Al/Mg antacid
MAALOX / MYLANTA
What it isCombination antacid pairing aluminum hydroxide with magnesium hydroxide to neutralize gastric acid.
Why this oneBalances aluminum’s constipation against magnesium’s laxative effect for better GI tolerability than either alone.
What limits itLike other polyvalent-cation antacids it binds fluoroquinolones, tetracyclines, and other drugs, and both cations can accumulate dangerously in renal impairment.
Principal riskNo FDA boxed warning.
Classes and tags
Clinical profile
FDA label
Read the full label on DailyMed ↗
NO BOXED WARNINGS
| FDA dosing | Population | Start | Target | Max |
|---|---|---|---|---|
| Heartburn, acid indigestion, sour stomach, upset stomach, gas pressure/bloating (antacid/anti-gas) | Adults & children ≥12 y | 10–20 mL (1–2 doses) between meals and at bedtime PRN, or as directed by a doctor | 10–20 mL between meals and QHS PRN | 60 mL (6 doses)/24 h; max dosage ≤2 weeks |
| Heartburn, acid indigestion, sour stomach, upset stomach, gas pressure/bloating (antacid/anti-gas) | Children <12 y | Ask a doctor | Ask a doctor | Undefined |
Renal Undefined
Hepatic Undefined
Each 10 mL dose contains magnesium 340 mg, sodium 7 mg.
Instructions
- Shake well before use
- Measure with dosing cup provided
- Do not use the maximum dosage for more than 2 weeks
Available strengths
- susp 800/800/80 mg/10 mL
- susp 1200/1200/120, 2400/2400/240 mg/30 mL
- susp 200/200/20, 400/400/40 mg/5 mL
- sol 12.38/40/400 g/20 g
- sol 400/400/40, 800/800/80 mg/10 mL
- sol 200/200/20 mg/5 mL
Cautions
- Ask a doctor before use if kidney disease or magnesium-restricted diet
- Ask a doctor/pharmacist if taking a prescription drug (antacids may interact)
Cost
Al/Mg antacid (MAALOX / MYLANTA)
What pharmacies pay · NADAC 9/30/26 · OTC
| Strength | #/mo | generic $/unit | CostPlus | |
|---|---|---|---|---|
| 800/800/80 mg/10 mL | susp | per unit | $0.01/mL | not offered |
| 1200/1200/120 mg/30 mL | susp | per unit | not offered | |
| 2400/2400/240 mg/30 mL | susp | per unit | not offered | |
| 200/200/20 mg/5 mL | susp | per unit | $0.01/mL | not offered |
| 400/400/40 mg/5 mL | susp | per unit | $0.01/mL | not offered |
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Self-check
- Why pair aluminum with magnesium hydroxide?
Balance constipation against laxative effects. - When can both antacid cations accumulate dangerously?
Renal impairment.