Alginic acid is a natural carbohydrate that comes from algae in seaweed (kelp) and is used in many processed foods. It helps this medication create a foam barrier to coat the stomach.

Aluminum and magnesium are minerals that occur naturally and are used as antacids.

The combination of alginic acid, aluminum hydroxide, and magnesium carbonate is used to treat symptoms of stomach ulcers, gastroesophageal reflux disease (GERD), and other conditions caused by excess stomach acid. This medicine is also used to treat heartburn, upset stomach, sour stomach, or acid indigestion.

This medication may be used for other purposes not listed in this medication guide.

Ask a doctor or pharmacist before taking this medication if you have kidney disease, kidney stones, severe constipation, or if you are dehydrated.

Avoid taking multivitamins, mineral supplements, or other medications (especially antacids) at the same time you take this medication. Antacids can make it harder for your body to absorb certain other drugs. Taking too many antacids together may cause you to take too much of a certain drug.

Call your doctor if your symptoms do not improve, or if they get worse while using this medication.

Stop taking this medication and call your doctor at once if you have severe stomach pain, severe constipation, swelling in your ankles or feet, blood in your stools, or if you cough up blood. Some of these may be symptoms of your condition and not side effects of the medication.

Ask a doctor or pharmacist if it is safe for you to take this medicine if you have:

• kidney disease, a history of kidney stones;

• severe constipation; or

• if you are dehydrated.

It is not known whether this medication will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication.

This medication may pass into breast milk and could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.