do you refrigerate milk of magnesia after opening

Daniel Parker

2 min read

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21-02-2025

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Milk of magnesia (MOM), a common over-the-counter laxative, is a suspension of magnesium hydroxide in water. Many people wonder about its storage after opening. The short answer is: yes, you should refrigerate Milk of Magnesia after opening. While it doesn't technically spoil in the same way food does, refrigeration significantly extends its shelf life and maintains its quality.

Why Refrigerate Milk of Magnesia?

Several reasons support refrigerating Milk of Magnesia once opened:

• Preservation of Quality: Refrigeration slows down the degradation of the magnesium hydroxide suspension. While it won't become unsafe, it can become less effective or change in consistency over time, especially at warmer temperatures.

• Preventing Bacterial Growth: While MOM itself is not a breeding ground for bacteria, keeping it cool minimizes the risk of any potential contamination introduced after opening. This is especially crucial if you've been using a shared container.

• Maintaining Consistency: Milk of Magnesia can separate or thicken over time at room temperature. Refrigeration helps maintain its smoother, pourable consistency for easier usage.

How Long Does Milk of Magnesia Last After Opening?

The manufacturer typically indicates an expiration date on the unopened bottle. After opening, refrigeration extends its usable life, generally for 3-6 months. However, always check the product for any changes in appearance or consistency before use. Discard it if you notice:

• Changes in color or odor: Significant changes suggest potential degradation.
• Thickening or separation: The mixture should remain relatively uniform. A significant change indicates reduced efficacy.
• Unusual clumps or particles: This could be a sign of contamination.

How to Properly Refrigerate Milk of Magnesia

Refrigerating Milk of Magnesia is straightforward:

1. Store in its original container: This helps maintain its quality and prevents accidental spills.
2. Keep it tightly closed: Ensure the cap is firmly sealed to prevent contamination and evaporation.
3. Place it in a cool part of the refrigerator: Avoid areas near the door where temperature fluctuations are greater.

When to Discard Milk of Magnesia

Even when refrigerated, Milk of Magnesia will eventually lose its potency. Discard it if:

• The expiration date (on the unopened bottle) has passed: This applies even if refrigerated.
• It's been more than six months since opening: After this period, its effectiveness is uncertain.
• You observe any of the changes mentioned above: Discard if you notice changes in color, odor, consistency, or the presence of unusual particles.

What Happens if You Don't Refrigerate It?

Leaving Milk of Magnesia unrefrigerated won't make it immediately dangerous. However, it could:

• Become less effective: Its active ingredients may degrade more quickly, reducing its laxative effect.
• Change in consistency: It may become thicker, clumpy, or separate, making it less pleasant to use.
• Potentially increase the risk of contamination: Although minimal, the risk slightly increases at room temperature.

Conclusion

While not strictly necessary for a short period after opening, refrigerating Milk of Magnesia is highly recommended. Refrigeration helps maintain its effectiveness, consistency, and prevents potential contamination. By following proper storage guidelines, you can ensure you’re using a safe and effective product each time. Remember to always check for any changes in appearance before use and discard if necessary. If you have any concerns about your Milk of Magnesia or its usage, consult with a pharmacist or your doctor.