Vomiting, dehydration and acute kidney injury

Overview

The most serious acute risk for patients with CKD taking GLP-1 medications is dehydration leading to Acute Kidney Injury (AKI). This occurs because vomiting and diarrhoea can cause rapid fluid loss, which the kidneys are already less able to manage.

Why it's done and who it helps

• The "Sick Day Rules": If you are vomiting or have significant diarrhoea, you must stop certain medications (like ACE inhibitors, ARBs, and SGLT2i) and may need to pause your GLP-1 dose.
• Hydration is Mandatory: In CKD, maintaining a steady fluid intake is not optional while on these medications.
• Recognising AKI: A sudden drop in urine output, swelling, or confusion can indicate the kidneys are struggling.

KDIGO and NICE Clinical Standards

• NICE and KDIGO both emphasize the "triple whammy" risk: combining dehydration with specific blood pressure and diabetes medications can cause a sharp drop in kidney function.
• Professor Mohammed Mahdi Althaf provides a personalized "Sick Day" plan at your consultation.

Clinical Monitoring

Every episode of vomiting or prolonged diarrhoea must be reported via the platform to trigger a clinical review and potential blood tests.

Preparing for your appointment

What if I can't keep water down?

This is a medical emergency for CKD patients. You must contact your renal unit or NHS 111 immediately.

Should I stop my jab if I feel sick?

Always consult your care team first, but usually, a dose is paused until you have been symptom-free for 48 hours.

References

• NICE: Acute kidney injury: prevention, detection and management
• KDIGO Clinical Practice Guideline for AKI
• UK Kidney Association (UKKA) Sick Day Rules

This article is general patient information reviewed by a consultant nephrologist. It is not individual medical advice; treatment decisions are made at a face-to-face consultation.