Which is better MiraLAX or Phillips Milk of Magnesia?

Over 4 million Americans suffer from frequent constipation, with many turning to over-the-counter options for relief. When comparing MiraLAX or Phillips Milk of Magnesia, understanding their distinct mechanisms and suitability for different needs is crucial for making the right choice.

Quick Summary

An in-depth comparison of MiraLAX (polyethylene glycol 3350) and Phillips' Milk of Magnesia (magnesium hydroxide), detailing their different modes of action, speed of relief, potential side effects, and ideal use cases. It explores which osmotic laxative is more appropriate for short-term and chronic constipation, highlighting important safety considerations.

Key Points

• Speed and Onset: Phillips' Milk of Magnesia works much faster (30 min-6 hrs) for immediate, acute relief, while MiraLAX takes longer (1-3 days) for gradual, gentle relief.

• Best For Chronic vs. Occasional: MiraLAX is generally the better choice for chronic or frequent constipation due to its gentler action, whereas Milk of Magnesia is ideal for occasional use.

• Active Ingredients Differently: MiraLAX uses polyethylene glycol 3350, which draws water into the stool, while Milk of Magnesia uses magnesium hydroxide, which acts more forcefully.

• Safety Profile Considerations: People with kidney or heart disease should exercise caution with Phillips' Milk of Magnesia due to the risk of magnesium accumulation.

• Side Effects: Milk of Magnesia has a higher likelihood of causing cramps and diarrhea, while MiraLAX's side effects are generally milder, like bloating and gas.

• Usage Duration: MiraLAX is safer for prolonged use under medical supervision, while Milk of Magnesia is intended only for short-term use.

• Dual Purpose of Milk of Magnesia: Phillips' Milk of Magnesia can also act as an antacid, providing relief from heartburn and indigestion, a function MiraLAX does not share.

Understanding How Osmotic Laxatives Work

Both MiraLAX and Phillips' Milk of Magnesia fall into the category of osmotic laxatives, meaning they work by drawing water into the colon. This increased water content softens the stool, making it easier to pass. While the end goal is similar, the active ingredients differ, leading to variations in onset time, intensity, and potential side effects.

MiraLAX's active ingredient is polyethylene glycol 3350 (PEG 3350). This inert polymer is not absorbed by the body. Instead, it remains in the intestinal tract, creating an osmotic gradient that pulls water into the stool. Because it doesn't directly stimulate the nerves in the intestine, its action is generally considered gentler. The onset of action is slower, typically producing a bowel movement within 1 to 3 days. This makes it a preferred choice for managing chronic or occasional constipation with minimal cramping or urgency.

Phillips' Milk of Magnesia, on the other hand, contains magnesium hydroxide. The magnesium ions draw water into the colon, but its action is often faster and more forceful. It usually works within 30 minutes to 6 hours. Due to its faster and more potent effect, it is generally recommended for short-term, acute relief rather than for prolonged, regular use. Overuse or high doses can increase the risk of electrolyte imbalances, especially in individuals with kidney problems.

Which Laxative for Your Specific Needs?

Choosing between MiraLAX and Phillips' Milk of Magnesia depends heavily on your specific symptoms and health profile. For long-term management of chronic constipation, MiraLAX is often the superior option due to its gentle action and lower risk of disrupting electrolyte balance. It works predictably and can be used daily for up to a week, or longer under a doctor's supervision. Its gentle nature also means less potential for cramping, bloating, and gas compared to some other laxatives.

Conversely, for quick, one-time relief from occasional constipation, Phillips' Milk of Magnesia is a highly effective solution. Its rapid onset makes it useful for resolving sudden bouts of irregularity. However, its stronger, more immediate effect means there's a higher chance of experiencing side effects like cramping and diarrhea. It is not recommended for routine or chronic use, particularly for individuals with kidney or heart conditions, who are at a higher risk of magnesium buildup in the body.

