You can take an Erix 100mg Tablet with or without food. It must be taken exactly as prescribed by your physician. You should take about 1 hour before you plan to have sex. Although everyone has different working hours, most people take between thirty and an hour to complete their tasks. Only when you are sexually stimulated can this medication help you achieve an erection. However, if you do not have erectile dysfunction, you should not take this medication. You should only take it once every day.