Maalox is an antacid that reduces symptoms of high stomach acid. Maalox protects the lining of the esophagus, stomach and duodenum. Heartburn and esophageal reflux can be caused by changes in diet (acidic or spicy foods, alcohol, etc.) or certain medications (aspirin, anti-inflammatory drugs, etc.). To reduce your risk of symptoms, follow these guidelines as closely as possible: Avoid eating a lot of fatty foods with your meals. Avoid certain foods such as chocolate, spices, red peppers, fruit juices, and sodas. diversify your diet; keep weight low and do enough exercise; do not do heavy physical work after eating; do not smoke or drink too much alcohol.