Magnesium Hydroxide is an over-the-counter medicine. The sections below reproduce one FDA label for it, named under "Label". Products in other forms, strengths or from other makers have their own labels, which can differ.
- Type
- Over the counter (OTC)
- Brand names
- Milk Of Magnesia, Milk Of Magnesia Cherry, Milk Of Magnesia Mint, Milk Of Magnesia Original, Gentle Laxative
- Taken
- Oral
- Label
- Bayer HealthCare LLC., revised August 21, 2026 · full label on DailyMed
Purpose
Saline laxative
What it is used for
relieves occasional constipation (irregularity). This product usually produces bowel movement in 1/2 to 6 hours.
Active ingredient
Magnesium hydroxide USP 1200mg
Do not use
Do not use if you have ever had an allergic reaction to this product or any of its ingredients
Ask a doctor before use if you have
Ask a doctor before use if you have kidney disease a magnesium-restricted diet stomach pain, nausea, or vomiting a sudden change in bowel habits that lasts over 14 days
Ask a doctor or pharmacist before use if you are
Ask a doctor or pharmacist before use if you are taking a prescription drug. This product may interact with certain prescription drugs.
Stop use and ask a doctor if
Stop use and ask a doctor if you have rectal bleeding or no bowel movement after using this product. These could be signs of a serious condition. you need to use a laxative for more than 1 week
Warnings
Do not use Do not use if you have ever had an allergic reaction to this product or any of its ingredients Ask a doctor before use if you have Ask a doctor before use if you have kidney disease a magnesium-restricted diet stomach pain, nausea, or vomiting a sudden change in bowel habits that lasts over 14 days Ask a doctor or pharmacist before use if you are Ask a doctor or pharmacist before use if you are taking a prescription drug. This product may interact with certain prescription drugs. Stop use and ask a doctor Stop use and ask a doctor if you have rectal bleeding or no bowel movement after using this product. These could be signs of a serious condition. you need to use a laxative for more than 1 week
Pregnancy or breastfeeding
If pregnant or breast-feeding If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away.
Keep out of reach of children
Keep out of reach of children.
Dosage:
we do not reproduce dosing instructions. The right dose depends on the person and the condition and is set by the prescriber or pharmacist. Dosage section of the full label.
Magnesium hydroxide in the news
We have not covered this medicine yet. Latest news
Recalls
No recalls matched to this medicine in FDA enforcement reports from the last 3 years (or older ones still open). Search all recalls
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Source: FDA structured product labeling, retrieved through openFDA. Label text is shown as published by the FDA, without editing; long sections are shortened, marked […]. openFDA data are not validated for clinical use — always check the current label and ask a doctor or pharmacist about your own treatment. Set ID 2cee67dd-b71f-32b8-e063-6394a90ae864.