How to take Vasotec. You may take Vasotec with or without food. 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. Your blood pressure will need to be checked often. Your kidney or liver function may also need to be tested.