GLP-1 Water Intake Calculator
Calculate your optimal daily hydration — adjusted for GLP-1 thirst suppression, GI side effects, and clinical guidelines.
Based on IOM & PENG Clinical Standards
Uses the PENG weight-based formula (35 mL/kg/day), IOM Adequate Intake floors, ACSM activity guidelines, and GLP-1-specific adjustments from published multidisciplinary consensus.
Important — Not Medical Advice
This calculator provides general guidance based on published clinical standards and consensus guidelines. It does not replace personalized advice from your healthcare provider. Fluid needs vary based on individual health conditions, kidney function, and other factors. Always consult your doctor.
What This Calculator Targets
GLP-1s slow gastric emptying and reduce both food and fluid intake. Most users need slightly more water than baseline because they get less water from food, and dehydration drives the two most common GLP-1 complaints — constipation and nausea. This calculator gives you a daily target based on body weight, activity level, and climate.
Who Is This For?
Anyone on a GLP-1, especially during the first 8 weeks and at every dose increase. If you struggle with constipation, fatigue, headaches, or muscle cramps on your medication, dehydration is often the first place to look.
Frequently Asked Questions
How much water should I drink on Ozempic?
Most GLP-1 users need 80–100 oz (2.4–3 L) daily — slightly more than baseline because reduced food intake means less water from food.
Why am I constipated on Ozempic?
GLP-1s slow gastric emptying and reduce both food and fluid intake. Low water and low fiber are the two biggest constipation drivers.
Does electrolyte water help on a GLP-1?
Yes — sodium, potassium, and magnesium can ease cramping, fatigue, and constipation, especially during dose escalations.
Can I drink coffee on a GLP-1?
Yes, but coffee can worsen reflux and nausea on GLP-1s. Count coffee toward fluid totals only if it does not trigger symptoms.
Related Reading
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These tools are for informational purposes only and do not constitute medical advice. Always consult your healthcare provider.
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