What is Milk of Magnesia (Magnesium Hydroxide)?

Magnesium is a naturally occurring mineral. Magnesium is important for many systems in the body especially the muscles and nerves. Magnesium hydroxide also reduces stomach acid, and increases water in the intestines which may induce defecation.
Magnesium hydroxide is used as a laxative to relieve occasional constipation (irregularity) and as an antacid to relieve indigestion, sour stomach, and heartburn.
Magnesium hydroxide may also be used for purposes other than those listed in this medication guide.

What is the most important information I should know about Milk of Magnesia (Magnesium Hydroxide)?

Before taking magnesium hydroxide, tell your doctor if you have any other medical conditions, allergies, or if you take other medicines or other herbal/health supplements. Magnesium hydroxide may not be recommended in some situations.
Do not use magnesium hydroxide as a laxative if you have stomach (abdominal) pain, nausea, or vomiting, unless directed by a doctor. If you notice a sudden change in bowel habits that persists over a period of 2 weeks, consult your healthcare provider before using a laxative. Magnesium hydroxide should not be used for longer than one week, unless otherwise directed by your healthcare provider. Rectal bleeding or failure to have a bowel movement after use of a laxative may indicate a more serious condition; stop using magnesium hydroxide and contact your healthcare provider.

What should I discuss with my healthcare provider before taking Milk of Magnesia (Magnesium Hydroxide)?

Do not take magnesium hydroxide without first talking to your doctor if you have kidney disease.
Do not use magnesium hydroxide as a laxative if you have stomach (abdominal) pain, nausea, or vomiting, unless directed by a doctor. If you notice a sudden change in bowel habits that persists over a period of 2 weeks, consult your healthcare provider before using a laxative. Magnesium hydroxide should not be used for longer than one week, unless otherwise directed by your healthcare provider. Rectal bleeding or failure to have a bowel movement after use of a laxative may indicate a more serious condition; stop using magnesium hydroxide and contact your healthcare provider.
Before taking magnesium hydroxide, tell your doctor if you have any other medical conditions, allergies, or if you take other medicines or other herbal/health supplements. Magnesium hydroxide may not be recommended in some situations.
It is not known whether magnesium hydroxide will be harmful to an unborn baby. Do not take magnesium hydroxide without first talking to your doctor if you are pregnant or planning a pregnancy.
It is not known whether magnesium hydroxide will be harmful to an nursing baby. Do not take magnesium hydroxide without first talking to your doctor if you are breast-feeding a baby

Milk of Magnesia Side Effects

What are the possible side effects of Milk of Magnesia (Magnesium Hydroxide)?

Stop taking magnesium hydroxide and seek emergency medical attention if you experience an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives).
Other, less serious side effects may be more likely to occur. Continue to take magnesium hydroxide and talk to your doctor if you experience diarrhea or an upset stomach.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome. You may report side effects to FDA at 1-800-FDA-1088.

Milk of Magnesia Interactions

What other drugs affect Milk of Magnesia (Magnesium Hydroxide)?

Before taking magnesium hydroxide, talk to your doctor if you are taking

• a tetracycline antibiotic such as tetracycline (Sumycin, Achromycin V, and others), demeclocycline (Declomycin), doxycycline (Vibramycin, Monodox, Doxy, and others), minocycline (Minocin, Dynacin, and others), or oxytetracycline (Terramycin, and others)
• a fluoroquinolone antibiotic such as ciprofloxacin (Cipro), ofloxacin (Floxin), enoxacin (Penetrex), norfloxacin (Noroxin), sparfloxacin (Zagam), levofloxacin (Levaquin), lomefloxacin (Maxaquin), grepafloxacin (Raxar), and others
• penicillamine (Cuprimine)
• digoxin (Lanoxin, Lanoxicaps); or
• nitrofurantoin (Macrodantin, Furadantin, others)

You not be able to take magnesium hydroxide, or you may require a dosage adjustment or special monitoring during treatment if you are taking any of the medicines listed above.
Drugs other than those listed here can also interact with magnesium hydroxide. Talk to your doctor and pharmacist before taking any over-the-counter or prescription medicines, including vitamins, minerals, and herbal products.

What should I avoid while taking Milk of Magnesia (Magnesium Hydroxide)?

There are no restrictions on food, beverages, or activity while taking magnesium hydroxide unless otherwise directed by your doctor.

Milk of Magnesia Dosage

How should I take Milk of Magnesia (Magnesium Hydroxide)?

Take magnesium hydroxide exactly as directed by your doctor or as directed on the package. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you.
Take the tablets and capsules with a full glass of water.
Chew the chewable tablets thoroughly before swallowing them.
Shake the suspension well before measuring a dose. To ensure that you get the correct dose, measure the liquid form of magnesium with a dose-measuring spoon or cup, not with a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist where you can get one.
Do not use magnesium hydroxide as a laxative if you have stomach (abdominal) pain, nausea, or vomiting, unless directed by a doctor. If you notice a sudden change in bowel habits that persists over a period of 2 weeks, consult your healthcare provider before using a laxative. Magnesium hydroxide should not be used for longer than one week, unless otherwise directed by your healthcare provider. Rectal bleeding or failure to have a bowel movement after use of a laxative may indicate a more serious condition; stop using magnesium hydroxide and contact your healthcare provider.
Do not take more magnesium hydroxide than is directed.
Store magnesium hydroxide at room temperature away from moisture and heat.

What happens if I overdose on Milk of Magnesia (Magnesium Hydroxide)?

Seek emergency medical attention if an overdose is suspected.
Symptoms of an magnesium hydroxide overdose include nausea, vomiting, flushing, low blood pressure, a slow heartbeat, drowsiness, coma, and death.

What happens if I miss a dose of Milk of Magnesia (Magnesium Hydroxide)?

Take the missed dose as soon as you remember. However, if it is almost time for the next dose, skip the dose you missed and take only the next regularly scheduled dose. Do not take a double dose of this medication.
Edited from everydayhealth.com