ORS in Pakistan: When & How to Use Oral Rehydration Salts (2026)

Few remedies are as cheap, simple and genuinely life-saving as oral rehydration salts. The main ORS uses are treating and preventing dehydration, whether from a stomach bug, a bout of vomiting, a fever, or the brutal Pakistani summer when garmi and loo winds drain the body of fluid and salts within hours. Knowing how to use oral rehydration salts correctly, and just as importantly when ORS alone is not enough, is something every household in Pakistan should understand. This guide walks you through all of it, for both adults and children.

What ORS is and how it works

ORS, or oral rehydration salts, is a precisely balanced mix of glucose (sugar) and electrolytes, mainly sodium and potassium, dissolved in clean water. When you are dehydrated, you have lost not just water but also these essential salts, and plain water alone cannot replace them efficiently.

The clever part is the science. Your gut has a built-in pump called glucose-sodium co-transport. Sodium and glucose are absorbed together across the intestinal wall, and water follows them into the bloodstream. By pairing the right amount of sugar with the right amount of salt, ORS hijacks this pump and pulls fluid into the body far faster than water on its own, even when the gut is irritated by diarrhoea. This simple idea is one of the most important medical advances of the last century, and it works in your kitchen as well as in a hospital.

When to use ORS

ORS is useful any time the body is losing fluid and salts faster than usual. Common situations in Pakistan include:

• Diarrhoea. The classic and most important use. ORS in diarrhoea replaces the fluid and salts lost in loose stools and prevents dangerous dehydration.
• Vomiting. Sipped slowly in small amounts, ORS helps replace what is lost even when keeping food down is hard.
• Heat exhaustion and the summer loo. During heatwaves, heavy sweating strips the body of water and salts. ORS for dehydration is invaluable for outdoor workers, commuters and anyone caught in the garmi.
• Heavy sweating and physical work. Labourers, athletes and people exercising in the heat lose a lot through sweat and benefit from electrolytes, not just water.
• Fever. A high temperature increases fluid loss, so ORS helps keep both children and adults hydrated.
• After exercise. A mild way to top up electrolytes and rehydrate after a hard session in hot weather.

A convenient option is S-Lyte ORS Hydration Sachets (Rs 299), which come in lemon and orange flavours that make them far easier to sip, especially for children who refuse plain salty water.

How to prepare and dose ORS correctly

The single most important rule is to follow the packet instructions exactly. ORS only works at the right concentration.

• Use clean water. Dissolve the sachet in the exact volume of clean, safe drinking water stated on the packet, usually 200ml per sachet or one litre, depending on the product. Boiled and cooled or bottled water is safest.
• Do not over-concentrate. Never add extra powder or use less water to "make it stronger". A too-strong solution draws water out of the body and can worsen dehydration. Likewise, do not water it down too much.
• Do not add sugar, salt or juice. The balance is already correct. Adding more changes the chemistry.
• Mix fresh and use within 24 hours. Discard any solution left after a day and make a fresh batch. Keep it covered and cool.
• Sip slowly and steadily. Small, frequent sips are absorbed better than large gulps, and are less likely to trigger more vomiting.

ORS for children and adults

ORS is safe and recommended for all ages, but the approach differs a little.

For children

Children dehydrate faster than adults, so ORS is especially important. Offer small amounts often, for example a few teaspoons or sips every few minutes after each loose stool or vomit, rather than forcing a large drink. Continue normal feeding and breastfeeding alongside. The pleasant lemon and orange flavours of a flavoured ORS make it much easier to get a reluctant child to drink. If you also want to keep your child topped up on everyday nutrients during recovery, see our guide to the best multivitamin for kids in Pakistan.

For adults

Adults should drink ORS after each episode of diarrhoea or vomiting and keep sipping through the day to stay ahead of losses. In heat, do not wait until you feel parched, thirst lags behind real fluid loss. Keep drinking even if you feel fine.

Signs of dehydration to watch for

Recognising dehydration early lets you act before it becomes serious. Common signs include:

• Thirst and a dry mouth, lips or tongue.
• Dark yellow urine, or passing much less urine than usual.
• Tiredness, dizziness or light-headedness.
• Headache and difficulty concentrating.
• In babies and young children, fewer wet nappies, no tears when crying, a sunken soft spot on the head, and unusual sleepiness or irritability.

The NHS guide to dehydration has a clear checklist that is useful to keep in mind.

When ORS is NOT enough: see a doctor

ORS treats and prevents most mild to moderate dehydration, but it has limits. Get medical help or go to hospital if you see any of these:

• Severe dehydration, for example sunken eyes, very little or no urine, rapid breathing, a fast weak pulse, or extreme weakness.
• Persistent vomiting that makes it impossible to keep even small sips of ORS down.
• Blood in the stool or in vomit.
• Drowsiness, confusion or unresponsiveness.
• High fever, severe abdominal pain, or diarrhoea lasting more than a few days.
• Dehydration in a very young baby, an elderly person, a pregnant woman, or anyone with a chronic illness.

In these cases the person may need intravenous (IV) fluids and treatment that only a doctor or hospital can provide. The WHO fact sheet on diarrhoeal disease and rehydration stresses that ORS is the first-line treatment, but severe cases need urgent professional care. When in doubt, do not delay.

Preventing dehydration in the Pakistani summer

Prevention beats treatment, especially during the long, fierce Pakistani summer. A few habits go a long way:

• Drink water regularly through the day, not just when thirsty.
• Keep ORS sachets at home and in your bag during heatwaves, road trips and at work sites.
• Avoid the midday sun where possible and take breaks in the shade.
• Eat water-rich foods such as cucumber, watermelon and citrus.
• Watch the very young and very old closely, as they dehydrate fastest.

If summer heat is also leaving you flat and exhausted, our piece on always feeling tired and the causes of fatigue in Pakistan covers other reasons for low energy. For seasonal sniffles that often arrive with the changing weather, see our guide to spring allergies in Pakistan and natural relief. And if a sensitive stomach is part of your picture, our article on how to reduce bloating and improve gut health may help.

This article was written and medically reviewed to our medical review board standards and is for general guidance, not personal medical advice. Always speak to a doctor or pharmacist about your own situation.