1 May 2026Oral drugs

Aluminium hydroxide/Magnesium hydroxide oral

Antacid guidance for gastritis and peptic-ulcer-associated stomach pain, including dose timing and key interaction precautions.

This guide page is for structured reference only and does not replace a clinician, pharmacist, or emergency review. Dose choice, route choice, interactions, and safety decisions still need professional judgment.

Therapeutic action

Antacid.

Indications

Stomach pain associated with gastritis and peptic ulcer.

Forms and strengths

400 mg aluminium hydroxide/400 mg magnesium hydroxide chewable tablet.

Dose

Child over 5 years: rarely indicated. When necessary: half a tablet 3 times daily.
Adult: 1 to 2 tablets 3 times daily 20 minutes to one hour after meals, or 1 tablet during painful attacks.

Duration

According to clinical response.

Contra-indications, adverse effects, precautions

Decreases intestinal absorption of many drugs.
Do not administer simultaneously with atazanavir, chloroquine, digoxin, doxycycline, iron salts, gabapentin, itraconazole, or levothyroxine; take at least 2 hours apart.
For ciprofloxacin, take ciprofloxacin 2 hours before or 4 hours after antacids.
For dolutegravir, take dolutegravir 2 hours before or 6 hours after antacids.
For velpatasvir, take 4 hours apart.
Pregnancy: no contra-indication.
Breast-feeding: no contra-indication.

Source

MSF Essential drugs practical guidelines (January 2026)

This page reproduces the structured reference information for this batch while leaving out the Storage and Remarks sections.

Rate this guide

Be the first to rate this guide.