What is the recommended dosage of Mylanta (aluminum hydroxide, magnesium hydroxide, and simethicone) for adults and children over 12 years old?

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Last updated: October 25, 2025View editorial policy

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Recommended Dosage of Mylanta for Adults and Children Over 12 Years Old

For adults and children over 12 years of age, the recommended dosage of Mylanta (aluminum hydroxide, magnesium hydroxide, and simethicone) is 30-60 mL (1-2 unit doses) per day, preferably at bedtime, in divided doses, or as directed by a doctor. 1

Dosage Information

  • The FDA-approved dosage for Mylanta for adults and children over 12 years of age is 30-60 mL (1-2 unit doses) per day 1
  • The medication should be shaken well before use to ensure proper distribution of active ingredients 1
  • A full glass (8 oz) of liquid should be consumed with each dose to enhance effectiveness 1
  • The maximum recommended daily dose should not be exceeded in a 24-hour period 1
  • Mylanta is not recommended for children under 12 years of age without consulting a doctor 1

Administration Guidelines

  • Doses may be taken once daily (preferably at bedtime) or divided throughout the day 1
  • For optimal effectiveness, Mylanta should be taken between meals and at bedtime 2
  • The medication works by neutralizing stomach acid, with onset of action typically faster with aluminum/magnesium hydroxide formulations compared to calcium carbonate alternatives 2

Clinical Considerations

  • Mylanta contains aluminum hydroxide and magnesium hydroxide in a specific ratio to balance the potential laxative effect of magnesium hydroxide with the potential constipating effect of aluminum hydroxide 3
  • The duration of action for aluminum/magnesium hydroxide formulations in the esophagus has been shown to be approximately 82 minutes, which is longer than calcium carbonate alternatives (60 minutes) 2
  • When used for gastric ulcers, Mylanta has shown effectiveness in symptom relief comparable to prescription medications like cimetidine, though healing rates may be lower 4

Safety Considerations

  • Long-term use of aluminum-containing antacids should be monitored, especially in patients with renal impairment, as aluminum accumulation can occur 5
  • Patients should be advised not to use Mylanta for more than two weeks without consulting a healthcare provider, as prolonged symptoms may indicate a more serious condition
  • Patients should be instructed to drink a full glass of water with each dose to enhance effectiveness and minimize potential side effects 1

Special Populations

  • For elderly patients, no specific dosage adjustment is recommended based on age alone, but caution may be warranted due to potential decreased renal function
  • Mylanta should not be used in children under 12 years without medical supervision 1

Remember to shake the bottle well before each use and to follow the dosing instructions precisely to ensure optimal effectiveness and safety.

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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