Magnesium Chloride Dosage

Medically reviewed by Drugs.com. Last updated on Jun 18, 2025.

Usual Adult Dose for Hypomagnesemia

1 to 40 grams intravenously daily

• Use serum magnesium levels to guide dosage

Maximum rate: 3 mL/min

Use: Electrolyte replenisher in magnesium deficiencies

Usual Adult Dose for Vitamin/Mineral Supplementation

Recommended dietary intake (RDA) for magnesium:
18 years, male: 410 mg
18 years, female: 360 mg
19 to 30 years, male: 400 mg
19 to 30 years, female: 310 mg
31 years and older, male: 420 mg
31 years and older, female: 320 mg

Tolerable upper intake level (UL) for supplemental magnesium: 350 mg

Usual Pediatric Dose for Vitamin/Mineral Supplementation

Recommended dietary intake (RDA) for magnesium:
Birth to 6 months: 30 mg (adequate intake)
7 to 12 months: 75 mg (adequate intake)
1 to 3 years: 80 mg
4 to 8 years: 130 mg
9 to 13 years: 240 mg
14 to 18 years, male: 410 mg
14 to 18 years, female: 360 mg

Tolerable upper intake level (UL) for supplemental magnesium:
1 to 3 years: 65 mg
4 to 8 years: 110 mg
9 to 18 years: 350 mg

Renal Dose Adjustments

Contraindicated in renal impairment

Liver Dose Adjustments

Data not available

Dose Adjustments

US: Recommended dietary intake (RDA) for magnesium:
Pregnancy:

• 14 to 18 years: 400 mg
• 19 to 30 years: 350 mg
• 31 to 50 years: 360 mg

Lactation:

• 14 to 18 years: 360 mg
• 19 to 30 years: 310 mg
• 31 to 50 years: 320 mg

Precautions

CONTRAINDICATIONS:

• Renal impairment
• Marked myocardial disease
• Comatose patients

Consult WARNINGS section for additional precautions.

Dialysis

Data not available

• Contraindicated in renal impairment

Other Comments

Administration advice:

• Maximum infusion rate: 3 mL/min

Storage requirements:

• Store at controlled room temperature

Reconstitution/preparation techniques:

• Dilute 4 grams in 250 mL 5% dextrose

Frequently asked questions

• When is the best time to take magnesium, morning or night?
• Should I take magnesium with or without food?
• Does magnesium help with restless leg syndrome (RLS)?
• Does magnesium help with headaches and migraines?
• Does magnesium help with weight loss?

See also:

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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