How to Help Your Patients Find Aluminum Hydroxide/Magnesium Hydroxide in Stock: A Provider's Guide

Patients frequently ask their care teams about OTC medications they can't find at their pharmacy. Aluminum hydroxide/magnesium hydroxide antacids — sold historically under brand names like Maalox and Mylanta — have been particularly confusing for patients due to brand discontinuations and reformulations in recent years. This guide gives you the clinical background and practical talking points to help your patients navigate antacid availability in 2026.

Why Patients Are Confused About Antacid Availability

Two market events have driven most of the confusion your patients are likely reporting:

1. Maalox was discontinued in the U.S. Patients who used Maalox for years now can't find it and may not know that store-brand generics with identical active ingredients are therapeutic substitutes.
2. Mylanta availability is inconsistent. After a period of unavailability, Mylanta has returned to U.S. shelves but is not stocked at every pharmacy — leading patients to believe the product has been discontinued when it's simply not carried by their local store.

Counseling Points: How to Read the Drug Facts Label

The single most helpful thing you can teach patients is how to identify a therapeutically equivalent antacid by reading the drug facts label. Advise patients to look for:

• Active ingredients: "Aluminum hydroxide" and "magnesium hydroxide" listed under Active Ingredients
• Milligram amounts per dose: Regular strength = 200mg/200mg per 5mL; Maximum strength = 400mg/400mg per 5mL
• Optional simethicone: If the patient also needs gas relief, look for a product including 20mg or 40mg simethicone per 5mL

Any store-brand product matching these specifications is a therapeutic equivalent and can be recommended with confidence.

When to Recommend an Alternative Drug Class

If a patient can't find aluminum hydroxide/magnesium hydroxide and their symptoms warrant ongoing acid management, consider these alternatives based on symptom frequency and severity:

• Occasional heartburn (≤1x/week): Calcium carbonate (Tums) is an appropriate OTC switch. Easy to find, fast-acting, well-tolerated in most patients.
• Frequent heartburn (2-3x/week): Famotidine 10-20mg (Pepcid AC) OTC is preferred over continued antacid use. Lasts 8-12 hours; fewer drug interactions than cimetidine.
• GERD or refractory symptoms: Transition to OTC or prescription PPI (omeprazole 20mg, esomeprazole 20mg, or equivalent). Document appropriately; monitor for long-term PPI risks.

Key Contraindications to Communicate

Before recommending that a patient continue using or switch to aluminum hydroxide/magnesium hydroxide products, flag these high-risk situations:

• Renal impairment (eGFR <30): Risk of hypermagnesemia and aluminum toxicity; avoid or use with close monitoring
• Concurrent fluoroquinolone or tetracycline: Antacid significantly reduces antibiotic absorption; advise 2-hour separation or switch antacid class
• Levothyroxine users: Must separate antacid from thyroid medication by at least 4 hours to preserve absorption
• Pregnancy: Generally not recommended; counsel on safer alternatives and consult OB

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Where to Direct Patients Who Are Searching for Stock

For patients set on finding this specific formulation, advise them to:

• Check large chain pharmacies (CVS, Walgreens, Walmart) — they stock the broadest OTC selection
• Search pharmacy websites for in-store availability before driving over
• Order online through Amazon or a pharmacy delivery service if the immediate need allows for it

You can also refer patients to medfinder, a service that calls pharmacies on the patient's behalf to check stock and texts them the results — saving them from making multiple frustrating calls.

Documenting Antacid Recommendations

While OTC antacids don't typically require prescription documentation, if you're recommending antacid use for a specific clinical indication (ulcer, GERD adjunct, phosphate management in CKD) or advising a particular dose regimen, document this in the patient's problem list or medication list for medication reconciliation purposes. For more clinical background, see our provider shortage update article.