What should you know about IV rehydration therapy?

A clinician places a cannula into a vein and gives a measured fluid solution. Depending on the situation, the solution may contain electrolytes or other prescribed components. IV treatment can be useful when vomiting, severe diarrhoea, swallowing difficulty, or illness makes oral fluids difficult, but it is not a general cure for every episode of tiredness or feeling unwell.

Dehydration may cause thirst, a dry mouth, darker urine, reduced urination, dizziness, or weakness. Severe symptoms need prompt assessment because fluid loss can accompany infection, heat illness, blood loss, or another medical problem. An [IV Vitamin Drip](/treatments/lifestyle-and-wellness/iv-vitamin-drip/) is a different service and should not be assumed to be the right fluid treatment.

For mild fluid loss, ask a clinician or pharmacist which oral fluids are appropriate and take small, frequent sips if you can keep them down. Tell the treating team about heart or kidney disease, pregnancy, allergies, and medicines, because fluid volume and electrolyte content may need careful selection. Do not request added vitamins as a substitute for identifying why dehydration occurred.

Seek urgent medical care for fainting, confusion, severe weakness, breathing difficulty, chest pain, very little urine, blood in vomit or stool, or inability to keep fluids down. After cannula removal, increasing redness, warmth, swelling, pain, or discharge at the site needs medical advice. A worsening illness, high fever, or ongoing diarrhoea also warrants prompt review.

How dehydrated am I, and what is causing the fluid loss? Can oral rehydration work for me? Which solution will be used, and how will my heart and kidneys be considered? What should I drink afterward, and which symptoms mean I need to return for care?