Final answer:
The magnesium-based antacids from the provided list are Milk of Magnesia and Gelusil. They contain magnesium hydroxide and are used to neutralize stomach acid but can cause a laxative effect.
Step-by-step explanation:
The magnesium-based antacids from the provided list are Milk of Magnesia and Gelusil. These antacids contain magnesium hydroxide, Mg(OH)2, which is useful for neutralizing stomach acid. Due to the presence of magnesium, these antacids can sometimes have a laxative effect.
Milk of Magnesia is a suspension of magnesium hydroxide and Gelusil is a combination of magnesium hydroxide and aluminum hydroxide. The two substances are often combined in antacids to balance their respective side effects, as aluminum hydroxide can cause constipation.
Learn more about Magnesium-based Antacids