Hydration and electrolytes on GLP-1 medicines

Match the approach to what is happening

Keep a drink accessible. If nausea makes a full glass difficult, small sips may be easier. If vomiting or diarrhoea causes significant fluid loss, a pharmacist can advise whether an oral rehydration solution is appropriate and how to use it.

A sports drink or supplement marketed for GLP-1 users is not the same as a medically appropriate rehydration plan. Mention kidney or heart problems, diabetes and any prescribed fluid restriction before adding products or substantially changing intake.

Watch for a change in urgency

Dark urine, passing much less urine, persistent dizziness on standing or unusual tiredness can signal dehydration. Seek urgent GP advice or NHS 111 help, particularly if you cannot keep fluids down. Confusion, breathing difficulty or being difficult to wake needs emergency help.

Tell the clinician how often you have vomited or had diarrhoea, what you have drunk and when you last passed urine. Keep the medicine name available. Do not wait for a routine review if worsening, or assume an electrolyte sachet makes continued vomiting safe.