No, Do Not Mix GoLYTELY with Gatorade
The FDA-approved GoLYTELY label explicitly states to reconstitute only with water and "Do not add any other ingredients, flavors, etc." 1
Why This Matters
The FDA labeling for GoLYTELY is unequivocal: you must fill the container with lukewarm drinking water to the 4-liter fill line and not reconstitute with other liquids 1. This is a critical safety instruction, not merely a suggestion.
The Confusion: PEG-3350 vs. GoLYTELY
Here's where patients and providers often get confused:
- PEG-3350 powder (MiraLAX) is a different product - an over-the-counter laxative that contains only polyethylene glycol without electrolytes
- GoLYTELY is a prescription formulation containing PEG-3350 plus balanced electrolytes (sodium sulfate, sodium bicarbonate, sodium chloride, and potassium chloride) 1
The research evidence showing PEG mixed with Gatorade 2, 3, 4, 5 refers to PEG-3350 powder (238g MiraLAX), not GoLYTELY. This is an important distinction because:
- PEG-3350 powder lacks electrolytes, so mixing with Gatorade provides some electrolyte replacement
- GoLYTELY already contains a precisely balanced electrolyte formulation designed to prevent electrolyte disturbances 1
Safety Concerns
Mixing GoLYTELY with Gatorade instead of water could dangerously alter the electrolyte balance, potentially leading to:
- Hyponatremia or hypernatremia (abnormal sodium levels)
- Potassium imbalances
- Cardiac arrhythmias 1
- Seizures 1
The FDA warnings specifically highlight that fluid and electrolyte disturbances can lead to serious adverse events including cardiac arrhythmias, seizures, and renal impairment 1. One case report even documented a lethal complication from inappropriately prepared polyethylene glycol solution 6.
What the Guidelines Say
The 2014 and 2025 US Multi-Society Task Force guidelines discuss various PEG formulations but do not endorse mixing FDA-approved electrolyte-containing preparations like GoLYTELY with sports drinks 7. The guideline evidence supporting PEG with Gatorade specifically refers to the off-label use of PEG-3350 powder (an OTC product) mixed with sports drinks 7.
The Correct Approach
For GoLYTELY specifically:
- Mix only with water as directed on the FDA label
- Follow split-dosing recommendations for optimal bowel cleansing 8, 7
- Complete the second portion 4-6 hours before colonoscopy, finishing at least 2 hours before the procedure 8
If tolerability is a concern:
- Discuss alternative FDA-approved lower-volume preparations with your physician
- Consider preparations specifically designed for better taste (like newer flavored formulations)
- The solution can be chilled to improve palatability 1
Common Pitfall to Avoid
Do not confuse online advice about "PEG and Gatorade" preparations with GoLYTELY. That advice applies to over-the-counter PEG-3350 powder (MiraLAX), which is a completely different product without electrolytes. Following that advice with GoLYTELY could result in dangerous electrolyte imbalances.