Magnesia phosphorica

What is Magnesia phosphorica?Magnesia phosphorica

Magnesia phosphorica is a homeopathic medicine prepared from Magnesium phosphate (MgHPO4). It is a white crystalline powder. The process of preparing the homeopathic medicine Magnesia phosphorica involves significantly diluting its raw material, Magnesium phosphate. Click here to learn more about the dilution process and why homeopathic medicines should not be confused with their raw materials.

What is homeopathic Magnesia phosphorica typically used to treat?

Homeopathic Magnesia phosphorica has many indications but is typically used to treat:

  • Spasmodic pain in the abdomen improved by heat, by bending over and applying pressure
  • Fleeting cramps from overexertion (musician’s cramps, writer’s cramps)
Common brands containing Magnesia phosphorica:
  • Boiron®
  • Hyland’s®
  • Similasan

How much homeopathic Magnesia phosphorica can you take?

Magnesia phosphorica may be found in products where it is the only active ingredient or in combination products containing two or more homeopathic active ingredients.

Different types of medicines containing this active ingredient have different purposes and directions. That is why it is always important to read and follow the Drug Facts label. The Warning section indicates how many days of self-treatment are safe. After this time, stop use and ask a doctor if symptoms persist or worsen.

Safety guide for Magnesia phosphorica

Most over-the-counter (OTC) homeopathic ingredients are dilutions of the raw material. The level of dilution is identified on a homeopathic medicine’s Drug Facts label. The Homeopathic Pharmacopoeia of the United States (HPUS) established that OTC homeopathic medicines containing 1X and higher dilutions of Magnesia phosphorica are safe for adults and children.

Therapeutic claims for Magnesia phosphorica are based on traditional homeopathic practice, not accepted medical evidence. Homeopathic products are not evaluated by the U.S. Food and Drug Administration.

Ask a healthcare provider before use if:

  • You are pregnant or breastfeeding.

Do not use if:

  • Do not use more than the Drug Facts label instructs unless instructed by a healthcare provider.

Stop use and ask a doctor if:

  • Your condition gets worse or if symptoms persist for more than the duration displayed on the Drug Fact label, usually 3 to 7 days.
  • Your symptoms clear up and return within a few days.
  • You have an unexpected reaction. Get medical help right away.
  • You develop new symptoms.
  • You take too much. Immediately contact a healthcare provider or the poison control national helpline right away at 800.222.1222.


The Homoeopathic Pharmacopoeia of the United States (HPUS) is the official guidebook that outlines standards of identity and purity that homeopathic medicines must meet.

Materia Medica (or “materials of medicine”) contains information about the specific symptoms of disease and the homeopathic medicines used for their treatment.