IV fluids for diarrhoea and vomiting

A clinician checks alertness, thirst, mouth dryness, urine output, pulse, blood pressure and the pattern of fluid loss. IV fluid enters a vein and can restore water and salts while the team looks for the cause. Gastroenteritis and food poisoning are possible causes, but severe abdominal pain or other unusual symptoms need a wider assessment.

IV fluids do not stop diarrhoea or vomiting on their own. Treatment may also involve anti-sickness care, oral rehydration, testing, or treatment for the underlying illness. The plan depends on age, medical conditions and whether you can drink without vomiting.

Take small, frequent sips of water or oral rehydration solution if you are awake and able to swallow. Pause briefly after vomiting, then try again rather than drinking a large amount at once. Avoid preparing food for others while infectious diarrhoea or vomiting may be present, and wash hands carefully.

Tell the clinician about blood or bile in vomit, blood in stool, recent travel, new medicines, suspected food exposure and severe pain. During an IV, report swelling, coolness, redness or discomfort at the cannula site.

Seek urgent care for confusion, fainting, severe weakness, very little urine, inability to keep fluids down, severe or persistent abdominal pain, blood in vomit or stool, a stiff neck, or difficulty breathing.

Children, older adults, pregnant people and those with kidney or heart disease can become unwell sooner. Arrange prompt assessment when vomiting or diarrhoea continues, or when dizziness worsens on standing.

Ask whether oral rehydration is enough, what signs show that IV treatment is working, whether tests are needed, how to manage nausea, and when you can safely resume normal food and drinks.