How to take Trileptal. Shake the oral suspension (liquid) well just before you measure a dose. Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one. Give the liquid directly from the oral syringe, or mix the medicine with a small glass of water. After using the syringe, rinse it with water and allow it to air dry. You may take the oral liquid or regular tablet with or without food.