Fluids are the whole game - most food poisoning resolves on its own in 1 to 3 days, and the real danger is dehydration. Small, frequent sips of water, diluted sports drinks or oral rehydration solution; bland food when you are ready; and watch for the red flags that mean get care.
The playbook: hydrate in small sips - big gulps come back up. Oral rehydration solution beats plain water when vomiting and diarrhea are both going (a homemade version: water plus a little salt and sugar). When food appeals again: bland - rice, toast, bananas, crackers; skip dairy, fatty, spicy and alcohol for a few days. Medications: bismuth (Pepto-Bismol) helps nausea and diarrhea; loperamide (Imodium) slows diarrhea but skip it if you have high fever or bloody stool - slowing things down can worsen some infections. Do not take leftover antibiotics. Red flags that mean get care today: blood in vomit or stool, fever above 102F, signs of dehydration (very dark urine or barely urinating, dizziness standing), severe abdominal pain, symptoms past 3 days, or if the sick person is an infant, pregnant, elderly or immunocompromised - those groups get seen sooner. Emergencies skip this list: chest pain, trouble breathing, stroke signs, severe bleeding, or thoughts of self-harm mean call 911, or 988 for a mental health crisis in the US.
What to do
Common questions
How do I know if it's food poisoning or a stomach virus?
Often you cannot, and it rarely matters - the care is identical (fluids, rest, watch the red flags). Clues that tilt toward food poisoning: symptoms starting within hours of a meal (some bacteria hit in 1 to 6 hours), and multiple people sick after the same food. Norovirus (the 'stomach flu') tends to spread through households over days. Either way, the playbook on this page is the right one.
Should I take Pepto-Bismol or Imodium for food poisoning?
Bismuth (Pepto-Bismol) is the safer default - it calms nausea and diarrhea and has mild antibacterial effects. Loperamide (Imodium) works but has a real caveat: with high fever or bloody diarrhea it can make certain bacterial infections worse by slowing the gut's attempt to flush them. No fever and no blood? It is reasonable. Fever or blood? Skip it and consider getting checked.
When is vomiting and diarrhea an emergency?
When dehydration wins: barely urinating or very dark urine, dizziness or fainting when standing, confusion, or a racing heart. Also: blood in vomit or stool, a fever above 102F that will not settle, severe or localizing abdominal pain (that is not food poisoning's pattern - think appendicitis), and any of these in an infant, an elderly person, a pregnant woman, or someone immunocompromised. Emergencies skip this list: chest pain, trouble breathing, stroke signs, severe bleeding, or thoughts of self-harm mean call 911, or 988 for a mental health crisis in the US.
How long does food poisoning usually last?
Most cases turn the corner in 1 to 3 days, with appetite and energy lagging a few days behind. Diarrhea persisting past 3 days, improving then worsening, or any symptoms past a week deserves a clinician - some infections (like certain E. coli, salmonella, or parasites like giardia) do not follow the usual timeline and need testing or treatment.