Comparison Table: MiraLAX vs. Phillips' Milk of Magnesia

Feature	MiraLAX (PEG 3350)	Phillips' Milk of Magnesia (Magnesium Hydroxide)
Mechanism	Osmotic; draws water into stool gently.	Saline osmotic; draws water and increases peristalsis more forcefully.
Speed of Action	Gradual; 1 to 3 days for a bowel movement.	Fast; 30 minutes to 6 hours for relief.
Best For	Chronic, long-term or gentle occasional constipation.	Quick, short-term relief from acute constipation.
Key Side Effects	Bloating, gas, nausea, cramping.	Abdominal cramping, bloating, diarrhea.
Long-Term Use	Generally safer for extended use under medical guidance.	Not recommended for long-term use due to potential electrolyte issues.
Other Uses	Bowel preparation for medical procedures.	Also an antacid for stomach acid relief.
Precautions	Avoid if bowel obstruction is suspected.	Caution with kidney or heart disease due to magnesium.

Considerations for Choosing a Laxative

1. Read the Label: Always follow the dosage instructions and usage warnings on the packaging. Do not exceed the recommended dose without consulting a healthcare provider.
2. Stay Hydrated: Both laxatives work by pulling water into the intestines. Drinking plenty of fluids is essential to help them function effectively and prevent dehydration.
3. Monitor Side Effects: Pay attention to how your body responds. If you experience severe cramping, rectal bleeding, or worsening abdominal pain, stop use and seek medical advice immediately.
4. Consult a Doctor: If constipation persists for more than a week, or if you have underlying health conditions like kidney or heart disease, it is crucial to speak with a healthcare professional before starting or continuing a laxative regimen.

Conclusion

Deciding whether MiraLAX or Phillips' Milk of Magnesia is better depends on your need for either gentle, long-term management or rapid, short-term relief. MiraLAX is the gentler option, making it suitable for chronic use and those who want to avoid intense urgency. Phillips' Milk of Magnesia, while faster-acting, is better reserved for occasional, acute constipation due to its more potent effect and potential side effect profile. Always consider your personal health needs and discuss any prolonged use with a healthcare provider.

Additional Tips for Managing Constipation

• Increase Fiber Intake: Incorporate more fiber-rich foods like fruits, vegetables, and whole grains into your diet.
• Stay Active: Regular physical activity can help stimulate bowel movements.
• Establish a Routine: Try to go to the bathroom at the same time each day to train your body's natural rhythm.
• Mindful Hydration: Drink plenty of water throughout the day, not just when taking a laxative.
• Listen to Your Body: Don't ignore the urge to have a bowel movement, as delaying can worsen constipation.

For more information on the active ingredient in MiraLAX, polyethylene glycol 3350, you can review its clinical profile on the Cleveland Clinic website.

Frequently Asked Questions

Can I take MiraLAX and Phillips' Milk of Magnesia at the same time?

No, it is not recommended to take MiraLAX and Phillips' Milk of Magnesia at the same time unless directed by a healthcare professional. Combining osmotic laxatives can lead to excessive diarrhea, cramping, and a greater risk of dehydration and electrolyte imbalance.

Which is safer for long-term use?

MiraLAX is considered safer for long-term or chronic use, especially under a doctor's guidance. Phillips' Milk of Magnesia should only be used for short periods because prolonged use can lead to dependency and potential electrolyte imbalances due to its magnesium content.

Is one better for severe constipation?

For immediate relief from severe or acute constipation, Phillips' Milk of Magnesia may be more effective due to its faster action. However, MiraLAX is often a better choice for managing persistent or chronic constipation more gently over time.

Does Milk of Magnesia have other uses?

Yes, Phillips' Milk of Magnesia can also be used as an antacid to relieve symptoms of upset stomach, indigestion, and heartburn. MiraLAX does not have antacid properties and is used exclusively for constipation.

Can children take these laxatives?

It is crucial to consult a pediatrician before giving either laxative to children. Dosing for MiraLAX in children should be guided by a doctor, and Milk of Magnesia is not recommended for children under six without medical advice.

Which laxative causes less bloating and gas?

MiraLAX is generally associated with less gas and bloating compared to other osmotic laxatives like Milk of Magnesia. However, bloating and gas are common side effects for both, particularly in the initial days of use.

Should people with kidney disease avoid either laxative?

Yes, individuals with kidney disease should avoid Phillips' Milk of Magnesia or use it with extreme caution and medical supervision. The kidneys are responsible for clearing excess magnesium from the body, and impaired function can lead to unsafe buildup.