Magnesium Citrate
Magnesium citrate is an osmotic laxative that treats occasional constipation by drawing water into the intestines to soften stool and promote bowel movements.
Magnesium citrate is an over-the-counter laxative that relieves occasional constipation by drawing water into the bowels to soften stool and stimulate evacuation.
Key facts at a glance
- ATC
- A06AB06
- RxNorm
- 11164
- Generic
- Magnesium Citrate
- Class
- atc-a06
- Brands
- Citroma
- Availability
- otc
- Pregnancy
- C
- Lactation
- safe
- Half-life (h)
- 4
- Onset (min)
- 0
- Duration (h)
- 6
- Routes
- oral
- Forms
- powder, oral solution
- Regions
- US, AU, CA
- Monitoring
- electrolyte balance, renal function
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Magnesium citrate is primarily used to relieve occasional constipation and to empty the bowels before medical procedures such as colonoscopies or surgery. It may also serve as a magnesium supplement when used in lower doses for individuals with magnesium deficiency.
As an osmotic laxative, magnesium citrate works by drawing water into the colon through osmosis. This increased water content softens hard, dry stool and increases its volume, which stimulates peristalsis (muscle contractions) and promotes bowel movements. The citrate component also has a mild stimulating effect on intestinal motility.
Magnesium citrate should not be used for prolonged periods without medical supervision, as overuse may lead to electrolyte imbalances, particularly in magnesium and potassium levels. Individuals with kidney disease, heart conditions, or on certain medications should consult a healthcare provider before use. It typically produces results within 30 minutes to 6 hours of administration. Always follow product labeling or physician instructions regarding dosage and duration.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy