Skip to Content

Magnesium Carbonate Dosage

Applies to the following strengths: 54 mg/5 mL; 5%; 250 mg

Usual Adult Dose for:

Usual Pediatric Dose for:

Additional dosage information:

Usual Adult Dose for Dietary Supplement

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 Adult Dose for Dyspepsia

10 mL (250 mg/5 mL suspension) orally every 3 to 4 hours as needed
Maximum dose: 40 mL/day
Duration of therapy: Up to 2 weeks

Usual Pediatric Dose for Dietary Supplement

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

Usual Pediatric Dose for Dyspepsia

12 years and older: 10 mL (250 mg/5 mL suspension) orally every 3 to 4 hours as needed
Maximum dose: 40 mL/day
Duration of therapy: Up to 2 weeks

6 to 12 years: 5 mL (250 mg/5 mL suspension) orally every 3 to 4 hours as needed
Maximum dose: 20 mL/day
Duration of therapy: Up to 2 weeks

Renal Dose Adjustments

Use with caution.
-Hypermagnesemia risk is increased in renal impairment.
-The risk of magnesium toxicity is increased in renal impairment and failure because of reduced ability to remove excess magnesium.
-In mild renal impairment, fractional excretion of magnesium increases to compensate for loss of glomerular filtration, but this becomes inadequate by the time creatinine clearance is under 30 mL/min.
-Hypermagnesemia is common with creatinine clearance under 10 mL/min.
-Monitor magnesium levels.
-Use as a carminative is not recommended in renal impairment.

Liver Dose Adjustments

Data not available

Dialysis

Dose adjustment(s) may be required; however, no specific guidelines have been suggested. Caution is recommended.
-Effects are similar in both hemodialysis and peritoneal dialysis.
-Hypermagnesemia is common with creatinine clearance under 10 mL/min.
-Mild hypermagnesemia is common with a dialysate magnesium of 0.75 mmol/L
-Serum magnesium was normal to low with a dialysate magnesium between 0.2 and 0.25 mmol/L.
-Ionized serum, ionized mononuclear and red blood cell measurements are not useful for hypermagnesemia detection.

Other Comments

Administration advice:
-Shake suspension well before using.

Patient advice:
-This drug may have a laxative effect.

Further information

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