magnesium hydroxide (OTC)

Constipation

Magnesium hydroxide (400 mg/5 mL): 30-60 mL/day PO at bedtime or in divided doses

Magnesium hydroxide (800 mg/5 mL): 15-30 mL/day PO at bedtime or in divided doses

Chewable tablet: 8 tablets/day PO at bedtime or in divided doses

Acid Indigestion

Magnesium hydroxide (400 mg/5 mL): 5-15 mL PO q4hr; no more than 4 doses per 24-hour period

Chewable tablet: 2-4 tablets PO q4hr; no more than 4 doses per 24-hour period

Constipation

<2 years: Safety and efficacy not established

Suspension

• 2-6 years: 5-15 mL/day of regular-strength liquid PO at bedtime or in divided doses
• 6-12 years: 15-30 mL/day (400 mg/5 mL) or 7.5-15 mL/day (800 mg/5 mL) PO at bedtime or in divided doses
• ≥12 years: 30-60 mL/day (400 mg/5 mL) or 15-30 mL/day (800 mg/5 mL) PO at bedtime or in divided doses

Chewable tablet

• <3 years: Not recommended
• 3-6 years: 2 tablets PO once daily or in divided doses
• 6-12 years: 4 tablets PO once daily or in divided doses
• >12 years: 8 tablets PO once daily or in divided doses

Acid Indigestion

Liquid

• <12 years: Not recommended
• ≥12 years: 5-15 mL (400 mg/5 mL) PO q4hr; no more than 4 doses per 24-hour period

Chewable tablet

• <12 years: Not recommended
• ≥12 years: 2-4 tablets PO q4hr; no more than 4 doses per 24-hour period