To rehydrate after norovirus, replace lost fluid steadily, including salts lost through vomiting or diarrhea. Take small, frequent sips instead of drinking a lot at once. A pharmacy oral rehydration solution (ORS) is a good choice when fluid loss continues; mix it exactly as directed on the packet. Water and broth can also help. Seek urgent care if you cannot keep fluids down or notice signs of dehydration.
Why is rehydration important after norovirus?
Norovirus can cause repeated vomiting and watery diarrhea, both of which remove water and electrolytes from the body. Electrolytes are minerals, including sodium and potassium, that help the body maintain fluid balance and carry out important functions. If you lose more fluid than you take in, dehydration can develop.
The Centers for Disease Control and Prevention (CDC) recommends drinking plenty of liquids to replace losses from vomiting and diarrhea. Many people recover from norovirus within a few days, but replacing fluids remains important while symptoms continue. Drinking regularly, even when you do not feel particularly thirsty, can help you keep up with ongoing fluid losses.
What is the best drink for rehydration after norovirus?
Oral rehydration solution (ORS)
Oral rehydration solution is often the best choice when vomiting or diarrhea is frequent, particularly when dehydration is a concern. It contains water, glucose and electrolytes in a carefully balanced mixture to replace what the body loses. You can usually obtain ORS sachets from a pharmacy. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) recommends oral rehydration solutions for children with viral gastroenteritis and for older adults or adults with a weakened immune system or significant fluid loss.
Prepare a sachet using exactly the amount of clean water stated on its packaging. Do not add extra salt or sugar, and do not mix the solution with juice, milk or other drinks unless the product instructions specifically allow it. Making the solution too concentrated or too diluted changes its intended balance. Prepare fresh solution as directed by the manufacturer and follow any storage and disposal instructions.
Water, broth and other drinks
If symptoms are relatively limited and you can drink comfortably, water, broth and soup can help replace fluids. However, when vomiting or diarrhea is ongoing, ORS provides a more targeted way to replace lost electrolytes. Sports drinks may help with mild fluid loss in adults, but they are not the same as a properly formulated oral rehydration solution.
Avoid relying on sugary soft drinks or large amounts of fruit juice while diarrhea continues, as these drinks can make loose stools worse in some people. Alcohol is best avoided during recovery, and caffeinated drinks are not ideal as your main source of fluids. The UK National Health Service (NHS) recommends small sips of fluid when nausea makes drinking difficult and advises avoiding fruit juice and fizzy drinks because they may worsen diarrhea.
How should you drink fluids if you keep vomiting?
Trying to drink a full glass at once can be difficult when your stomach feels unsettled. Instead, use a slow, steady approach:
- Start with small sips. Take a little water or ORS at a time rather than drinking a large amount quickly.
- Drink frequently. Continue offering yourself small amounts at regular intervals, even if you do not feel ready for a full drink.
- Increase gradually. As nausea eases and you can keep fluids down, slowly increase the amount you drink.
- Replace ongoing losses. Continue drinking while vomiting or diarrhea persists, using ORS when fluid and electrolyte losses are significant.
If you vomit after drinking, allow your stomach a brief rest and then try again with smaller, more frequent sips. Do not force yourself to drink a large volume. If even tiny amounts repeatedly come back up, seek medical advice promptly rather than continuing to manage the problem at home.
How should babies, children and older adults rehydrate?
Age matters because babies and young children can become dehydrated more quickly than healthy adults, while older adults may be more vulnerable to dehydration and its complications. People in these groups may need help keeping track of how much they drink and how often they urinate.
Babies and young children
Continue breastfeeding or offer the baby's usual formula at its normal strength. Smaller, more frequent feeds may be easier to tolerate than larger feeds. Do not dilute formula to make it easier to drink. Ask a pediatric healthcare professional about the appropriate use and amount of ORS for an infant, especially a very young baby. For older infants and children, offer an age-appropriate ORS in small, frequent amounts, following the product instructions and any advice from their clinician.
Watch for fewer wet diapers than usual, a dry mouth, few or no tears when crying, unusual sleepiness or fussiness, or difficulty feeding. These signs warrant prompt medical advice. Do not wait for several signs to appear before seeking help if an infant is feeding poorly or has markedly reduced urination.
Older adults and people with other medical conditions
Older adults, people with weakened immune systems, and those with significant ongoing fluid losses should consider seeking medical advice early. People with kidney disease, heart disease or a prescribed fluid restriction may need individualized instructions about the type and amount of fluid they can safely drink. Do not assume that drinking as much as possible is appropriate for everyone with an underlying medical condition.
How can you tell whether rehydration is helping?
As fluid balance improves, you may notice that your mouth feels less dry, thirst decreases, urination becomes more regular, and dizziness when standing eases. Urine may also become lighter in color. These are encouraging changes, but they do not rule out dehydration if other concerning symptoms remain.
The National Library of Medicine's MedlinePlus identifies several possible signs of dehydration, including:
- Urinating less often than usual or passing dark-colored urine.
- Dry mouth and throat or unusual thirst.
- Feeling unusually tired, weak or lightheaded.
- Dizziness when standing or feeling as though you might faint.
- In infants and young children, fewer wet diapers, a lack of tears or unusual sleepiness.
Pay attention to changes over time, particularly whether you can keep fluids down and whether urination returns toward your usual pattern. If symptoms continue or worsen despite drinking ORS, a healthcare professional should assess whether additional treatment is needed.
When should you seek medical help for dehydration?
Home rehydration is not enough for everyone. Seek urgent medical assessment if you or someone you care for cannot keep fluids down, has very little or no urine, experiences persistent dizziness or fainting, or remains dehydrated despite using ORS. Confusion, difficulty waking, collapse or a marked change in responsiveness requires emergency medical attention.
Seek prompt advice for a baby who feeds poorly or has fewer wet diapers, and for a child who is unusually sleepy or cannot drink enough to replace ongoing losses. Adults should also seek medical assessment for persistent or worsening symptoms, particularly if they are older, pregnant, immunocompromised or have significant underlying health conditions. The NIDDK guidance on viral gastroenteritis recommends prompt medical care for signs of dehydration and for people who cannot drink enough fluid or ORS to prevent it.
When dehydration is severe, treatment may require intravenous (IV) fluids given through a vein in a healthcare setting. This can replace fluids when drinking is not sufficient or is not possible. Do not delay seeking care while trying different drinks if concerning symptoms develop.
What should you eat while recovering?
Once your appetite returns, you can usually begin eating your normal foods as tolerated. You do not need to fast or follow a highly restrictive diet simply because you have had norovirus. Start with portions that feel manageable and continue drinking fluids alongside meals. Soup and other foods containing fluid may contribute to your intake, but they should not replace ORS when substantial fluid and electrolyte losses need to be corrected.
The NIDDK's guidance on eating during viral gastroenteritis explains that most people can return to their usual diet when their appetite comes back, even if diarrhea has not completely stopped. Some people find that fatty foods, caffeine or very sugary drinks worsen their symptoms, so it is reasonable to limit these if they make you feel worse.
Continue paying attention to your fluid intake until vomiting and diarrhea have settled and you are drinking and urinating normally again. If recovery is not progressing as expected, or you have difficulty replacing ongoing losses, contact a healthcare professional for advice.