Magnesium Oxide Dosage

Medically reviewed by Drugs.com. Last updated on Apr 9, 2024.

Applies to the following strengths: 400 mg; 140 mg; 420 mg; 250 mg; 500 mg; 200 mg; base 500 mg; 440 mg (265.3 mg elemental magnesium); 600 mg

Usual Adult Dose for Dyspepsia

400 mg tablets: 1 tablet orally twice a day
Maximum dose: 2 tablets per 24 hour period
Duration of therapy: Up to 2 weeks

Comments:

May have a laxative effect.

Uses: Acid indigestion, upset stomach

Usual Adult Dose for Constipation

Oral:
Caplets (500 mg): 2 to 4 caplets orally daily with a full 8 ounce glass of liquid.

Caplets may be taken all at bedtime or separately throughout the day.

Usual Adult Dose for Vitamin/Mineral Supplementation during Pregnancy/Lactation

Recommended DIETARY intake:
Women 19 to 30 years: 508 mg magnesium oxide (MgOx) (310 mg elemental magnesium) orally daily

Women 31 years and older: 525 mg MgOx (320 mg elemental) orally daily

Men 19 to 30 years: 656 mg MgOx (400 mg elemental) orally daily

Men 31 years and older: 689 mg MgOx (420 mg elemental) orally daily

Maximum SUPPLEMENT dose: 574 mg MgOx (350 mg elemental)

Comments:

There is no upper level of intake for magnesium from food.

Usual Pediatric Dose for Constipation

500 mg caplets:
12 years and older: 2 to 4 caplets orally daily, as a single dose or divided dose
Maximum dose: 4 caplets per day
Duration of therapy: 7 days or less

Comments:

Bedtime is the preferred administration time for a single dose.
Take with a full glass of water.

Usual Pediatric Dose for Vitamin/Mineral Supplementation during Pregnancy/Lactation

Recommended DIETARY intakes:
14 to 18 years:
Males: 672 mg magnesium oxide (MgOx) (410 mg elemental magnesium) per day
Females: 590 mg MgOx (360 mg elemental) per day
Maximum SUPPLEMENT dose (both sexes): 574 mg MgOx (350 mg elemental) per day

9 to 13 years: 394 mg MgOx (240 mg elemental) per day
Maximum SUPPLEMENT dose: 574 mg MgOx (350 mg elemental) per day

4 to 8 years: 213 mg MgOx (130 mg elemental) per day
Maximum SUPPLEMENT dose: 180 mg MgOx (110 mg elemental) per day

1 to 3 years: 131 mg MgOx (80 mg elemental) per day
Maximum SUPPLEMENT dose: 107 mg MgOx (65 mg elemental) per day

7 to 12 months: 123 mg MgOx (75 mg elemental) per day

Birth to 6 months: 49 mg MgOx (30 mg elemental) per day

Comments:

There is no upper level of intake for magnesium from food.

Renal Dose Adjustments

Do not use without physician supervision in patients with renal impairment due to increased risk of hypermagnesemia.

Liver Dose Adjustments

Data not available

Dose Adjustments

Recommended DIETARY intake:
Pregnancy, 14 to 18 years: 656 mg magnesium oxide (MgOx) (400 mg elemental magnesium) per day
Pregnancy, 19 to 30 years: 574 mg MgOx (350 mg elemental) per day
Pregnancy, 31 to 50 years: 590 mg MgOx (360 mg elemental) per day

Lactation, 14 to 18 years: 590 mg MgOx (360 mg elemental) per day
Lactation, 19 to 30 years: 508 mg MgOx (310 mg elemental) per day
Lactation, 31 to 50 years: 525 mg MgOx (320 mg elemental) per day

Maximum SUPPLEMENT dose (all ages, pregnancy or lactation): 574 mg MgOx (350 mg elemental) per day