Gastroenteritis Treatment Online & Prescription

Key facts

Treated online: Yes, usually. Video assessment, with a prescription when appropriate.
Most gastroenteritis is viral and settles within about a week; the main clinical task is preventing dehydration, especially in children and older adults.
Stay off work, school or nursery until 48 hours after the last episode of vomiting or diarrhoea.
Oral rehydration solution replaces salts and sugar in the proportions the gut absorbs best; sip small amounts often.
If someone is confused, floppy or hard to wake, call 112 now.

Check before you book

A baby or small child who is drowsy, has sunken eyes, dry nappies, no tears or cold hands and feet needs urgent in-person care, not a video call. The same urgency applies to any age with blood in the stool, a high fever that will not settle, or inability to keep any fluid down. If someone is confused, floppy or hard to wake, call 112 now.

Can an online doctor treat gastroenteritis?

Yes

Gastroenteritis: usually treated online.

Yes, for most cases. Gastroenteritis, the classic stomach bug with vomiting and diarrhoea, is usually viral and self-limiting, so treatment centres on preventing dehydration rather than on medicines.^[1] Mobi Doctor, an online healthcare service with licensed doctors, assesses hydration on camera, builds a recovery plan, and prescribes where assessment supports it. Children with dehydration signs, blood in the stool or a patient who cannot drink need in-person care, and testing routes vary by country.

There is also an infection-control argument for staying on your sofa: stomach bugs are ferociously contagious, and a waiting room is the perfect place to donate yours to a dozen strangers.

Listen: Gastroenteritis Treatment Online

The audio version of this topic from the Mobi Doctor podcast. Open the episode.

How an online consultation helps with gastroenteritis

Dehydration checked properly:

the doctor walks through urine output, thirst, dizziness and, for children, the specific signs that matter (nappies, tears, alertness, breathing), and tells you clearly which side of the line you are on.^[4]

A fluid plan by age:

how much, how often, and when plain water is not enough: oral rehydration salts for children, older adults and heavy losses, in small frequent sips that stay down.

Medicines paused before they bite:

diuretics, some blood-pressure tablets and metformin can turn a routine stomach bug into kidney trouble while you are dry. The doctor tells you what to stop and when to restart.

Household damage control:

practical isolation and hygiene rules that actually stop the spread, plus the 48-hour rule for returning to school, work and food handling.^[1]

What the doctor checks in an online gastroenteritis consultation

The consultation is built around one question, how dry are you and how fast are you drying out, plus a screen for the cases that are not simple viral illness. The doctor will typically establish:

Losses versus intake: how often you are vomiting and passing stool, what you have managed to drink and keep down in the last six hours.
Hydration signs on camera: for adults, urine colour and frequency, dizziness on standing, dry mouth; for children, alertness, sunken eyes, tears when crying, wet nappies, and how the child looks and behaves on screen.^[4]
Who is ill: age (under 5s and over 65s carry the highest risk), pregnancy, immune suppression, kidney disease, diabetes, and frailty.
The exposure story: household or workplace outbreaks, nursery contacts, a suspect meal, recent travel, recent antibiotics (which raises a different, treatable cause of diarrhoea).
Regular medicines: which need pausing during fluid loss, and which make dehydration more dangerous.
Red flags: blood or mucus in the stool, high persistent fever, severe localised pain, confusion, no urine for many hours, symptoms beyond a week.

What causes gastroenteritis?

Viruses cause the large majority of cases. Norovirus leads in adults and causes the explosive winter outbreaks that empty offices and cruise ships; rotavirus historically led in young children, though vaccination has cut its impact across much of Europe.^[3] Bacteria such as campylobacter and salmonella account for a smaller share, usually foodborne, and parasites are rarer again, mostly after travel. The practical point cuts through the microbiology: whatever the organism, the illness usually looks the same and the first-line treatment, fluids and time, is identical.^[1]^[2]

Is it gastroenteritis, norovirus or food poisoning?

These three labels overlap, and sorting them takes one sentence each. Gastroenteritis is the umbrella term for gut infection with vomiting and diarrhoea, whatever the cause. Norovirus is the single commonest virus behind it, spreading person to person with dramatic speed. Food poisoning is gastroenteritis you caught from what you ate rather than from someone infectious.

