Frequently Asked Questions

If you have questions, we have answers.

The challenges of constipation can be better managed by understanding the condition. Here are answers to common questions to help you better understand some of the causes of constipation, and how MiraLAX works with the water in your body to hydrate, soften, and ease — unblocking your system naturally.

miralax bottles and boxes of mix in pax

How to Take MiraLAX and Using the Right Dose

  • What time of day should I take MiraLAX?
    There is no recommended time of day to take MiraLAX®. Begin taking MiraLAX® at the first signs of constipation and continue taking until you experience relief (up to 7 days).

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  • How do I take MiraLAX, and what’s the right dose?
    Adults and children 17 years of age and older should take 17 grams of powder. Use the MiraLAX® bottle top to measure 17g by filling to the indicated line in the cap. Mix and dissolve into four to eight ounces of any beverage (hot, cold or room temperature). For children 16 years of age or under, ask a doctor. Single-dose packets of MiraLAX® are also available.

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  • How many days can I use MiraLAX?
    You should use MiraLAX no more than 7 days. If you need to use a laxative for longer than 1 week, stop use and consult your doctor.

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How to Use MiraLAX and What to Expect

  • How long does it take for MiraLAX to work?
    MiraLAX generally produces a bowel movement in 1 to 3 days. Because it works naturally with the water in your body without causing harsh side effects, you do not need to worry about sudden urgency.

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  • Does MiraLAX cause any side effects?
    MiraLAX® does not cause harsh side effects such as gas, bloating, cramping or urgency, only gentle, predictable relief from constipation. When using this product, you may have loose, watery or more frequent stools.

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  • Is MiraLAX safe?
    MiraLAX works with the water in your body to hydrate, soften, and ease—unblocking your system naturally without harsh side effects. If you are taking a prescription drug, you should ask a doctor or pharmacist before use.

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How MiraLAX Fits Into Your Lifestyle

  • Should I use MiraLAX if it’s short-listed or expired?
    It is not recommended to use MiraLAX® beyond the labeled expiration date.

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  • Is MiraLAX gluten-free?
    Yes, MiraLAX is gluten-free, sugar-free, and preservative-free.

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  • Is there a coupon for MiraLAX?
    Yes, follow this link to print a coupon.

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  • Is there any difference between MiraLAX and Prescription (Rx) PEG 3350 (Polyethylene Glycol 3350)?
    MiraLAX is the same as Rx PEG 3350. Shortly after November 2, 2018, you will no longer be able to purchase Rx PEG 3350, but MiraLAX will continue to be available over the counter (OTC).