THE SIDE EFFECTS OF INGREDIENTS SODIUM BICARBONATE dangerous for people with high blood pressure. also, if taken daily for several weeks, people with poorly functioning kidneys may find their body fluids have changed to a higher alkaline pH. This can cause the formation of kidney stones or urinary tract infections. CALCIUM CARBONATE can cause constipation ALUMINUM HYDROXIDE may cause severe constipation MAGNESIUM HYDROXIDE laxative people with chronic kidney disease are recommended not to use medications with magnesium because they are less able to remove magnesium from their bodies. ADDITIVES TO ANTACIDS aspirin is sometimes added to treat headaches as well as stomach acid. However, some people find that aspirin upsets their stomachs caffeine is in some antacids. Caffeine will cause the stomach to secrete more acid