The label changes the follow-up more than the treatment. If your illness marched through the household one person at a time, it behaves like norovirus, and our norovirus page covers the outbreak-control side. If it arrived hours after a suspect meal, or several people who shared food went down together, the foodborne angle, stool tests and reporting are covered on the food poisoning page. And if loose stools are the whole story, without much vomiting, start at the diarrhoea page, because longer-running diarrhoea has its own list of causes worth ruling out.

When should I worry about dehydration?

Worry when fluid stops going in or stops staying in. The warning signs are passing little or no urine, dizziness on standing, drowsiness or confusion, and in children: sunken eyes, no tears, dry nappies, unusual sleepiness or fast breathing. These signs mean same-day medical review, in person where they are marked.^[4]

Children first

Small children dehydrate fastest because their reserves are smallest and their losses, per kilo, are biggest. Vomiting alone for more than a day, refusal to drink, or any of the signs above should lower your threshold to seek care to the floor. Oral rehydration solution given as frequent small sips (a syringe or spoon works when a cup is refused) is the evidence-based home treatment; fizzy drinks and undiluted juice make diarrhoea worse.^[2]^[4]

Older adults and the medicines problem

In older people, dehydration often announces itself as confusion, unsteadiness or a fall rather than thirst. The stakes are raised by everyday prescriptions: diuretics and certain blood-pressure medicines keep pulling fluid and salt out of a body that is already losing both, and metformin becomes riskier as the kidneys dry. This is the single most useful reason for an older person with a stomach bug to speak to a doctor early: a two-minute medicine review can prevent the complication that would have caused a hospital admission.

Do I need antibiotics for gastroenteritis?

Almost never. Most gastroenteritis is viral, and antibiotics do nothing against viruses; they are only prescribed when there are signs of a specific bacterial infection where treatment helps, because unnecessary courses cause side effects and fuel antibiotic resistance.^[1] Even most bacterial cases clear on their own, and in some (notably certain E. coli infections) antibiotics can make complications more likely rather than less. The exceptions, severe illness, immunosuppressed patients, specific organisms confirmed on stool testing, are exactly what the consultation screens for. An honest doctor treats the fluid problem first and reserves the prescription pad for the cases that need it.

Is my gastroenteritis suitable for online care?

Usually yes, with predictable exceptions. This is the decision framework our doctors use, aligned with the cited guidance.

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Gastroenteritis presentations, the likely first step, and when in-person care is needed, aligned with cited guidance
Presentation	Likely first step	Suitable for online care?	When referral or in-person care is needed
Adult with vomiting and diarrhoea, drinking and passing urine	Fluid-first plan, hygiene rules, safety-netting	Usually yes	Red flags appear, or no improvement after about 48 hours
Child who is alert, drinking, with wet nappies	Oral rehydration solution in frequent small sips^[4]	Often yes, with clear escalation rules	Any dehydration sign, blood in stool, or a baby under 6 months
Older adult, or anyone on diuretics, blood-pressure tablets or metformin	Early review with medicine-pause plan	Usually yes, seen promptly	Confusion, falls, very low urine output, or kidney concerns
Blood in stool, high persistent fever, or recent travel outside Europe	Assessment plus stool testing pathway^[1]	For triage and organising tests	In-person review if unwell or worsening
Cannot keep any fluid down, confusion, drowsiness, no urine	Emergency care	No	Call 112 immediately

Availability of individual medicines and who may prescribe them vary by country; your doctor confirms what applies where you are.

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Treatment options for gastroenteritis

What you can do yourself

Drink small amounts often; large gulps come straight back. Oral rehydration salts from any pharmacy are the gold standard for children, older adults and anyone with heavy losses, because they replace salts and sugar in the proportions the gut absorbs best.^[2]^[5] Eat when appetite returns, keeping it small and bland at first; there is no evidence that starving shortens the illness. Rest, and stay home until 48 hours after the last episode of vomiting or diarrhoea, the standard exclusion window for work, school and nursery, applied strictly to food handlers and carers.^[1] At home, soap and hot water beat alcohol gel against norovirus, and towels stop being communal property until everyone is clear.

Prescription treatment

A prescription is never issued without a consultation. Where assessment supports it, the doctor can prescribe an anti-sickness medicine so fluids stay down, advise on loperamide for adults who must function (never with blood in the stool or high fever, and not for young children), organise stool testing for the presentations that warrant it, and prescribe antibiotics only in the narrow circumstances described above. Prescribing rules vary by country; your doctor confirms what applies to you.

When we treat gastroenteritis online, and when we refer you

We treat online: typical stomach bugs in adults and in children who are alert and drinking; hydration plans with clear escalation rules; medicine-pause reviews for older and chronically ill patients; anti-sickness treatment where appropriate; stool-test organisation for travel-related or prolonged cases; and return-to-work and outbreak-hygiene advice.

We refer or redirect you: babies under 6 months with vomiting and diarrhoea, and any child with dehydration signs, go to in-person care the same day;^[4] blood in the stool or persistent high fever needs examination and testing; anyone who cannot keep fluids down despite treatment needs assessment for intravenous rehydration; and diarrhoea that has run past two weeks stops being gastroenteritis and starts being a work-up, which we arrange. If we cannot help online, you get a full refund and clear directions to the right care.

When to get in-person care

Seek same-day in-person care for blood in the stool, high fever that will not settle, dehydration signs in a child (sunken eyes, dry nappies, no tears, drowsiness), or an older person who becomes confused or unsteady. Call 112 immediately if someone cannot be roused, is floppy or limp, has cold mottled skin, or has passed no urine for many hours despite trying to drink.

How Mobi Doctor works

Book a time that suits you: open daily 7am–11pm, often the same day, with the exact price, €47, shown before you pay.
Speak to a licensed doctor about gastroenteritis: a private video consultation, from anywhere in Europe.
Get your fluid plan and escalation rules: if treatment is right for you, the prescription follows the consultation. If we can’t help you online, you get a full refund.

Frequently asked questions about gastroenteritis

Can an online doctor prescribe medicine for gastroenteritis in Europe?

Yes, where assessment supports it: typically anti-sickness medicine to help fluids stay down. Antibiotics are rarely appropriate, because most gastroenteritis is viral. A prescription is never issued without a consultation, and prescribing rules vary by country; your doctor confirms what applies to you.

How much does a gastroenteritis consultation cost?

A video consultation costs €47. The exact price is shown before payment, and there is no subscription. If the doctor can’t treat you online, you get a full refund and clear directions to the right care.

How quickly can I speak to a doctor about a stomach bug?

Usually the same day. Appointments run daily from 7am to 11pm, and with a stomach bug the early decisions, fluid plan, medicine pauses, whether a child needs in-person care, are the ones that matter most.

How long does gastroenteritis last?

Vomiting usually settles within one to two days; diarrhoea commonly lasts three to seven. Adults improving within that window rarely need tests. See a doctor if vomiting passes two days, diarrhoea passes a week, or any red flag appears sooner.

What should I give a child with a stomach bug to drink?

Oral rehydration solution from a pharmacy, offered as small frequent sips, by spoon or syringe if a cup is refused. Continue breastfeeding as normal. Avoid fizzy drinks and undiluted fruit juice, which draw water into the gut and worsen diarrhoea.

When can my child go back to school or nursery?

48 hours after the last episode of vomiting or diarrhoea. Earlier return is the engine of nursery outbreaks, because children remain infectious while they feel better. The same 48-hour rule applies to adults returning to work, and strictly so for food handlers.

Is gastroenteritis the same as food poisoning?

They overlap. Gastroenteritis is the umbrella term for gut infections causing vomiting and diarrhoea; food poisoning is the subset caught from contaminated food rather than from an infected person. Symptoms and treatment are largely identical, so the label matters mainly for reporting and preventing further cases.

Sources & further reading

Gastroenteritis: Clinical Knowledge Summary, NICE, National Institute for Health and Care Excellence, 2023.
Diarrhoeal disease fact sheet, WHO, World Health Organization, 2024.
Norovirus infection, ECDC, European Centre for Disease Prevention and Control, 2024.
Diarrhoea and vomiting caused by gastroenteritis in under 5s (CG84), NICE, National Institute for Health and Care Excellence, 2009.
Reduced osmolarity oral rehydration solution for treating dehydration caused by acute diarrhoea in children (Cochrane Review), Cochrane, Cochrane Collaboration, accessed August 2026.

This page is for information only and is not a substitute for a medical consultation. Guideline links are provided for transparency; treatment decisions are made with your doctor.

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