Hydration and electrolytes on GLP-1 treatment

Why fluids matter more now #

Three things change on GLP-1 treatment. You eat less, and food normally provides a fifth of your fluid intake. Vomiting or diarrhoea, when they occur, drain fluids faster. And constipation, the most persistent side effect, is made worse by even mild dehydration.

How much to drink #

Around 2 litres a day for most adults, more in hot weather or after exercise. The reliable signal is urine colour: pale straw is the target. Sipping steadily beats large gulps, which can trigger nausea on a slowed stomach.

When electrolytes matter #

Plain water covers most days. Add electrolytes when you are losing more than usual, vomiting, diarrhoea, heavy sweating, or if you feel light-headed on standing. An oral rehydration sachet from any pharmacy is the balanced option. Sports drinks work in a pinch but carry sugar.

People with kidney or heart conditions should ask their clinician before adding electrolyte supplements routinely.

Habits to make drinking automatic #

• A glass of water beside the tablet or injection, anchor fluids to the dose.
• A bottle within sight all day. Visibility beats discipline.
• Herbal teas count. Caffeinated drinks count partially, but are not your main source.
• If plain water nauseates you early on, drink your water cold, carbonated or with a slice of citrus.