How to Check If a Pharmacy Has Aluminum Hydroxide/Magnesium Hydroxide in Stock (Without Calling)

Most people don't think about checking pharmacy inventory before heading out to buy an OTC product — you just go to the store. But if you've had the frustrating experience of driving to your pharmacy only to find the aluminum hydroxide/magnesium hydroxide suspension you need is out of stock, there's a smarter way.

Here's how to check pharmacy stock for aluminum hydroxide/magnesium hydroxide without making a phone call — and what to do when your nearby options come up empty.

Method 1: Use the CVS.com Website or App

CVS has one of the best OTC inventory lookup tools of any major pharmacy chain. On CVS.com or in the CVS app:

1. Search for "Mylanta" or "aluminum magnesium antacid"
2. Filter results by "In Store" and enter your ZIP code
3. Click on a specific product to see whether it's in stock at stores near you, or available for same-day delivery

Keep in mind: CVS.com inventory data is generally accurate but may lag by a few hours. If you're making a special trip, it's still worth calling the store to confirm.

Method 2: Check Walgreens.com

Walgreens.com also has in-store inventory lookup for OTC products. Search for the product name, select "Pickup" as your fulfillment method, and enter your location to see which nearby Walgreens locations carry the item and have it available. The "Same Day Pickup" filter is especially helpful when you need the antacid today.

Method 3: Walmart.com Inventory Check

Walmart.com offers strong in-store pickup inventory tools. Search for the antacid product and select "Pickup" to see if it's available for same-day store pickup at a Walmart near you. Walmart typically carries a wide variety of store-brand antacids, so if the specific formulation you want isn't available, an equivalent store brand likely is.

Method 4: Use medfinder — They Call Pharmacies for You

The easiest and most comprehensive approach is to use medfinder. You provide your medication name and location, and medfinder calls pharmacies near you to verify which ones have it in stock — then texts you the results. No hold music, no repeated explanations, no driving to empty shelves.

medfinder works for OTC medications just as well as prescription drugs, making it particularly helpful when you need a specific antacid formulation (like the liquid suspension) that isn't stocked everywhere.

39,049+ patients found their medications in stock

39K+

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Method 5: Search Amazon for Same-Day or Next-Day Delivery

If you have an Amazon Prime membership, aluminum hydroxide/magnesium hydroxide antacids may be available for same-day or next-day delivery to your address. Search Amazon for the product name and filter by "Prime." This is especially convenient if you're in a less populated area with fewer pharmacy options, or if you prefer the convenience of home delivery.

Tips for Finding the Right Formulation

When searching online or in store, keep these tips in mind:

• Search by active ingredient, not brand name ("aluminum magnesium antacid" catches more results than just "Mylanta")
• Know your strength: Regular (200mg/200mg per 5mL) vs. Maximum Strength (400mg/400mg per 5mL)
• Decide if you need simethicone (for gas relief too) and search specifically for products including it
• Store brands at CVS, Walgreens, Walmart, etc. with matching active ingredients are therapeutically equivalent

Skip the calls, skip the stress.

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What to Do If You Simply Can't Find It

If none of the above methods turn up the specific antacid you need, you have good alternatives available. See our guide on alternatives to aluminum hydroxide/magnesium hydroxide for options including calcium carbonate (Tums), famotidine (Pepcid), and omeprazole (Prilosec) that may work equally well for your symptoms.