myths and when to see a doctor
A common belief is that ORS makes the motions more frequent. It does not stop the stools, but it replaces the lost fluid and the child usually recovers faster. Another is that ORS is only for children. Adults with food poisoning, cholera or heat illness use it too.
Go to a doctor or clinic if there is blood in the stool, repeated vomiting that stops the child keeping fluids down, no urine for six hours or more, sunken eyes, drowsiness, a high fever, or if diarrhoea lasts more than two days. A baby under six months with diarrhoea should be seen early. Safe water, handwashing and vaccination work alongside ORS, not in place of it.
One more point matters for caregivers. Dehydration shows in stages. Early signs are thirst, a dry mouth and fewer wet nappies or less urine. Moderate dehydration brings sunken eyes, irritability and loose skin that goes back slowly when pinched. Severe dehydration brings drowsiness, a weak pulse and cold hands and feet, and it needs hospital treatment with intravenous fluids. ORS can treat early and moderate dehydration at home, which is why starting it at the first loose stool is advised.
Keep a few packets at home before the monsoon begins. The amount you give after each loose stool matters more than the full form, and it is the amount that prevents dehydration.
ORS Full Form: Common Questions
What is the full form of ORS?
Oral Rehydration Solution. The packets are often labelled Oral Rehydration Salts. It is a mix of water, glucose and salts that prevents and treats dehydration from diarrhoea or vomiting.
How do you make ORS at home in an emergency?
Dissolve six level teaspoons of sugar and half a level teaspoon of salt in one litre of clean water. Use it only until a proper ORS packet is available, and measure carefully.
Can ORS be given to a baby?
Yes. Give small sips with a clean spoon after each loose stool, and keep breastfeeding. A baby under six months with diarrhoea should see a doctor.
Why is ORS better than plain water or coconut water?
ORS supplies sodium, potassium and glucose in proportions that the intestine absorbs best. Plain water has no salts, and coconut water is low in sodium.
When should a child see a doctor instead of just getting ORS?
If there is blood in the stool, repeated vomiting, no urine, sunken eyes, drowsiness or a high fever, or if the diarrhoea has lasted more than two days.
How long can a prepared ORS solution be kept?
Use it within 24 hours of mixing, kept covered in a clean container, and discard what is left. Prepare a fresh packet each day.