Oral rehydration salts

This leaflet is for parents and carers about how to use this medicine in children. Our information may differ from that provided by the manufacturers, because their information usually relates to adults. Read this leaflet carefully. Keep it somewhere safe so that you can read it again.

Name of medicine

Oral rehydration salts

Brand names: Dioralyte, Dioralyte Relief, Electrolade

Why is it important for my child to take Oral rehydration salts?

Although diarrhoea in children usually gets better on its own, it causes loss of water and salts. This may lead to dehydration, which can be dangerous, especially in very young children, because it is difficult to see the signs of dehydration.

Your child may be dehydrated if they have any of the following:

  • fewer wet nappies, nappies that are lighter than usual, or an older child is urinating (weeing) less often
  • they are less active than normal
  • a dry mouth
  • crying without tears
  • a sunken soft spot on the top of a baby’s head.

Oral rehydration salts do not treat the diarrhoea itself, but they replace the salts and water that are lost, and so reduce the effects of dehydration.

If your child has the above symptoms and they are notbgetting better, contact your doctor or local NHS services (details at end of leaflet).

What is Oral rehydration salts available as?

  • Oral powder: one sachet is mixed with 200 mL tap water. All makes of oral rehydration salts contain some sugar.

When should I give Oral rehydration salts

Oral rehydration salts are usually given after each runny poo (diarrhoea). 

How much should I give?

Your doctor will work out the amount of oral rehydration salts (the dose) that is right for your child. If you have bought them from your pharmacy, the dose will be shown on the medicine label. Encourage your child to drink as much as they can of the recommended dose.

It is important that you follow your doctor’s instructions about how much to give.

How should I give Oral rehydration salts?

Oral powder

Open the sachet and pour the contents into 200 mL of tap water (this must be cooled boiled water for babies aged under 1 year). Stir well until all the powder has gone and the mixture is clear or just slightly cloudy. Make sure your child drinks the full dose needed. If they cannot drink it all in one go, they can drink it over about 30 minutes. It may help to use a straw.

Do not keep the solution for more than one hour at room temperature. If you keep it in a fridge you may keep it for 24 hours.

When should the medicine start working?

Oral rehydration salts should start working quickly and dehydration usually gets better within 3 to 4 hours. 

What if my child is sick (vomits)?

Often, sickness and diarrhoea come together, with a tummy bug (gastroenteritis). If your child is being sick as well as having diarrhoea, make up the full amount of oral rehydration salts but give small amounts often (10–20 mL every 5–10 minutes), as large drinks can make your child sick. It is important that you make sure the full amount is still given over a longer time.

  • If your child is sick less than 30 minutes after drinking the oral rehydration salts, give them again.
  • If your child is sick more than 30 minutes after drinking the oral rehydration salts, you do not need to give them again. You will not harm your child by giving too much of the oral rehydration salts, so if you are not sure how much your child has kept down, because they are being sick, it is better to give more rather than less of the oral rehydration salts.

Any oral rehydration salts that you have mixed with water but have not used should be thrown away after one hour (unless stored in a fridge, where they may be kept for 24 hours). 

What if I forget to give it?

Give your child the missed dose as soon as you remember.

What if I give too much?

You will not do harm if you give an extra dose of oral rehydration salts by mistake.

Are there any possible side effects?

We use medicines to make our children better, but sometimes they have other effects that we don’t want (side-effects). However, oral rehydration salts don’t often have any side effects.

There may sometimes be other side effects that are not listed above. If you notice anything unusual and are concerned, contact your doctor. You can report any suspected side effects to a UK safety scheme at

Can other medicines be given at the same time as Oral rehydration salts?

  • You can give your child medicines that contain paracetamol or ibuprofen, unless your doctor has told you not to.
  • Check with your doctor or pharmacist before giving any other medicines to your child. This includes herbal and complementary medicines.

You must tell your doctor if your child has ever had an allergic reaction or other reaction to any medicine they have been given before. If you have forgotten to tell your doctor, check with the doctor or pharmacist before giving Oral rehydration salts to your child.

Is there anything else I need to know about this medicine?

If your child is not able to keep down any fluids at all and is showing signs of becoming dehydrated (see above), contact your doctor straight away.

If your child’s diarrhoea is very bad and not getting better after 48 hours, and you are worried that your child is losing too much fluid, contact a doctor.

If your child has diabetes, you should be aware that this medicine contains sugar. Contact your doctor or diabetes nurse for advice.

  • If your child will not take the rehydration salts then try to give them water (cooled boiled water for babies aged under 1 year) or weak juice. Contact your doctor if they will not take any fluids.
  • In the first 24 hours, it is best for babies with diarrhoea not to have any feeds except breastfeeds. In older children, you should limit solid foods or milk for the first 24 hours, as this may make the diarrhoea get worse. If your child seems to be getting better, you can give them water or juice to drink as usual but continue to give the rehydration salts after every runny poo.
  • Normal feeding should be started again after 24 hours, as the diarrhoea gets better. Your child may have some mild diarrhoea for up to a month after having a tummy bug (gastroenteritis).
  • You should not use oral rehydration salts to treat diarrhoea for more than 2–3 days, unless your doctor has told you to.
  • You should only use water to mix with the oral rehydration salts; do not use milk or juice and never add extra sugar or salt. This is because the rehydration salts contain the right mix of water and salts to help the body best.
  • You must be careful to use the right amount of water to make up the medicine, as too much or too little can mean the salts in your child’s body are not properly balanced.
  • If your child has liver or kidney disease, you should not use oral rehydration salts unless your doctor has told you to. 

General advice about medicines

  • Only give this medicine to your child. Never give it to anyone else, even if their condition appears to be the same, as this could do harm.
  • If you think someone else may have taken the medicine by accident, contact your doctor for advice.
  • Make sure that the medicines you have at home have not reached the ‘best before’ or ‘use by’ date on the packaging. Give old medicines to your pharmacist to dispose of.
  • If you are not sure a medicine is working, contact your doctor but continue to give the medicine as usual in the meantime. Do not give extra doses, as you may do harm.

Where should I keep this medicine?

  • Keep the medicine in a cupboard, away from heat and direct sunlight.
  • Make sure that children cannot see or reach the medicine.
  • Keep the medicine in the container it came in.

Who to contact for more information?

Your doctor, pharmacist or nurse will be able to give you more information about Oral rehydration salts and about other medicines used to treat dehydration.

England: NHS 111

Tel 111

Scotland: NHS 24

Northern Ireland: NI Direct

Wales: NHS 111 Wales

Copyright disclaimer

Version [1]. © NPPG, RCPCH and WellChild, all rights reserved. Review by July 2016.

The primary source for the information in this leaflet is the British National Formulary for Children. For details on any other sources used for this leaflet, please contact us through our website,

We take great care to make sure that the information in this leaflet is correct and up-to-date. However, medicines can be used in different ways for different patients. It is important that you ask the advice of your doctor or pharmacist if you are not sure about something. This leaflet is about the use of these medicines in the UK, and may not apply to other countries. The Royal College of Paediatrics and Child Health (RCPCH), the Neonatal and Paediatric Pharmacists Group (NPPG), WellChild and the contributors and editors cannot be held responsible for the accuracy of information, omissions of information, or any actions that may be taken as a consequence of reading this leaflet.