Cenforce 100 mg tablet can be taken on an empty stomach or with a meal. It should be taken strictly as directed by your doctor. You should take about 1 hour before planning to have sex. The time needed to work varies from person to person, but typically ranges from 30 minutes to 1 hour. This medicine will only help you get an erection if you receive sexual stimulation. However, you should not take this medication if you do not suffer from erectile dysfunction. It should not be taken more than once a day.