Use Simethicone (Gas-X) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.Use exactly as directed on the label, or as prescribed by your doctor. Do not take more of this medicine than directed. Simethicone works best if you take it after meals and at bedtime. You must chew the before you swallow it. chewable tablet Measure carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon). liquid medicine Simethicone liquid drops can be mixed with water, baby formula, or other liquids to make swallowing easier for an infant or child. You may need to follow a special diet or increase your exercise while using simethicone. Follow all instructions of your doctor or dietitian. Learn about the foods to eat or avoid to help control your condition. Always follow directions on the medicine label about giving simethicone to a child. Call your doctor if the child's gas symptoms do not improve after treatment with simethicone. Store at room temperature away from moisture, heat, and light. Do not allow the liquid form of this medicine to freeze.