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Magnesium hydroxide neutralises stomach acid and draws water into the bowel; here it is sold as Calcibrook Forte 1000/240/11mg tablets, a calcium, magnesium and zinc supplement for bone health.
Calcium Carbonate, Magnesium Hydroxide, Zinc Sulphate Monohydrate
1000/240/11mg
Calcibrook Forte is a calcium, magnesium and zinc tablet (1000/240/11mg) taken to top up dietary minerals for bone health, sold in packs of 30 to 120 tablets.
Magnesium hydroxide is a white powder with two ordinary jobs in the gut. It neutralises stomach acid, which is why it turns up in antacids, and it draws water into the bowel, which is why larger doses are used as a laxative. In a bone-health tablet the work is different: here it supplies magnesium, a mineral that teams up with calcium in bone and is used by nerves and muscles. Calcibrook Forte pairs it with calcium carbonate and a small amount of zinc sulphate monohydrate.
Calcium is the main mineral in bone, and what is left over once the skeleton has taken its share is used for nerve and muscle function. Calcibrook Forte comes as tablets in a combined strength of 1000/240/11mg: 1000mg calcium carbonate, 240mg magnesium hydroxide and 11mg zinc sulphate monohydrate. Zinc is a mineral the body needs in tiny amounts, and it appears here at 11mg per tablet alongside the other two. The listing sits in the bone support range and is used for calcium deficiency and to support bone health.
Calcium carbonate is absorbed best when it is taken with food, so take the tablet with a meal and a glass of water. The pack states how many tablets make a dose; that figure is the one to follow, since far more calcium and magnesium than the body needs can build up over time. Plenty of water through the day helps the magnesium part do its work in the bowel.
Mild digestive complaints are the usual ones: indigestion, wind, a bloated feeling, constipation from the calcium or looser stools from the magnesium. Serious problems are uncommon. Very high magnesium levels bring muscle weakness, a slow heartbeat, drowsiness, confusion and, at worst, difficulty breathing; the kidneys clear magnesium, so this is more likely when they are not working well. Long-term use of large calcium carbonate doses can also push blood calcium too high, causing nausea, vomiting, thirst and confusion.
Calcium and magnesium both bind to some medicines in the gut and cut how much of them is absorbed. Tetracycline and doxycycline antibiotics, ciprofloxacin and similar antibiotics, bone medicines such as alendronate, iron tablets and levothyroxine are the main ones, and a gap of a few hours between those and this tablet keeps them working. Store the tablets somewhere dry and cool, well away from the kettle or a sunny windowsill.
Magnesium hydroxide can be ordered online with delivery to Hong Kong. The product listed is Calcibrook Forte tablets, a combination tablet of 1000/240/11mg with calcium carbonate, magnesium hydroxide and zinc sulphate monohydrate. If a parcel does not arrive within the delivery window, or arrives damaged, it is sent again free, and the order is refunded if that is not possible.
The price depends on the strength and pack size you choose. The Calcibrook Forte page shows current prices in HKD or the currency you select.
PockDose does not ask you to upload a prescription when you order magnesium hydroxide. See the ordering FAQ for details.
The three figures are the amounts of calcium carbonate, magnesium hydroxide and zinc sulphate monohydrate in one tablet, in that order. Calcibrook Forte is sold as a combined-strength tablet rather than as separate minerals you measure out yourself.
No — it is sold as a mineral supplement for calcium deficiency and bone health, not as a heartburn remedy. Both calcium carbonate and magnesium hydroxide do neutralise stomach acid, but the amounts here are meant for topping up minerals rather than settling indigestion after a meal.
Adults generally need about a gram of calcium a day from food and supplements together, and rather more in later life. Dairy foods, tinned fish with edible bones, tofu, almonds and green vegetables such as broccoli and curly kale all contribute; a tablet covers the shortfall on days when the diet falls short.
Only slightly. Stand-alone magnesium hydroxide laxatives use far more than the 240mg in this tablet, so you should not expect a bowel movement from it. It can still soften the stool a little, and it is included partly to offset the constipating effect of the calcium carbonate.
Vitamin D helps the gut take up calcium, so the two are usually taken together. Calcibrook Forte contains no vitamin D itself, so it has to come from oily fish, fortified foods, sunlight or a separate supplement.