Polyethylene Glycol
Miralax is a brand-name over-the-counter osmotic laxative containing polyethylene glycol 3350 (PEG 3350). It is commonly used to treat occasional constipation by softening stool and promoting bowel movements. Miralax is suitable for adults and children when used as directed.
Miralax is an over-the-counter laxative used to treat occasional constipation by drawing water into the intestines to soften stool and stimulate bowel movements.
Key facts at a glance
- RxNorm
- 261575
- Generic
- Miralax
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Miralax is used for the relief of occasional constipation. It is also sometimes prescribed for chronic constipation and for bowel preparation before colonoscopy procedures.
Miralax is an osmotic laxative that works by drawing water into the colon, which helps to soften hard, dry stool and increase bowel movements. It typically produces a bowel movement within 1 to 3 days of use.
Miralax should be mixed with a full glass of liquid and taken orally. It is generally well-tolerated but may cause side effects such as bloating, gas, or nausea. Patients should consult a healthcare provider if constipation persists beyond 7 days. Extended use without medical supervision is not recommended.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy