You can stir magnesium trisilicate into a small glass of water to dilute it before swallowing if you like.If you have been given tablets, check the label for the directions on how to take them, but as a guide it is usual to chew 1-2 tablets when required.Antacids are best taken to relieve your symptoms when they occur, or when you are expecting them to occur, such as after eating a large meal.