Some medicines need to be taken "before food" or "on an empty stomach". This is because food and some drinks can affect the way these medicines work. For example, taking some medicines at the same time as eating may prevent your stomach and intestines absorbing the medicine, making it less effective. Alternatively, some foods can interact with your medicine, either by increasing or decreasing the amount of medicine in your blood to potentially dangerous levels, or levels that are too low to be effective. Some foods can neutralise the effect of certain medicines.