Maalox Suspension contains two different medicines. They are called aluminium hydroxide and magnesium hydroxide. They belong to a group of medicines called antacids. Maalox Suspension is used for: Heartburn or when your stomach has too much acid (indigestion) Inflammation of the stomach (gastritis), and When prescribed by a doctor it may also be used for lowering the amount of acid in your stomach or gut (intestine) when you have an ulcer Maalox Suspension works by lowering the amount of acid in your stomach.